Electric Fan HELP!!!!!

95_cobra123 · Apr 3, 2009

Ok i have looked at all the post and nothing is found i can not get my fan to work. if i run power to it and do it my self but if i let it warm up and turn on that way or by the ac way it wont work.....!!!!! i have some guys over that have 5.0 also and here to help so plz get back soon. Like i said the Fan does still work ran wires to it but will not work threw the computer or anything or how ever it is suppose to...

Thank You.

HISSIN50 · Apr 3, 2009

Check the EDF/HEDF portion of the following link.

fan circuit testing tech note

95_cobra123 · Apr 3, 2009

did everthing on that page... everything checked out...

Like i said i can get the fan to turn on by it self but will not turn on from comp. or ac thing.

HISSIN50 · Apr 3, 2009

95_cobra123 said:
did everthing on that page... everything checked out...

Like i said i can get the fan to turn on by it self but will not turn on from comp. or ac thing.

If you did everything on that page, then you had 12 V at CCRM pins 1 and 2 at or above 208*F (AC off)?

CCRM Pins 6 and 7 had 12V when the car was at 226* or the AC was on?

If so for both cases, check your wiring between the CCRM and fan itself. Your issue has to lie there.

If not, go back and re-test everything on that tech note. Because you think the EEC isn't triggering the fan, that would mean everything was not ok in those tests.

Good luck.

95_cobra123 · Apr 6, 2009

ok hissin i have done all of it put a new ccrm in and a new coolant temp sens. still no fan and the car is overheating in less then 2 or 3 mins well not overheating but i put a new autometer gauge in and it goes up to 230°. now i did put a new t-stat in a few weeks ago and the fan was working before then if that is staying close would it cause the fan not to work because the coolant temp sens. is nto getting a flow or reading. i am running out of ideas. and like i said i have doen everything in that page... and put new ones on.. we also checked to see if it was getting any volts to it threw the wires and it said yes. so now what lol...

Thank you sorry to bug u with this.

p.s. my 1/8th mile track opens the 11th and i want to see the 7's soon lol. j/k

Chythar · Apr 6, 2009

The computer turns the cooling fan on when it reads the coolant temp at 208*. If your ECT sensor is not working right the fan will not turn on. This is the sensor plugged into the metal heater hose on the passenger side of the engine. Do you have a good code reader that can read PIDs (engine sensors ,effectively)? The Autoxray I have will show me the coolant temperature that the computer sees. In your case, it's likely showing no reading or a reading that's jumping all around.

95_cobra123 · Apr 6, 2009

Like i said i put a new one in. and yes we did use a good one. so if the t stat is nto opening like i asked would that make it not work???

Thanks

Chythar · Apr 7, 2009

95_cobra123 said:
Like i said i put a new one in. and yes we did use a good one. so if the t stat is nto opening like i asked would that make it not work???

Thanks

No offense, but there are two temperature sensors. One is for the gauge (CTS - coolant temperature sensor) and one is for the computer (ECT - electronic coolant temperature sensor, I think).

The thermostat has no relation to the fan. If the thermostat was stuck closed you would definitely overheat, but the fan would still turn on. If the thermostat was stuck open, your engine might not warm up to operating temperature.

I just went over troubleshooting my fan with Hissin, so I have a bit of experience with this. The fan is directly controlled by the computer. When the fan is supposed to turn on, pin 14 at the CCRM (a dark blue wire) will suddenly have 12v. Pin 14 is the control from the computer. Pins 1 and 2 are red wires right near pin 14, on the same edge of the connector. They carry 12v out of the CCRM directly to the fan connector. They should only have 12v when pin 14 has 12v.

Can you run a KOEO test? The computer will turn the low and high speed fans on during that test.

95_cobra123 · Apr 7, 2009

yes the ect is the one i am talking about but like i said put a autometer gauge in so that would me i replace the othere sensor for the gauge i dont even have the old one hooked up any more.... would that matter do i have to have that one hooked up to run the fan or just the ect witch is the one i replace it with....

