Jeep JK - No Heat / Temp Gauge Going Up & Down / Fan Running - FIX for one or all symptoms 

😂True

My brother works in Hvac and he calls it "the illusive one."

We won't be using your videos anymore

Please don’t waste your time and money. Shit vehicles

By turning it up full blast you remove the heat quicker from the engine bay which in turn allows your HVAC to work at it's maximum.

If the sensors are all still good and transmitting, then just have the tire size relearned at a shop.

Get JScan and you can change the tire sensor perimeters or even completely turn off the TPMS. You can also re do your tire size while you are at it so your speedometer is correct and your shift points are where they are supposed to be

Same here, it started doing that right after I changer the fan censor

Any suggestions would be greatly appreciated!

Same

Up and down temps means your coolant level is low. The air in the system heats up and when the coolant makes it through, it cools back down. You have to burp the system to get the air out. There are many ways - but the easiest and cheapest is to park your vehicle with the nose uphill. You want the radiator cap higher than the rest of the system. When cool - top off the coolant. Run it some more and get it warm again. Let it cool with the nose up again. Top off the coolant. The air will typically always go to the highest point - so use that to help get all the air out.

@@oscarwinner2034 thanks bro! My reservoir tank appeared full so I didn’t think that was it, after reading your comment my radiator took almost 3/4 of a gallon of fluid. Thanks

I did the same and its doing this. Maybe the sensor needs changes too

@@g-trooperg5876 u fix it.. i changed both an mine still going up an down

My jeep is doing the same thing. Coolant goes into the overflow bottle but doesn’t suck back out Into the radiator.

@@ronfrieborn2276 mine does the same new water pump ,radiator ,radios cap ,thermostat,should I change sensor ?I aslo purged it got bubbles out ,only good for about a week then does back to do the same goes to hot then goes back down after 30 seconds and then after that it’s fine ?any solution ?

Hello dear, have u fixed it? if yes, can u please share you solution

Check that coolant purge screw on top of the thermostat (under the intake) first off and make sure it has an O ring on it. If you can’t get to it easy, you can always look at it while it’s running to see if it’s leaking there. It seems to be the culprit for most pentastar engine problems cause it’s cheap, plastic, and sometimes the O ring is missing or broke. If it’s not that the coolant temperature sensor is worth a shot cause that one is super cheap. Best of luck man!

I had a hard time finding my coolent leak since it was coming out of the back side of my engine. I ended up replacing my oil filter/cooler housing and got the leaking to go away. There are some good videos on that replacement online if you are willing to save some money.

Did you end up fixing this? Your comment is the same exact thing I'm having issues with.

Oil cooler under the intake. Plastic ones were defective. They have remanufactured them now to be better. If you’re leaking from the transmission bell housing to the bottom middle of the undercarriage…that should be your culprit.

@@mikemike7397 7:19 I had the same problem if you look down below your oil filter on top of the motor if it looks like oil under there definitely is a problem I replaced my oil cooler or oil filter housing with upgraded aluminum housing to find out that that wasn’t my overheating problem, I still had the same problem I put in three different aftermarket thermostats which are also cheap and not good. I took the one thermostat and readjusted the spring and it actually worked better. And maintain a steady temperature and I was good for the night but the next morning he started doing the same thing again I’ve flushed the radiator and bled the system for 15 minutes through the bleeder screw It looks like thermostat is opening and closing according to the temperature gauges but it fluctuates back-and-forth in between different temperatures going to buy a temperature sensor and a new Mopar thermostat. The top radiator. Hose is really hot bottom hose is cold and radiator is also cold to touch. Radiator is building pressure if I release the pressure out of my cap just a slight, turn then the temp gauge goes back down after running for a couple hours I was told a head gasket, which I’m not ruling out my instincts tell me something else!!!

How are things after replacing sensor? So far we have done cap, thermostat and about to buy a new radiator. Sensor would be much cheaper lol.

I think the temp sensor should be fine unless it starts randomly going up and down while the car is warmed up and been running… big thing to check is purging the new coolant your system got. It’s a super common problem, that air gets stuck in there and causes the system to go haywire. It’s super easy and free. If you have the 3.6L I purged mine in this video… you’ll hear it hissing out of there - if it had an air pocket. Best of luck, take care!

@BrianEaly thanks Brian I'll have to do that I just follow like you did take the cap off the thermostat and leave it off and fill it up? I'll watch it again I really appreciate the reply. Helps alot

Odds are it’s one of the three + 1. First check the coolant level. (That’s free and the +1) Then try purging the coolant system… that’s in the video of how to do, that’s free, and super common in the 3.6 motor. (Usually the problem). Air in the system screws up the sensor and makes it go all over the place. If not those it’s either the thermostat, or the coolant temp sensor, sounds like the coolant temp sensor if the heat is still blowing. Hope you get her fixed. Best of luck.

Same. I take mine in on Monday. Mind letting us know what they tell you?

My fan seems to run hard a lot, and temp goes up under a strain on interstate. Could this be my issue also? Radiator and thermostat have been replaced. Only happens on warm days. Drove to Virginia from Georgia during winter with no issues.

I agree lol

Mine was doing the same. Completely drained, flushed and refilled it. So far, no problems