How to Rewire Power Through Ignition Switch in Your Car

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Electrical troubleshooting. How to rewire power through the ignition switch in your car, DIY with Scotty Kilmer. How to rewire a car. How to rewire electrical power in your car to devices that have lost power, electrical tricks and tips. Using the ignition switch power wire and a toggle switch, many expensive devices can be rewired to bypass insanely expensive computer driven systems. DIY car repair with Scotty Kilmer, an auto mechanic for the last 43 years.
⬇️Things used in this video:
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3. Circuit Tester: amzn.to/2CJq2Ah
4. Quick Splice: amzn.to/2AYGjnw
5. Pliers Set: amzn.to/2Ax5VXe
6. Wire: amzn.to/2BzvRCt
7. In Line Fuse: amzn.to/2jc0R0L
8. Flashlight: amzn.to/2kwtiu3
9. Mechanic’s Tool Set: amzn.to/2Bzmccg
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21 окт 2024

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Комментарии : 330

@scottykilmer 6 лет назад

⬇️Things used in this video: 1. Toggle Switch: amzn.to/2B0HSBF 2. Screwdriver set: amzn.to/2jaHIfP 3. Circuit Tester: amzn.to/2CJq2Ah 4. Quick Splice: amzn.to/2AYGjnw 5. Pliers Set: amzn.to/2Ax5VXe 6. Wire: amzn.to/2BzvRCt 7. In Line Fuse: amzn.to/2jc0R0L 8. Flashlight: amzn.to/2kwtiu3 9. Mechanic’s Tool Set: amzn.to/2Bzmccg 10. Disposable Gloves: amzn.to/2zSRuxO 11. Common Sense 12. Full HD Camera: amzn.to/2AvoEk7 13. My computer for editing / uploading: amzn.to/2i2sKYz 14. Video editing software: amzn.to/2jv5Fhf 15. Thumbnail software: amzn.to/2k7tz6C 🛠Check out my Garage to see what I use every day and highly recommend: www.amazon.com/shop/scottykilmer ❗️Check out the Scotty store: goo.gl/RwhRGU 👉Follow me on Instagram for the latest news, funnies, and exclusive info / pics: goo.gl/ohy2cA

@secretninjawarrior 5 лет назад

Scotty, I really like all your videos except this one. It really disappoints me because the splices you use are not the proper or reliable methods for auto electrical wiring. Wire nuts are not suitable for cars because of vibration and weather. Fuse is safe, but not the use of wire nuts. No mention of the switch or wiring ratings either. This is not safe.....Thanks for other video tho.....

@ChrisMichaelsChicago 3 года назад

@@secretninjawarrior Yup those clips suck! I solder and shrink wrap everything! Also use a clamp on meter to measure amp draw, now we have the correct gauge and switch rating to use., as well as the correct value fuse.You're point is completely valid.

@nicolemorin6795 3 года назад

I have a question my PT Cruiser is not turning over for some reason when I try to turn the ignition switch on it will not turn over you won't even hear it prank and I got a constant red flashing Circle it started at first and then it just shut off and then all won't start up at all I just didn't turn it on and I see the power's on but it won't start a crank you won't hear it kill over at all

@reecerandall918 2 года назад

I always go through a relay when running to fans or a clutch. It's too easy to melt the wires if you dont. Plus I go to a empty port on the fuse box to keep from damaging any wires on the vehicle. "Easy and removable without damaging any of the factory installed equipment."

@williamfry6087 Год назад

I love "Rev up your Engines". And you are still a dangerous man Scotty

@MrIMacro 6 лет назад

i like how you prepare your sentences and make them short and informative to make use of your time and your viewer's time. Thanks a lot.

@VitalityMassage 8 лет назад

Thanks Scott. I hooked up a Stinger battery isolator in my Corolla using this method. Worked perfectly. I even used the same wire you used.

@johntormey8169 4 года назад

Top man Scotty, so good to see you wont be beaten by any tech issue that car manufacturers implant into their computer system that either costs loads of money and hassle to fix or evenend up scrapping the car. Great Work!!

@briansmobile1 13 лет назад

I like the way you made the video to give people options. You're good about doing that.

