Radiator fans don't work but blow when you turn A/C on.
Apr 18, 2021 at 5:58 PM
radiator fans not working when A/C is turned on?
2002 VOLKSWAGEN BEETLE
SADIE MARIE
- MEMBER
- 2 POSTS
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KASEKENNY
- ✓ASE Certified Mechanic
- 18,907 POSTS
The reason they come on when the A/C is on is that the control module commands them on to blow air over the condenser. This is a different circuit so that just confirms that the fans work and that this is a circuit issue.
What I would do is refer to the wiring diagram below and check voltage from the ECM and coolant fan control switch to the coolant module.
https://www.2carpros.com/articles/how-to-check-wiring
So just go to the module and let the car warm up and then check the voltage on these wires and that will give us a good idea as to what is happening.
I suspect the ECM is the issue but we need to make sure the coolant module is getting the proper voltage from it or we will just be guessing. Thanks
What I would do is refer to the wiring diagram below and check voltage from the ECM and coolant fan control switch to the coolant module.
https://www.2carpros.com/articles/how-to-check-wiring
So just go to the module and let the car warm up and then check the voltage on these wires and that will give us a good idea as to what is happening.
I suspect the ECM is the issue but we need to make sure the coolant module is getting the proper voltage from it or we will just be guessing. Thanks
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Professional Diagram for 2CarPros Members
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Professional Diagram for 2CarPros Members
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Professional Diagram for 2CarPros Members
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Professional Diagram for 2CarPros Members
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Apr 18, 2021 at 7:19 PM
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