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intermittent ac problems
I have a 2012 Malibu the ac comes and goes at will. Any ideas?
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Intermittent cooling is often caused by parts of the AC system freezing up. Typically an iced over evaporator. If the evaporator is covered in ice can’t cool the air. Once the ice melts, the cold air eventually returns. Could be a dirty cabin air filter or a blocked evaporator drain or an overcharged system. Do you see any puddles of water under your car?
OR
you could have a blower control module device which is all electronic. With these there was usually a display that showed fans speeds on an LCD readout in the vehicles. The relays could fail in various ways. The fan speeds could be different speeds than they were, sometimes varying while driving. But they also could continue to drain current from the battery when off.
These are two pictures to show what the electronic module is like.
Search on the net for location pictures or diagrams for your vehicle. These came from rockauto.com
Lesabres and H-bodies had them on top of the blower box under the hood near the cowl. They had a master
fuse block above them that could be loosened with one bolt and moved for easier access.
Later models had the control module inside close to the blower with part of it inside the airstream
inside the blower box. The moving air is needed for cooling the device.
Also search for the Chevy/GMC clone of the Transport. Likely more of them on road
with more people posting about them...
2014 Malibu 2LT, 2015 Cruze 2LT,