@scottykilmer 11 лет назад

yes, as long as the power intake isn't much. If it is, you must use relays in that wiring system to prevent blowing fuses. A relay takes the power from the battery and sends it to the device WHEN it's powered up by key power in that case

@scottykilmer 13 лет назад

@swiften Only for low gauge wires, this is a 14 gauge wire that can handle the power. And yes, as an example, on a late model Chrysler car you can't do this as the switch wires are small gauge computer wires that couldn't take that power. Good point., scotty

@AL6S00740 12 лет назад

Roger that thanks for the relay, but what about the water resistant connectors and connecting the wires by soldering them ..? Is this strictly required ?

@scottykilmer 11 лет назад

check the wiring for shorts, which can be a pain. OR , just rewire power to both devices directly from the battery using wire and in line fuses.

@scottykilmer 13 лет назад

@380gb Sure, I do that all the time, but this customer kept forgetting to turn the switch off and drained his battery. So I wired it to the ignition switch so the battery won't drain if he left the switch on. Scotty

@reacher8360 4 года назад

Okay so I won't need the toggle switch if it's connected directly to the ignition switch?

@r.joseph8911 6 лет назад

Scotty, you're the best. Tellin it like it IS man. That's what we need!

@scottykilmer 13 лет назад

@ALEX62592 you can rewire them, but Don't use the ignition switch, fogs use too much power. Wire it directly from the battery and also use a power relay to run them,most fog kits come with one. scotty

@scottykilmer 13 лет назад

@jmihalchik I've already answered this in an earlier post here. Basically this is to show how to rewire power, for a full AC rewiring watch my other video "How to fix your car's AC system cheaply." Scotty

@scottykilmer 12 лет назад

you can put a switch in to turn it on and off manually if you want.

@scottykilmer 13 лет назад

@TheSuprahunter for a thermo fan that uses lots of power, I advise wiring it directly from the battery using a toggle switch and a relay to power it. I would not use the ignition switch for that. Scotty

@christinemedranovaa2108 6 лет назад

Scotty Kilmer Hi scotty Kilmer, My 2000 crown victoria side marker turn signal lights does not working. I bought a universal flasher and it works on my blinkers only the one is next to my front headlights. Pls I needs some helps. Or did i hook up the flasher wrong?

@jimisback 13 лет назад

Sometimes resoldering cold joints on the computer can fix many things. Vibration and heat wreak havoc on them sometimes. Good Video Scotty, I may use this method for a fix. Thanks for all your videos. I have my nephew watch them all, so he can learn.

@scottykilmer 11 лет назад

depends on the vehicle. Some like GMs with passlocks need reprogramming so they will work, they are not just bolt on and run systems.

@scottykilmer 13 лет назад

@jose01ification generally either a short in the wiring going to the dash, a problem in the dash circuit boards, or a blown fuse. Start with the fuses. Scotty

@fixinggrace 13 лет назад

Computers have made our lives easier in may ways, but trying to fix them on a car worth a couple grand doesn't always make a lot of sense. I like the way you think outside the box to get things fixed Scotty. No gain in sweltering in the heat because you can't afford to fix a computer.

@scottykilmer 13 лет назад

@7477238 You can make it cycle on and off it you want, by hooking it up to a thermistor sensor, as I show in another video of mine"How to fix your car's Ac cheaply." I made this video mainly to show how you can rewire devices in your car, not mainly for an AC repair. My other video is more for that. Scotty

@scottykilmer 13 лет назад

@moofushu Well, to install off road lights, you would wire directly off the battery, not off the ignition switch, as they use a lot of power, You would also have to install a relay for them too. Scotty

@scottykilmer 13 лет назад

@MonaLisaKRk But of course, if yours is broken, often junk yard ones are too. I rarely use junk computers, everytime I've tried, they were bad. Scotty

@rontiemens2553 10 лет назад

Scotty, as I understand it, putting a toggle switch on the blower in this way will give you a choice between ful blast and off. Instead of a toggle switch, can you subsitutue a rheostat so you can get blower settings between full and off?

