this post was submitted on 23 Aug 2024
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Diagnosing A/C Failure When Idling (self.mechanicadvice)
submitted 3 months ago* (last edited 3 months ago) by venusaur to c/mechanicadvice
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2001 QX4

It has been 90+ degrees where I live and when idling for more than 10-15 min, the A/C stops blowing cold and is humid. Works great otherwise when ambient temps are low and car is moving. The Freon pressure is good. The Enser is old and has some dents, but has been cleaned and looks to be getting airflow. How can I tell what is wrong? Replace the radiator fan clutch? Condenser? Something else? Should also note that the engine temp gets high when on long stretches up uphill highway, but I think that is somewhat normal for an old car, no? Thanks!

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[–] venusaur 1 points 3 months ago (1 children)

Yeah I used a pump. That reminds me. I think there might have been a leak because it wasn’t holding zero pressure. If that’s the case then moisture could be getting in, but wouldn’t that cause the system to not function properly all the time?

[–] [email protected] 2 points 3 months ago (1 children)

depends on how much is in it.

[–] venusaur 1 points 3 months ago (1 children)

Do you know what the next steps would be to find and fix the leak? Dye? Leak detector device?

[–] [email protected] 3 points 3 months ago (1 children)

leak sniffer, last time I needed one I rented it from the auto parts store that had tool rental, it was like $5 but I had to leave A big deposit until I returned it.

[–] venusaur 1 points 3 months ago

Cool. I did that with the pump and gauge set. I’ll try it. Thanks!