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-   -   cooling fans not working... already replaced resistor (http://www.focusfanatics.com/forum/showthread.php?t=232451)

Jboy1788 05-24-2010 05:23 PM

cooling fans not working... already replaced resistor
 
so as title says my cooling fans are not working both of them... a/c blows warm air. replaced the resistor two weeks ago thought it might have went out again got a new one... didn't fix it... checked the pig tail and it has power no prob so no burnt wires... what else could be the prob / what should i test for now???
2001 5 spd zetec dohc w/ a/c

sailor 05-24-2010 06:21 PM

Posted via FF MobileHmmm, are you saying that fans don`t come on with A/C on? And A/C is not operating? my recollection says there`s a relationship there. Double check A/C info sticky at page top for detailed info., my memory of another thread says that the fan comes on with A/C when compressor kicks on (does on my car), and without enough refrigerant to run compressor, or anotheer problem keeping it from running, fan won`t come on just because A/C is turned on...

Jboy1788 05-24-2010 06:33 PM

fans dont come on at all causing the a/c to not work and car to overheat.

BC_ZX3 05-24-2010 06:38 PM

Quote:

Originally Posted by Jboy1788 (Post 3290591)
what else could be the prob / what should i test for now???
2001 5 spd zetec dohc w/ a/c

Fuses, relays, Cylinder Head Temperature (CHT) sensor, CHT sensor wiring, fans themselves (do they spin smoothly(?) or apply 12V directly)

Do you have a wiring diagram?

Jboy1788 05-24-2010 06:48 PM

checked fuses and relays those are fine. fans spin smoothly and fans themselves do work w/ 12v direct to them..

BC_ZX3 05-24-2010 06:54 PM

Try putting your instrument cluster into diagnostic mode, go for a drive and see what the CHT sensor is reading.

http://www.focushacks.com/?modid=37&...gnostic%20Mode

BTW, what symptoms of overheating are you experiencing? Are you just going by the gauge reading or are you experiencing other more obvious overheating signs?

Jboy1788 05-24-2010 07:11 PM

ill check that out... but just going by the gauge reading and the fact that my a/c was working just fine then as soon as the gauge started going high then the a/c started blowing out hot air and looking under the hood fans never turned on.

Jboy1788 05-24-2010 07:57 PM

alright put my car into diagnostic mode and temp sensor seems to be working fine b/c as soon as it almost hits red its reading 119 C then i shut it down and threw a fan infront of it... also geting a dtc from diagnostic mode of D262 which converts to U1262 for obdII which is saying "Missing SCP Message" and all the info i find on that isn't to good / nothing relates to my prob... any ideas?

sailor 05-24-2010 11:08 PM

Quote:

Originally Posted by Jboy1788 (Post 3290591)
so as title says my cooling fans are not working both of them... a/c blows warm air. replaced the resistor two weeks ago thought it might have went out again got a new one... didn't fix it... checked the pig tail and it has power no prob so no burnt wires... what else could be the prob / what should i test for now???
2001 5 spd zetec dohc w/ a/c



Posted via FF MobileIf the pigtail has power, and resistors are good, a connection to the fans and a good ground is all you need... So, test for ground at fan connector/trace back as needed.. good ground? then that "power` is just a voltage reading, no ampps to run fans, so a bad connection on that side somewhere.

4ST AIR 05-25-2010 08:44 AM

Quote:

Originally Posted by Jboy1788 (Post 3290661)
checked fuses and relays those are fine. fans spin smoothly and fans themselves do work w/ 12v direct to them..

This may be dumb, but it did happen to me. The 2nd fan fuse wiring went bad, burned out on the power side. I checked it with a test light, had power, then I removed it to look at it, and it was fine. Apparrently, it was burnt and barely connected, but not where you could see. placed the fuse back in, and couldn't figure out why the fans didn't work. Happen to run a test light on it later, and no power! Pulled the fuse again, noticed that it looked fine, but came out much easier...dismantled the fuse box, noticed that the wire was burnt up to the fuse connector inside the fuse box on the hot side of the fuse connection (about 1-1/2"). Repalced the wire, good to go. Did you check the relays and fuses by visual, or by test light? There should be power to the fan fuses with the ignition on. If not using a test light, try that. But then again, it sounds like you already may have done that...


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