@SPEEDING_LEMONS 3 года назад

Always nice to see Scotty

@scottykilmer 13 лет назад

@TheLocalNut Yes, a system with problems like yours needs to be analyzed further in the AC system. In the case of my video, the compressor was brand new and the system pressures were fine. So hot wiring it was no biggie. Anytime you mess with AC, always hook up gauges to see what the pressures are, and if they are wrong, you have to fix that first. Scotty

@scottykilmer 11 лет назад

sure can be on one of those, but can be tons of things. Try my video "fixing a car that cranks but doesn't start up"

@Dingolfing 6 лет назад

Hello Scotty,, love and respect your work and advice and have spent hours watching them, being a petrol head and amateur mechanic myself. Unfortunately, I think this video is the most questionable one I have seen though. I like the idea of showing people how to wire things via the ignition switch, but with this particular example, your method is bypassing the safety switches (low and high pressure) on the system. Therefore if the TEV gets blocked, the AC system pipework or something could blow up or if the system runs low on gas due to a leak, as frequently happens, the compressor will likely lunch itself and blow up because these vital safety systems have now been bypassed and made totally redundant. Not trying to have a go, just think that on this video, this should have been mentioned as a caveat for others so they understand what they are doing in getting the AC system to run in this way. Matt.

@panzerveps 13 лет назад

I'd get ignition power from the fuse box instead. a lot easier and looks better ;) i work mainly with german cars (audi, vw), and the ignition wires are sooo tiny i'm always afraid of ruining them :P nice guide, as always!

@jamesphillips2420 6 лет назад

Nice! I was looking how to get to my ignition wire for a while and luckily you have a Toyota!

@scottykilmer 13 лет назад

@shotox21 check the brake pads first to see if they are low. If not, try adjusting the cables tighter. Scotty

@elchicoboy 12 лет назад

@scottykilmer I wish I had a mechanic as good as you near me so I can trust when it comes to fixing the car and trusting someone that won't rip me off.

@scottykilmer 12 лет назад

there are tons of relays under the dash and it's a cow taking it apart on that model. Try getting your head and ears under there to find the source, but realize it's not easy. it can even be the blend doors on the ac system moving back into place. Me, I'd live with it. Fords make noises as they age

@scottykilmer 13 лет назад

@DursosZeroPred As I've said in another response, this video's purpose is in the title, mainly about how to rewire power to a system that lost power. If you want an indepth Ac rewire video, watch my older video "Repair your own car's air conditioner cheaply" it shows the whole process. Scotty

@notmycupotea 13 лет назад

Neat fix I was thinking the same think since I have the same problem with my 04 civic, but I heard that the compressor cycles on and off when you drive the car (as necessary on hills, acceleration, high pressure, high tem etc) I was a little worried about the potential for damaging the ac system/parts, aren't there saftey switches that would be bypassed by doing this...switches that monitor the temp and pressure in the system?

@scottykilmer 13 лет назад

@jeffzaragoza You can, but you'd need to use a relay too, cause the ignition switch isn't strong enough to run that much amps which those fans use. Scotty

@scottykilmer 11 лет назад

often a bad BCM module does that, have a mechanic check that out, they are very complex

@jreeves2593 7 лет назад

Scotty Kilmer. can I help me with a Chevy s10 problem from hell??

@scottykilmer 12 лет назад

@maxazillion83 many things can cause that, from a bad starter to bad wiring to a weak battery and on and on. But your description of the problem is rather muddled, If I assume you mean the engine cranks over and spins, but does not start, yes, try pumping it. Old cars often need extra gas as they age to start up

@iguesi 7 лет назад

Thanks Scotty! I wanted to hook up an accessory that comes on with the ignition. This is the answer.

@scottykilmer 13 лет назад

@Matthew55904 NO, they would have to be wired for that and the computer would have to be set up for that. Scotty

@scottykilmer 13 лет назад

@crombieposterboy they didn't recall the highlander, which I was working on. Recalls often do not cover many problems, just the one's they were forced to do by law. Scotty

@pendulumx 13 лет назад

Good and interesting video, my only thoughts are, that the owner must be careful to make sure the aircon is off before turning the ignition on, as the extra load will burn out the ignition switch contacts quite soon? I think of this as my old car was known for having weak ignition switch contacts and if people turned the ignition on with the normal heater on the switch wouldn't last long

@moofushu 13 лет назад

Scotty are car's computers still expensive from the junk yard? I don't have this problem, but I think this video might help me install off road lights on my truck. I was kinda of scared to do it because I didn't want to cause any fires. Thanks scotty.

