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PT's Radiator Fan and AC Fans Not Kicking On

 
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Old 05 Aug 2013, 02:17 pm
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Default PT's Radiator Fan and AC Fans Not Kicking On

Hey guys,
this is my first time on these forums; I figured I'd give them a try! I've got a 2001 PT, and it's having some issues. Right now we've got a mysterious problem with the AC, where the fans won't kick on, and numerous mechanics are pointing to different things (apparently the fan assembly isn't a problem, but some are saying the car's computer, some are saying the AC compressor). One of the mechanics admitted that they had no idea what the problem was, and that they needed to replace possible components one by one until they found the problem. We just had another problem with the radiator's fan won't kick on, and the engine was overheating a bit. We got the radiator fan checked out, and they don't know what the problem is either (no fuse is blown, it just won't turn on). It's now rigged to run all the time until the problem is fixed. I'm not sure if these are related or not, but does anyone else have any insight into this problem?

Last edited by Speedy77; 05 Aug 2013 at 02:19 pm.
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Old 05 Aug 2013, 03:11 pm
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Question Re: PT's Radiator Fan and AC Fans Not Kicking On

I suppose the DID check the ECT sensor,right?
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Old 05 Aug 2013, 03:14 pm
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Default Re: PT's Radiator Fan and AC Fans Not Kicking On

I would assume so, but it won't hurt to ask!
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Old 05 Aug 2013, 03:27 pm
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Post Re: PT's Radiator Fan and AC Fans Not Kicking On

If the ECT sensor isn't working right,it won't send the signal to the fan relays.
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Old 05 Aug 2013, 05:12 pm
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Default Re: PT's Radiator Fan and AC Fans Not Kicking On

Speedy,

Here's the schematic for the first generation radiator fan. There's not much to it. You do have 2 fuses, so check both. One in the interior fuse block, the other in the Power Distribution Center in the engine compartment. An easy way to check all the components is to hook up a scanner. The scanner can turn both the low and high speed fan on and off and let you know if the PCM or eight of the relays are bad.

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Old 05 Aug 2013, 09:49 pm
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Default Re: PT's Radiator Fan and AC Fans Not Kicking On

Check the temp reading from the diagnostic port. If the computer thinks it's running cooler than it actually is. It wont turn on the fan. Check the temp with a laser temp thermometer to confirm this. If it's showing the correct temps then your problem is elsewhere. Mine ran with the ac on but wouldnt turn on otherwise. Temp read 165 when it was at 200 plus. High idle and codes for rich fuel and low temp operation. Computer fixed mine.
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