How To Fix Your Mustang's Overheating Problems... (Common Issue) 

I was battling an intermittent overheating issue with my 06 GT in 2018 and it took me 3 months to solve it. I replaced the thermostat, I removed the radiator and had it tested, replaced the radiator cap and replaced the cooling fan assembly with a new one from Ford but still had the issue. My old fan had a burned power wire going into the resistor but this plugin itself looked fine. My problem was in the BEC (power distribution box) in the engine bay. I loosened the 4 bolts in that box which then allowed the wiring harness connectors to drop out. The wiring pin for the high speed fan relay was burned up and had melted the connector housing and the terminal on the BEC was also burned. I got a salvage BEC with the wiring harness connectors attached to it and used the connector from it to repin my factory wiring into it. I used the unburned wire (green/violet) from the salvage connector and joined it to my wiring harness after cutting off the burned wire. I installed the new BEC and reconnected the new unburned connector and reassembled it all and after test driving it voila, problem solved!!! I spent so many hours trying to figure out my problem. I was about to replace the PCM when I checked this BEC. I had no codes and sometimes the fan worked but when driving it the fan would stop working and would no longer come on when I turned on the AC. There are other S197 mustangs online that had the exact same issue I had so there’s obviously some design defect here. I hope that my comments here might help somebody battling the same problem I had. The new fan assembly has a redesigned resistor so I think the old resistor design caused my problem. What I don’t understand though is why it burned up the wiring in the BEC and the green 40A cooling fan fuse did not blow. Makes no sense to me. This was the biggest mystery I ever had with a car!!

that switch came out p sick, strong work all around brother.

Good job. I like the process of elimination. I'm probably gonna do this to. And trust me every install ends up being 7hrs lol

Car looks great. I’ve got an 03 Mach and trying to decide what exhaust to run. I saw your video on the Borla S type. You still liking it? Trying to decide between it and the Atak

I just got a mustang and I have to do the exact same thing that you did in this video unless I want to manually connect it under the hood everytime I drive 😢 unless I can find a way to fix it but it seems to be Frankensteined already 😂 just bought it today can't wait to take a look tomorrow to see what all the problems besides that are lol

great video, will be doing the exact same to my 14. thank you so much for making this!

My favorite part about my SVT fan is when it turns on high it sounds like an airplane. That thing moves some serious air. When it’s on high you can feel it standing next to the car. My current problem now though is now my relays in the fuse box fried the plastic. I have no low speed fan. And my high speed fan is on its way out but Im gonna wire in some new hella relays instead.

mine burned out the low speed wire on the fusebox side, thankfully the fusebox pin wasn't damaged so I cut the wire off and soldered in a slightly thicker wire with the same connector since I had it laying around and that fixed it EDIT: 1 month later and it just burned out again, guess I'm going with the external switch now

How did you install the switch on the dash like that

Awesome. Thanks, Evan.

What if we use a gt stock fan for an eco boost 2016 ? Will it work the same or naw

I noticed i have the same melted spots as you in fuse box an i was going to wire it up like you did but with out the relay is the relay something you have to have? ive seen other videos an they just used the fuse and switch

Awesome,thanks for showing how you worked through the issues, the same ones we will come across, and how yo remedy them!

Is the fan running only one speed/high speed or is it operating like factory where you turn the ac on, or when it reaches a certain temperate it will turn on?

I have a 09 gt end my ac started to blow warm air thats when my car overheated does the fans cause your air conditioner not to work and overheat the car ?

NEW POST LETS GOOOO

broo ty have the exact same problem. gonna try to fix without a hard switch

Same thing happened to my 96 mustang gt. The thing got fried. I did literally THE same exact thing to combat this shitty wiring harness. It worked for like a week or two before it got all messed up and sparked up. It blew the fuse and made the wiring really hot whenever it worked.

How did you open up ur fusebox to get underneath I'm struggling with it

You can make a list of everything that needs to be purchased to do that job.

You can also hook your fan on low speed into your ignition and the fan will turn on when you turn your key to the on position I’ve done it on mine and had no issues ever since

Well im back a yr later to do the exact same thing u did. Havent driven the car is 9yrs cuz this over heating crap

I got the same problem the fan just turn on on high speed so the ac dosent wirk when im on a red right but just one question by doing that it turns on the high orvthe low speed if you turnvthe low manually what happend tivthe hight speed? Its on normally with the normal relay?

Instead of adding a switch at the dash ,let the factory wire control the positive voltage to the coil of the relay or in other cases it could be a ground ,that would have been simpler than using the toggle switch....!

Nice video man 😎👉🏼. My GT fan shit the bed like three days ago crisped up my block pin connector under the fuse box good to and now looking to copy what you did here atm but I just have a couple questions. After cutting off the bad resistor you think you could have just gotten away with reusing the old fan? Or would you still recommend getting a new fan? Guess people are saying the problem is almost always from that resister corroding so if. You just chop out the problem then maybe you could get away with it in theory 🤔 but I don’t really know, could also be the motor in the fan to I’m going to I guess Also just wondering do you just roll around with your fan running at all times? Or are you constantly flipping it all the time to keep it in that cozy temp spot for the block

The real common issue is the fuse go out and the fan doesn’t come on which cause your car to over heat I learn that after a mechanic told me i needed a new fan 🤦🏾‍♂️

You should get the service manual for your car.

Damn, this seems to be a common problem. How can i prevent it with my 06? I've only got 60k miles and so far haven't run into this problem. maybe getting the gt500 fan before i have a problem is a worth while investment. Nice steering wheel. i put a momo on mine and get lots of hate from the safety Nazis. i grew up driving without airbags.

Hey bro at u sitting on 19s?

How did you connect the switch?

Thank you!!!!!

AYO THATS SOME BIG BOY STUFF RIGHT THERE

15:38 that’s me

Universal Rule of thumb: Multiply the estimated install time x 10 to get actual install time.

That thing could freeze rubbing alcohol

Currently having this issue wish I would have seen this video $800 dollars earlier 😂

Basically everything I’ve bought from American muscle has gone bad with in a year

Bruh that fan was acting like a mouse but it changed its mind and started acting like a man

How to fix heating in mustang? Step-1- own a mustang

AYE I FOUND OUT IT WAS A BLOWN FUZE

This dude is like Magiver of Mustangs dealing with fixing radiator fans and wiring now that wiring is difficult Shit….I’m so sick of these old Ass 05-09 mustang GTs ….All they do is tear up always something with a shit mop bucket Mustang Gt ….Used cars in general are money 💵 pits ugh