@scottykilmer 11 лет назад

just run power from the battery positive terminal to the switch, then the switch to the headlights and put a 30 amp in line fuse on the wire.

@iirmantass3 12 лет назад

True on that, but those quick splices sometimes may do some sorts of crazy stuff, for example, no connection on there. so solder may save the day. :)

@lairdwd 13 лет назад

Scotty - next time you do a distributor, can you put that up as a video? Thanks so much.

@STRUMMERBOY1975 2 года назад

Hi Scotty ! Great Video ! And hey I need your help !! I replaced the two batteries in my Ford 2006 F150... and now when I turn the key.. nothing happens.... no dash lights no dingaling sound ..no crank.. Nothin !! Elecrric door locks work but no electric windows no ceiling light... ... The ignition switch was faulty so the previous owner wire in a push button switch.... and that worked fine before ...

@scottykilmer 13 лет назад

@saqiblookingood in this case the compressor is already grounded, but if you're doing something that needs grounding, just send a wire from the ground device to any metal part on the car. Scotty

@scottykilmer 13 лет назад

@MattTrevett Ac clutches don't use much power. A 16 gauge wire is fine. Scotty

@s0nnyburnett 13 лет назад

This was an interesting fix, I wouldn't have thought to do that.

@scottykilmer 12 лет назад

only if the wire is where it gets wet all the time, like on an ABS sensor

@uzaiyaro 13 лет назад

If it's a computer problem that's affecting the air con clutch, there's a possibility it could affect other stuff too later on. If you're brave enough, what I'd be doing is checking in the computer for any busted caps (common in old cars), or reflashing the ROM using the JTAG on the circuit board (99% of embedded computers have JTAGs for this purpose). Nice quick fix though. Cheers.

@SinBeatz1 13 лет назад

awesome vid scotty!! Great way to get out of jams...have a battery relay need to hook up ignition to but wasnt sure how to find or splice it thanks!!

@jeffzaragoza 13 лет назад

Hi Scotty, I have 2 aux.fans for my radiator and i'm wondering if is it much better if i wire directly the other fan to the ignition switch so when the engine starts, fan starts too so the engine will stay cool?

@100bml 3 года назад

Thanks for a great video. I had asked you about my son's 2005 Accord a couple of days ago, and you mentioned being able to wire power to the AC compressor directly - it looks like this is what you meant. I have just 1 question. Do you still turn on the original AC switch when you run the AC along with the toggle switch or do you run the AC using only the toggle switch?

@Mr.Safety. 2 года назад

Toggle turns it on, then the regular switches can make it do what you want

@38911bytefree 12 лет назад

Aircons are pretty complex, not only turning on the clutch. But many times the clutch disengages and then engages, because there is not enough gas, because it has reach the target temperature, or ti's turned of temporaly by the main ECU if it notices that you need extra power (judging by the your behavior at the gas pedal). Some airocons hace sensors EVERYWHERE, to sense excesive frost in the evap ... Pretty complex stuff in some cases

@crateandbarrels 10 лет назад

Scotty, how can I do something similar to power a dash cam? Both of my cigarette plugs have power even when the car is off, but I want it only to come on when the car is running. I'm trying to plan out a wiring diagram and don't know what the best way to do this is

@scottykilmer 10 лет назад

sure, wire it off the ignition wire that gets power when you turn it on. And send me any funny videos if you see any while driving, I love that stuff

@scottykilmer 13 лет назад

@peakoil79 No, that's fine for tail lights. they don't have to match.

@happy543210 13 лет назад

I had a 1992 Mitsubishi Eclipse with a bad computer. I took it out, opened it up and found a blown capacitor and a couple of resistors. I bought the parts at radio shack for about 2 dollars and fixed a thousand dollar ECM.

@vanepico 13 лет назад

you should see our ford galaxy, both the window motor switches failed so we have an on off on switch on each of them connected directly to the motor :)

@mystiqueman366 13 лет назад

Now how will the clutch cycle if the clutch is getting constant power? Don't most a/c compressors cycle on and off to control pressure and prevent evaporator freeze-up?

