A/C not working at idle?

Tiny
SUDESH HARINARINE
  • MEMBER
  • 2015 TOYOTA COROLLA
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 106,562 MILES
A/C works while driving fine when you're at an idle the A/C compressor turns off and the radiator fan does not work, only with the A/C at idle. My car does not overheat. The only thing I noticed is the A/C pressure goes up and the compressor turns off because the fan does not come on the cool the cond. Down.
Wednesday, June 28th, 2023 AT 7:27 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,149 POSTS
Yes, the condenser fan must run with the A/C system on so this is the problem. Here is the A/C fan wiring diagram so you can see how the system works. There are 7 fuses that run the system that we should check for power first, here is a guide to help and use the wiring diagrams to see which fuses they are.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuses are okay, I would swap out the Fan Relay1 also, does the fan come on at all Check out the images (below). Please let us know how it goes.
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Thursday, June 29th, 2023 AT 12:22 PM
Tiny
SUDESH HARINARINE
  • MEMBER
  • 3 POSTS
What should the red wire on the coolant module on the radiator, because when I apply 12v to the fan motor wiring everything works okay. My radiator fan does not work but the car never overheated. Thanks
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Thursday, June 29th, 2023 AT 6:42 PM
Tiny
SUDESH HARINARINE
  • MEMBER
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What should the voltage be on the red wire?
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Thursday, June 29th, 2023 AT 6:54 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,149 POSTS
That looks like a sensing wire between the cooling fan ECU and the PCM. Did you check the fuses and relays?

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

We should do a CAN scan as well; you can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

Please go over this guide and get back to us.
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Friday, June 30th, 2023 AT 10:12 AM

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