Motor Vehicle Maintenance & Repair Asked by 3Dave on December 4, 2020
2007 Escalade AWD.
Yesterday, I noticed that the air conditioning keeps turning on and off.
To clarify: the control unit does not indicate that it’s turning off. I still have the fancy snowflake icon, temp set to desired level, etc.
Air will blow cold for a few seconds, then warmer, then cold, and so on. After the car has been running for awhile it seems that the period of on/off increases, but it never gets back to 100% on.
We’re in Dallas, and I can tell you that global warming is real. Temps are well over 100° (F) lately.
This happens if the car is stopped (idling at a light), moving, or whatever. There appears to be no correlation between vehicle speed and AC functionality.
The car is not overheating.
Oil was changed by a local shop about a week ago, otherwise no recent service.
I’m going to put some UV dye in the system and look for leaks, but I’d be surprised if one randomly appeared. It feels more like the compressor is periodically engaging / disengaging, and I’m not sure what would cause that to start out of the blue.
Thoughts?
First you should get a service for your AC. All AC´s more or less slowly leak coolant gas. If it has last been serviced 2 or 3 years ago, chances are you are simply running low on coolant. If there is too little gas in the system, it either shuts off - or it can even get damaged.
If, after a refill of your AC, the Problems prevail, check the AC compressor clutch relay (as @Al_ mentioned) and the clutch itself, in that order.
Answered by Daniel on December 4, 2020
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