@heroknaderi 3 года назад

Wow that’s an amazing idea 💡 I appreciate your time 🤩🤩😁😯😎

@Greenfire2200 13 лет назад

Scotty, I've always been under the impression that twist connectors (commonly used in home wiring) are prone to coming loose from vibrations and could possibly ground out on something causing a short in the system. I generally use butt splces or solder splices with shrink tubing for single wire connections. Why did you decide to use twist connectors for this project?

@Mr.Safety. 2 года назад

Still waiting for Scott to reply eh

@jimmymorgan5738 2 года назад

In programming a new ignition switch in a 2002 Chevy Tahoe can a blown fuse keep it from being programmed

@thewichaklan1 11 лет назад

Thank you.. So if I check the wires I have to do them one by one from to the wires in the back of the stereos? And once I find the wire how can I fix the problem thanks!

@scottykilmer 12 лет назад

Sure, you can't wire heavy amp stuff on there, I was showing a pretty low amp useage here. For that, you could use the ignition switch, but you would have to wire a relay in line to actually power the device. Pretty simple to do though

@scottykilmer 13 лет назад

@jnguyen1357 20 amp fuse is fine. AC clutches don't use much power, you'd use a relay for things like power windows and blower motors. Scotty

@IKhanNot 13 лет назад

Scotty won't the compressor spin too fast now. For example I'm sure the compressor shuts off via computer after the engine reaches a certain RPM due to overtaking on the highway. How will it cycle on and off?

@MattTrevett 13 лет назад

How can you tell if the wire you're using is able to carry enough current for the air conditioner compressor?

@scottykilmer 12 лет назад

@Darthlightning It should, I do that all the time with customers that have little cash.

@hectitoelunico9311 9 лет назад

Just what I was looking for.

@scottykilmer 9 лет назад

If you like my car help, be sure to watch my live car talk show every Saturday morning at 10 AM CST on RU-vid. I answer your car questions LIVE there. Just check it out at ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VognjkYaMjg.html&feature=c4-overview . And remember, every TUESDAY I upload a new video on the scotty kilmer channel on RU-vid, ru-vid.com , so don’t miss them.

@tracyteresi9382 4 года назад

HI SCOTT, WOULD A FAULTY IGNITION SWITCH MAKE A CAR RUN LESS SMOOTH? OR DOES IT JUST COMPLETE A CIRCUIT TO THE STARTER ONLY TO START THE STARTER MOTOR? THE REASON I ASK IS I JUST REPLACED MY IGNITION SWITCH IN MY 2002 HONDA CIVIC, STARTS UP FINE NO MORE BUZZING NOISE, BUT I THINK I'M NOTICING VERY SLIGHT ROUGHNESS, BUT I THINK I NOTICED IT RUNNING A LITTLE ROUGH BEFORE I REPLACED SWITCH. COULD A NEW IGNITION SWITCH AFFECT THE FIRING OF THE ENGINE?

@scottykilmer 13 лет назад

@Greenfire2200 Cause I always use them, that's a bunch of nonsense if you put them on tight. I've been using em for over forty years. If they are in a wet environment, I will seal them with silcone squeezed into them. Scotty

@scottykilmer 12 лет назад

@hyerxmas too much power drain then, you need to find out why it's draining so much power.

@scottykilmer 13 лет назад

@ranacherian Of course you should always use ac gauges when working on ac systems. But here I'm showing how to bypass an electronic computer Ac problem. Soctty

@Liamautomechanic 13 лет назад

good tip there scotty. is that a VVTI engine on that toyota. also nice car on the intro.

@swiften 13 лет назад

Scotty, isnt there a danger of overloading the circuit when adding devices to wiring?

@joeweatherly6881 2 года назад

Scotty got trouble with a 2002 Buick LeSabre custom 3800.i think it's the ignition switch on the electric side I wiggle the key and it died one time the cd stoped working. And I've replaced the ignition under the 3 coils one time, it will start to miss driving up the road and die then it will not even crank over it will try but after it sits a while it will start up and drive a ways and die again. What do you think ? Please help if you can.

