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Re: a/c not changing to heater
The air temp control blend door is inop, it may be electric or driven by engine vaccum, but either way this is the problem to fix. I suspect yours is vaccum since more than one function is not working, temp control and air distribution, i.e. floor, defrost and dash vents
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Are you sure youhave the correct code? Look in the glove-box. Somewhere, usually on the left side on the bottom there is a small sticker with two sets of numbers. The five numbers standing by themselves are the code for the radio installed by the manufacturer. If you or someone else changed the radio, you may have to contact the radio manufacturer with the serial number of the radio for the correct code.
Has the car been regularly service including changing the engine coolant ?
If not, this maybe due to clogged heater valve, hoses, or the heater matrix (like a small radiator that sits behind the car dashboard).
If the coolant has been regularly changed, it is most likely that the heater control valve is faulty, or the cable that connects it to the heater control on the dash board is either faulty or disconnected.
autozone.com has the best available information that is at no charge. They give you step by step instrucions and pictures with exploded views. Once you do the brakes a time or two it will be a snap. At the site simply add your vehicle and go to vehicle repair guides. Hope this helps.
Maybe this is a multiple post. The best available no charge is autozone. com When you go to the site, input your vehicle information and go to vehicle repair guides. They have step by step instructions and exploded views. Once you do the brakes a time or two it will be a snap. Hope this helps.