Weird AC Issues: Cold to Hot air when windows up or down - TerrainForum.net: GMC Terrain Forum
 
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post #1 of 5 (permalink) Old 08-13-2019, 08:59 AM Thread Starter
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Weird AC Issues: Cold to Hot air when windows up or down

When AC is turned on, it's cold for a min then hot. When windows go down air is cold. Windows go back up, air is hot. Replaced cabin air filter and filled it up with refridgerant 2 months ago. Any ideas? Gonna look into it tomorrow or next day when time allows. It's a 2007 LS with 3.4L Thanks

2007 Equinox LS 3.4L FWD
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post #2 of 5 (permalink) Old 08-13-2019, 11:00 AM
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Originally Posted by defman View Post
When AC is turned on, it's cold for a min then hot. When windows go down air is cold. Windows go back up, air is hot. Replaced cabin air filter and filled it up with refrigerant 2 months ago. Any ideas? Gonna look into it tomorrow or next day when time allows. It's a 2007 LS with 3.4L Thanks
1 of 2 things could be happening, maybe 3: It's either over filled with refrigerant, or, there might be a leak in the system, or, you may have a blend-door and programming issue.

The climate control is literally designed to not let you freeze or fry yourself according to outside temperature and may limit operation of going toward all the way cold or all the way hot. To check and verify operation, unplug the from thermo-sensor located in the front bumper. If it is working accordingly then you should have the temperature desired on the operation knob. If not, have a dealer do a blend door calibration and system check. Also check the above fore-mentioned issues.

I hope this helps,
Starflare5.
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post #3 of 5 (permalink) Old 09-20-2019, 04:48 PM Thread Starter
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Thanks. After a couple weeks, the engine overheated at idle with AC on. Troubleshooted it and found possible AC compressor and fans issues. Took to a mechanic since it was a little out of my know how. Mechanic replaced AC compressor and all is working. He also says the fan assembly may need to be replaced if it overheats again. Noted that fans didn't come on when it overheated. Fan should be easy to replace since there are vids on YT. Thanks again.

2007 Equinox LS 3.4L FWD
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post #4 of 5 (permalink) Old 09-21-2019, 10:45 PM
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Does fan need replaced or is there just an electrical relay issue that's not turning the fan on when it's suppossed to? I'd look into that before replacing the entire fan ...
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post #5 of 5 (permalink) Old 09-22-2019, 04:33 PM Thread Starter
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Fuses and relays checked. If it's the fans, I'm guessing a bad connector which they're known for. Either way, car lives another day. It hasn't been overheating as of yet. Stays in normal range now.

2007 Equinox LS 3.4L FWD
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