While driving and using the front AC, sometimes the rear AC turns on by itself. I turn the rear AC swith on then off and it does not resolve the problem. I have shut the truck off and the AC continues to run draining the battery, alos when it shuts itself off I have shut the truck off taken key from ignition and the rear AC turns on by itself. I don't believe in ghosts so what is the issue? Have there been recalls for this?
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The RPM while driving were higher than when you pulled into the Driveway.
Check and top off the Radiator Fluid. Low levels cause this fluctuation. Make sure the engine is cool. Remove the radiator cap. Turn the engine on and turn both the front and rear heater on high when filling. Make sure you use only straight Radiator Fluid (not mixed) in the Reservoir. Replace the cap before it reaches normal operation temperature.
Now check the heating inside with the van. Is it any better?
IF NOT: There maybe a problem with the thermostat, egine coolant temperature sensor, or with the Water Pump itself. I would start with the Thermostat replacement, followed by the Sensor, before replacing the Water Pump. Work $mall and up to Big to save you money.
On most vehicles with front and rear A/C, the two systems are basically independant of each other just sharing the compressor and condensor. It is possible that the Mode Door (controls where the air flow is sent; ie: windshield, vents, floor) is out of adjustment or sticking.