A/C oddities (1 Viewer)

Spook50

My daughter likes Stitch
Joined
Feb 16, 2005
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6,143
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Spokane, WA
Because my truck likes to get alot of moisture inside (bad weatherstripping letting rainwater in, and a couple other factors), I usually drive with the heat on full and the A/C on to prevent the windows from fogging up. Today I noticed that with the engine warm and idling, a minute or so after switching on the A/C, I'd hear a click like a relay disengaging (or a breaker popping?) and my engine would drop back to normal idle. If I'd wait 3 to 5 minutes and turn it on again, the same thing would happen. Any idea what the cause of this could be?
 
Joined
Jan 20, 2003
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11,194
Location
Wherever the truck stops!!
That's the A/C amplifier cycling the compressor. The compressor doesn't run continuously, it only runs as required to provide sufficient pressure/flow for the refrigerant.
Try leaving it on and you'll hear the cycling as it runs.
 

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