@TheSuprahunter 13 лет назад

can i do this with a thermo fan? i know that it uses a lot of power so i dont know if i can run the fan at full power from a wire in the dash or will i have to hunt around with a multimeter

@scottykilmer 13 лет назад

@unboxingguru1 that particular asylum is a bar in alaska. Scotty

@scottykilmer 11 лет назад

something's bad in the wiring power to the blower then, me, I'd just leave it alone and use a toggle switch to run the blower full speed. Taking that dash apart is a pain

@spanmarx 6 лет назад

great video scotty

@scottykilmer 13 лет назад

@sexyspacemonkey either he's getting REALLY cheap starters, OR the flywheel has a problem and the starter doesn't mesh right and breaks from spinning crooked. Scotty

@eyeyamsofakingwetodd-id4264 5 лет назад

Have you already gone over how to bypass an ignition? My vw jetta key wont turn far enough to crank. And yes I have tried EVERYTHING its stuck. I just want to route the battery to the starter so I can drive it to the mechanics. Is this possible?

@halocop159 12 лет назад

thank you, i will try and find the source, thank you for your help

@scottykilmer 13 лет назад

@lodhimudasar Not as easy as you may think, most controls are in the dash requiring taking it apart, a GIANT job in many cars, some taking 5 hours of work. then if you find it's a 500 dollar computer, there goes the farm. Scotty

@jessestienbarger868 2 года назад

Got one for you 2002 gmc sierra 6.0 the passlock is faulty resistor mod does not do the job i need to figure out how to cut out the antitheft and power the system but i don't want to start chopping wires i know there away to power up fuel injection pulse etc with out too much hassle but all data is serial data its more complex whats your take on doing away with the system so key on like you could with an old z71

@scottykilmer 13 лет назад

@toyota4life94 It still leaves a VERY complex computer driven AC system. I like simplicity, and most do it yourselfers aren't going to be taking ac control units apart and fix them. Scotty

@Mr.Safety. 2 года назад

Why not run a solid wire from ignition switch to toggle, then the other toggle wire to the 30 Amp fuse breaker, then to the ac pump?

@smolanchad 5 лет назад

Scotty help! How would a guy bypass the ignition switch on a 2000 caravan? Toggle switch for the on position and a push switch for the starter.

@AL6S00740 12 лет назад

Scotty that about the amperage? Why you don't mention it ? Can it be a factor of burning things ? Because you can burn the contacts of the ignition switch if the amperage is very high also the wires for the Ignition Switch where very thin so the first think came in my mind was " what about the amps ?? so no one can burn any thing in his car and also we should use water resistant connectors after we pass the firewall of the car is this correct ? so that no wire is corroded ?? Alex !

@scottykilmer 12 лет назад

sure if it's an older car. Newer ones use the computer to power the starter and doing that would melt the cheap computer ignition switch such cars use

@scottykilmer 13 лет назад

@Liamautomechanic yes, they all use that these days. Scotty

@scottykilmer 13 лет назад

@mystiqueman366 You can wire the power through a cycling switch if you want, I show how to do that in my older video "How to fix your car's Ac cheaply." Here in Texas it's soo hot, freezing up is not a problem in the hot summer. Scotty

@lodhimudasar 13 лет назад

Anywayz i like the sentence writen on your t-shrit "live free or die" lol keep it up my grand teacher Scotty

@n1ghtblur 9 лет назад

Scotty, doesn't running the compressor constantly cause problems? I'm going to need to get my AC to run without my computer since I'm getting rid of my stock computer. Although, I could try to get the arduino (which is working kinda as a body control module) to run the AC.

@abandonthisfate2461 8 лет назад

+Samuel Thomas the switch turns it on or off it isn't constantly on

@scottykilmer 13 лет назад

@uzaiyaro I know how, the average joe does not, and they would never be able to do such a job and figure out which one was bad. I made these vids for average do it yourselfers, not pros. Scotty

@scottykilmer 13 лет назад

@Matthew55904 You would do what I do in the video, PLUS add a relay to the lights. that way the ignition powers only the relay switch, which is very little power drain. Scotty

@380gb 13 лет назад

I did something similar with a cooling fan on my 92 beretta. except i didn't run it through the ignition switch. i ran it directly off of the battery. and mounted a toggle switch in my dash. so as i was driving down the road i could just flip the switch.

@halocop159 12 лет назад

i have a question, i have a 2001 crown victoria lx and whenever i shut the air off for my car, there is a high pitch audible noise coming underneath my dash, do you have any idea how to make that stop,i hope you can answer this or know what it is, thank you