moritzkoch65

Corolla AC Not Cooling

AC stopped working on my 2001 Toyota Corolla diesel. It doesn't cool, and the system doesn't switch on when I press the AC button. I've checked the fuses, but they seem fine. Could this be a refrigerant leak or a faulty AC relay? Any ideas?

The air conditioning in a 2001 Toyota Corolla diesel stopped working, with the system not cooling or switching on. Initial checks of the fuses showed no issues, leading to speculation about a refrigerant leak or a faulty AC relay. Suggestions included checking the pressure switch, which could prevent the compressor from engaging if low refrigerant pressure is detected. Ultimately, a workshop diagnosed and repaired defective valves in the air conditioning system, resolving the issue.

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4 comment(s)

I had a similar problem with my Corolla. Check the pressure switch; that was the culprit for me. If the system detects low refrigerant pressure, it won't engage the compressor to protect it. Might also be worth checking the blower motor to see if it's getting power, though that usually presents with other symptoms too.

Thanks! Where exactly is the pressure switch located, and how easy is it to test? I'm reasonably handy with a multimeter, but I don't want to start pulling things apart unnecessarily. Could a faulty temperature control cause this issue?

The pressure switch is usually located on or near the receiver drier, which is somewhere in the AC line, often in front of the radiator. A multimeter can help you check for continuity, but if you're not familiar with AC systems, I'd suggest taking it to a workshop. AC problems have been costly for me, and it is not worth the frustration of further damaging the system.

Appreciate the advice! I took it to a trusted workshop. After diagnostics, the workshop confirmed a defect in individual valves in the air conditioning system. Repair cost me around 1000€, but at least it's working again. Thanks again for pointing me in the right direction!

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TOYOTA

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COROLLA