Troubleshooting air compressor

BUSINESSFRED

MEMBER
2001 HONDA CIVIC
1.7L
4 CYL
2WD
AUTOMATIC
165,000 MILES

I have replaced relays and fuses only so far.

The compressor clutch does not engage.

And the condenser fan doesn't spin when I enable the A/C inside the car

What I want to know is:

Does the compressor clutch engage first or the condenser fan first?

I want to find out which part to replace first.

My radiator fan works fine but does not engage when I turn the A/C button on.

It only engages when reaching operating temperature.

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

This could be the same thing in that they both get the signal that the A/C is on and they turn on. So we may have an issue with the button or the signal from the button. I attached the wiring diagram and looking at the second one we need to check for voltage at number 4 or 5. This would be the easiest place to check to see if the switch is turning sending the signal to turn the system on. As you can see this signal makes it way to the PCM where the PCM is what turns both relays on which will turn the fan and compressor on. So if the PCM is getting the signal then we can track the signal coming out of the PCM to see if it is sending the signal.

If you don't have signal at 4 or 5 then you may have an issue with the pressure switch.

Let me know what you find. Thanks

https://www.2carpros.com/articles/how-to-check-wiring

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