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My air conditioner started blowing hot air last summer. I put coolant in it and didn't run it until the beginning of summer this year (2011). All of a sudden it started working again. Sometimes it blows hot but if I keep it running full blast the coolness comes back. I don't know why this happened.
does your blower motor work or it just blowing cold air?
if it does not blow then check the fuse, the motor may be bad
if it blows cold air only then check your coolant level
check to see if the heater hoses are hot on both of them
if the hoses are hot then you may have a blend door actuator bad
Sounds like a leak. If you've had to recharge the system every year, you're losing refrigerant. If you've added refrigerant on your own, you may have overcharged the system. The best way to find out is to get a refrigerant pressure gauge and check the pressure. A reading between 30-40 psi is in the normal range. Below 30 will require a recharge, above will require releasing refrigerant.
Your problem is a faulty heater control valve. The design used on these vehicles allows for hot water to flow constantly and compete with the evaporator as there is no blender door. You have to replace the valve and possibly the control head. Meanwhile, you can bypass the valve to have cold air
it's leaking... usually to find the leak there is a dye you put in that can be seen under UV light- if the system has a serious leak you may need to replace even more due to dirt in the system. good luck!
Seems that someone, somewhere may have forgotten to connect control cables, which operate the valve which controls the flow of coolant from the engine to the interior unit of the heater....The heater and the air conditioner, are separate, different units....They share a common housing, but have little to do with each other.....
Take it back to the body shop and tell them to check.
Temporary solution - I found that the pump under the hood gets stuck intermittenly from dirt getting behind the clutch assembly where the belt drives the unit. Blast the back with air then apply Silicone spray (Not WD40) to help keep things running smoother. The wiring connector gets rusted or loose sometimes as well. Also, if the dash gets too hot in the summer, the selector switch contacts don't work right and the damper under the dash gets hung up and wont open or close the air to the vents. I've been fighting this almost 5 years now. It's been in the shop 6 times - NO HELP THERE! Good luck!