I own a GM Van 2007 and the battery is draining overnight, the battery is brand new, the alternator is new. The evap unit on air conditioning unit freezes is freezing up within 10 minutes of driving and the air conditioning is not being operated. In addition, the heater goes out within 10 minutes of driving. Does this have anything to do with a relay or a short in the system? These symptoms happen at the same time.
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If the air conditioner is turned off and not being deliberately used and the unit is freezing up anyway you do have a short that is turning it on and running it on its own. This could also remain hot after you turn the van off, causing battery drain. There are many electrical system wires under the drivers seat floor mat that can be damaged. The main fuse block is in the engine compartment, under the hood, drivers side. Once the key is turned off you should be able to source the problem if you understand basic electrical system operations.
