A/C not working properly

ANTHONY RUBIO

MEMBER
2001 VOLKSWAGEN GTI
2.8L
V6
2WD
MANUAL
180,000 MILES

So my A/C has a problem. When I had bought the car off of a very close friend of mine. And I remember the day on a morning he had said he had the heater on. A/C was working fine until it out of nowhere shut off on heat and now the car gets warm. But very minimally warm. But the problem is that the A/C unit itself doesn’t light up. As if it doesn’t have any electricity going to power it at all.

3 Replies

KASEKENNY

MECHANIC
18,907 POSTS

Based on this info you may have two issues. You may have an issue with the HVAC control module and the air doors. However, it could also be the HVAC control module causing both issues. The lighting issue with the control module is most likely with the unit itself. So unfortunately we are going to most likely need to replace that. If you would like to confirm the lighting issue, then turn the lights on so that all would be on and measure voltage at pin 5 at the back of the control module on T12. I suspect you will have voltage but the lights will not be on. If this is the case then the control module is the issue. Also, these lights and other interior lights are running off the same circuit so if this module is the only issue then it shows the circuit is not the issue.

Let me know if you have questions and we can go from there. Thanks

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Wednesday, April 8th, 2020 AT 8:17 AM

ANTHONY RUBIO

MEMBER
2 POSTS

Just tried that actually the other day (replace 2 different Control modules) and still nothing not one of them gets a single bit of single or bit of electricity to even flash on.

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Wednesday, April 8th, 2020 AT 8:31 PM

KASEKENNY

MECHANIC
18,907 POSTS

Strange. So that means we either have a power issue or more likely a ground issue.

Just to confirm, you have an auto climate system and not a manual correct?

This is the wiring diagram that we have for the auto system. You need to check for voltage on pin 9 of connector A and 14 on B. Then you need to check ground G202.

I attached the diagram and other info but we need to know if we have power on these circuits and a good ground.

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