A/C not working at idle?

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.

4 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,959 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

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

SUDESH HARINARINE

MEMBER
3 POSTS

What should the voltage be on the red wire?

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Thursday, June 29th, 2023 AT 6:54 PM

KEN L

MASTER CERTIFIED MECHANIC
42,959 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

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Please go over this guide and get back to us.

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Friday, June 30th, 2023 AT 10:12 AM