AC blowing hot, GMC Acadia

The surge you are seeing will happen each time the compressor cycles. When it comes on it puts a little strain on the engine and it will reduce the RPM's. Sorry, I do not know where your relay is located. Did you leak test the system to determine you can maintain a full refrigerant charge?

I tried pulling the relay and reinserting, and the AC began working again, now on day 3. So something in the control module must have "rebooted". $0 fix, hoping it sticks. Regarding refrigerant charge, pressure is squarely in the green. Thanks for input!

Which fuse did you pull? I am having the same issues!

I pulled and reinserted the compressor relay (cube shape) and pulled/reinserted the compressor clutch fuse. It somehow reset and started blowing cold again. My first $0.00 repair!

Where can I find the compressor relay? I am googling it now trying to figure it out!

under hood, there is a fuse box with a cover. under the cover there is a map showing the location of all the fuses/relays

I see one that just shows A/C clutch thats the one I want?

Well I just tried pulling both of those and it unfortunately did not fix my issue.... Still no ac

reprogram the ac ecu with last software

Try replacing the serpentine belt. If it is slipping you will have issues with the AC when the compressor kicks on.

I'm having problems with my 2009 gmc acadia when I turn on the AC cold air comes out but if I put the car in park and rev the idle to about 2000 rpm the air conditioning light blinks and the idle rpm drop someone help me I took it to gmc and they said my underhood fuse box is bad is that true

They told me the same thing that the fuse box is getting hot I have the exact same problem your having