95_cobra123 · Apr 7, 2009

Ok here is the temp gauge one is that done right i am guessing yes. i did nto hook up the old one because it did not work anymore.

ok here is the old ect it does nto look to good to me. but what do i know

and here is the new on in.

The other thing this all started when i replaced my t-state and when the temp gauge stop working. hmm maybe that could be something with it.?

Thanks Guys the help is very much Appreciated!

Chythar · Apr 7, 2009

OK, you know about the CTS and ECT, you do know which is which. The only thing I can suggest is to get a good code reader to find out what temperature the ECT is reporting. Perhaps Hissin has more ideas; I'm fresh out.

95_cobra123 · Apr 7, 2009

could it be from the old wire that i did nto hook up?

HISSIN50 · Apr 8, 2009

95_cobra123 said:
could it be from the old wire that i did nto hook up?

Didnt you say all the CCRM tests passed? If so, the fan is being commanded to come on when it should (otherwise, you failed the tests in my tech note). And if Pin 14 and pin 17 are doing what they should, and when they should, the ECT is fine.

Per what I think I remember you saying, the issue *has* to lie between the CCRM and your fan. Did I miss something?

95_cobra123 · Apr 8, 2009

So the wire that goes to the old temp gauge does not have to be hooked back up. and if the t-stat was not working it would have nothing to do with it?

Chythar · Apr 8, 2009

Correct, the old wire going to the CTS (you replaced it with the blue wire) does not need to be hooked up. It feeds the temp gauge only. The computer only uses the ECT. The t-stat has nothing to do with the fan not working.

Have you checked the fuse for the fan? It's the only 60A fuse in the engine fuse box next to the battery.

95_cobra123 · Apr 8, 2009

yep did that also. i am running out of ideas. and i am starting to worry. my friend is the on that tested the ccrm i think there was one a point that we only got like 2v from one of those pins. i will have him read this and post back.

stroked302 · Apr 8, 2009

well first off we haven't done all the test......it was to late to start the car and let it warm up to test pins at appropriate temps...its a bit noisy at 1 in the morn

95_cobra123 · Apr 9, 2009

Yea but we turned it on and tried to just turn the ac to max to see if it would turn on and it would not turn on that way....

so that means there is something else wrong right? What i am saying if it wont turn on that way why would it turn on by just getting up to temp and we let it run for 3 mins and it was over 250 deg temp so its over heating to.

Chythar · Apr 9, 2009

Ah, so you DIDN'T test the CCRM? That makes more sense. As for the overheating, three minutes shouldn't be enough time for the engine to heat up the coolant that much. It took my Cobra clone about 10 minutes (I think) at idle to warm up enough for the fan to come on. It could have been as much as 15 minutes. From what I've read on here, it's more likely that you've got an air bubble in the system that needs to be cleared out. Basically, I believe the 250* is a false reading, and the coolant really isn't hot enough to turn the fan on.

Is your A/C system pressurized and blowing cold? If it's not, turning the A/C to max still won't turn the fan on because the A/C system won't work if there's no refrigerant in the system. Just tested that on my Cobra just now (just replaced the A/C hoses, haven't refilled the system yet). Can anyone else pitch in on this?

The only way I know of to check if your gauge is reading the right temperature is to get a code reader that reads PIDs (engine sensors) and tells you what the computer sees the temperature is. Another way is to measure the resistance on the ECT and the CTS to approximate the temperature. I think Hissin can tell you a bit more.

95_cobra123 · Apr 9, 2009

no we did he had the thing to test the ccrm also we took one out of my friends 94 to see if that made it work. and guess what it still did not work.

so back to this air bubble i had this guy that works for a dealer over today and he said an air bubble could throw off the sens. so the fan would not come on. i am nto sure if that is right but he gets off work tom. at 4 30 and we r going to see what we can do.

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