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Re: front a/c is cold rear is not freon is fully
This is caused by a bad expansion valve in the rear on the evaporator. This or a bad dampener motor in the rear. You have to take apart the right rear inside molding and trim to get to everything. Be careful taking things apart try not to be rough with anything. You can also check the lines on the bottom of the car under the rear passenger side. You will see 2 aluminum lines, a large one and a small one, the large one should be very cold and the small one should be very hot. If either is the same as the outside temperature then you have a problem in the expansion valve or evaporator. I recommend replacing both of them at the same time.
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If the front blows cold it would suggest that the freon level is ok. However, if the freon is low, it still may blow somewhat cold in the front and less adequate in the back. Have you had the pressures checked to verify the charge is ok? Does the rear fan motor work? There also may be a restriction or defective expansion valve in the rear causing little/no freon circulation. Another problem could be a defective/stuck blend door in the rear causing the cold air to not circulate
The flap that directs cold air and warm air may be stuck in warm air position. This flap is controlled by a vacuum operated actuator that is attached to the vacuum lines and the control panel. This can go bad. Otherwise check in compressor sight glass to make sure there is no air bubbles or fog, that would indicate a leak in the system
The car uses the same freon in the front as it does in the rear. If the rear a/c is working, you either have a plugged evaporator in the front unit, or perhaps a bad heater switch. Try switching the heater to hot and see if it blows even warmer air from the front vents. If so, the heater switch is working and then it sounds like a plugged evaporator or maybe a plugged orifice tube. That is a good place to start looking. Hope this helps.
hi gc, if you are getting cold air and warm air out of different vents with the a/c on, I would recommend having the a/c freon checked. if the system is low, it can cause cold air out one side and warm air out the other. if it is low, the system should also be checked for the source of the leak.freon has oil in it that keeps the compressor internally lubricated and when freon leaks out, moisture can get in the system.