No Fan/over Heating Issue!!

EGULL64 · Aug 20, 2014

is on a 95 gt 5..0
Can't determine why the FAN won't come on.
About a week and a half ago the car overheated and cracked the radiator. NO I WASN'T DRIVING so I have no idea as to what happened.

Here's what's new: Rad, rad cap16psi, stat 180 degrees. NO LEAKS

Here is what I've checked:
1) Fan works on both speeds when connected directly to battery.
2) checked all fuses both engine & inside drivers side (all good)
3) checked fan connection for any melting or loose wires
4) took off ect connector & started car (FAN DIDN'T COME ON)
5) checked to see if ect cap was getting voltage with car off & running (NONE WAS FOUND) also checked wire to see if damaged...but they looked good
6) Turned on AC fan didn't come on. But I know the AC is not charged. I don't use it so I'm Not sure if that matters as to why it wouldn't come on (being low on refrigerant).

As of Monday it was still running hot-getting all the way past the L by the next line so I shut it off and did all the above mentioned checks.

Since then I started to check the CCRM.....problem is I don't have pins 5,6, & 16 on the harness side. And the guide I was following said I need pin 6....here is a link to the page https://sites.google.com/site/sn95mustangs/tech-info/94-95-ccrm

Also called a ford dealership in regards to the missing pins and a mechanic said that ford sometimes didn't use all the pins, so now I'm really confused....lol

PLEASE HELP IF YOU CAN!!

ronstang94 · Aug 20, 2014

There are supposed to be 3 pins missing (pins 9, 19, and 20). I believe you may be confusing these pins with pins 5, 6, and 16.

Check out this diagram
http://ww2.justanswer.com/uploads/wmarti7/2010-08-20_104005_94_mustang7.gif

As for the fan, it sounds like you have checked a lot of things and are on the right path. Just keep tracing the wiring back until you find the problem. Good luck.

EGULL64 · Aug 20, 2014

thanks ronstang94 I was following hissin50 diagrams. Makes much more sense now. Do you know if the engine needs to be hot ?

Here's what is was following for the fan relay:https://sites.google.com/site/sn95mustangs/tech-info/94-95-ccrm

ronstang94 · Aug 21, 2014

if you look at the ccrm a/c diagram, you will find the electric cooling fan motor near the bottom with some notes just to the left discussing when the fan should be on (engine temp, a/c clutch engaged).

So the engine has to be up to a certain temperature, or the a/c clutch needs to be engaged (but if there is not enough freon in the system the clutch will probably not engage, there is a sensor on top of the evap canister which does not allow the a/c clutch to engage if the freon pressure is too high or too low). So you need to either drive around the neighborhood and get the engine hot (with no fan in the summer this shouldn't take long), or fix any leaks and put another can or 2 of freon in the car to get the a/c working so you can diagnose the fan problem.

EGULL64 · Aug 21, 2014

Just got the car up to running temp....no fan came on

toyman · Aug 24, 2014

Depending on the source the low fan won't come on until 210 - 220*F and high fan at about 230*. I had a situation similar to yours ( except the low fan only would come on). I could force the fans (high and low) to come on by supplying power directly to the fan motor connector. CCRM was good. Turns out there was an internal short in the fan motor wiring. Replacing the fan motor resolved the issue with both fan working within their assigned parameters.

Chythar · Aug 24, 2014

Did you run the KOEO and KOER tests? I believe the KOEO (Key On Engine Off) test will attempt to turn the fan on to both high and low. If the fan does turn on during the test, then the compute has control of both speeds and it's a sensor causing the problem.

An overheating problem I had was due to a bad ECT, It was spitting out random values which caused the computer to think the coolant wasn't warmed up. This caused the engine to eventually overheat. Your issue could be something else, however.

ronstang94 · Aug 25, 2014

I forgot about this before, but as mentioned above, when you run the KOEO test the car will turn the fan on for a few seconds. I believe it will even run the fan at the two different speeds. All you need to do is put a jumper (or paperclip) between the two connectors shown in the link below. This is the same procedure for reading Check engine light codes by counting the flashes of the check engine light, but just do this to see if the fan comes on at both speeds.

http://www.stangnet.com/mustang-forums/threads/pulling-codes.819324/

doobismaximus · Aug 26, 2014

Just got a ford code reader for my 95 5.0. $26... toyman recommend it, worth its weight in gold. Might help diagnose your problem. Made by Innova

No Fan/over Heating Issue!!

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