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Radiator Fan Only Runs w/ Ac

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Old 31 Jul 2015, 02:56 pm
Fresh Cruiser
Join Date: Jul 2015
Posts: 2
Unhappy Radiator Fan Only Runs w/ Ac

Not sure if this is the right subforum to place this in, but I'm a n00b.

Hi all, I've been a lurker for a while. This forum has answered a lot of my questions, but before I'm told to use the "search" feature I've scoured the pages and haven't found my exact problem and am exasperated. Thank you so much for taking time to read this.

My 2001 le pt cruiser radiator fan only runs if I take the low fan relay out (the relay is good--I replace both hi and lo) OR if I run the ac full blast. What would cause the radiator fan to run ONLY when running the ac full blast but not kick on at any other time (which causes the engine to overheat, so I constantly run the ac). No wires seem to be ground out, and I read I could unplug the coolant temperature sensor to keep the fans running at all times, but I don't know where it (sensor) is at. Also, is it okay to run the ac in the meantime (short term fix) or will this cause something to burn out?

I also have tranny issues, and have a link to justanswer (yeah, I know, paid a rediculous fee to ask a "mechanic" something that I already had reasearched/thought of and had worked on already)
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Old 31 Jul 2015, 07:11 pm
Obsessed Cruiser
Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,620
Default Re: Radiator Fan Only Runs w/ Ac

I would suggest you check your temperature sensor and the wiring from the sensor to the PCM. Make sure there is good contact on both ends of the wiring. If your temperature sensor is not working properly then it may not let the PCM know that the radiator fan needs to come on.

Make sure your coolant system is not leaking coolant.

I would also make sure you don't have air in the coolant system. If coolant is not making contact with the temperature sensor then it will not work properly.

Last edited by ptcruisersteve; 31 Jul 2015 at 07:16 pm.
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Old 31 Jul 2015, 07:35 pm
Fresh Cruiser
Join Date: Jul 2015
Posts: 2
Default Re: Radiator Fan Only Runs w/ Ac

I will check it. From illustrations I've seen, it seems to be right by the thermostat housing. Thanks for your reply.
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