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My 1999 chevy silverado 1500 ac won't blow cold air,it seems like the ac/heater control module won't switch over and its stuck on heater.I already had it charged with freon.Is this module costly and how much trouble is taking the dash apart,to install a new one if thats what I need? lmk thx Rob
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The best way to get an answer for this go onto Youtube and they usually have fixrs for everything. Between last year and this year I have saved myself thousands of dollars repairing stuff myself through youtube.
I like that you were knowledgeable to check both coolant lines tells me you are getting hot coolant through the heater core next thing to check will be the blend door on the inside of your vehicle. The blend door is a door that switches from cold air duct to heater duct depending on what you are using at the time. If it is stuck on the cold air duct you will not get any heat sometimes these doors are vacuum actuated and sometimes they are electrically actuated most the time you are able to see the movement of the motor from inside if you don't see any movement but you hear it move chances are it is the door blend I hope this helps.
Number one you didn't get Freon in your charge. So if you paid for Freon which is super expensive you got ripped off. It takes r134. And just cause you. Charged the system did you have the system tested. If not tested by a good hvac shop you may have clogged filters or other issues including your bad controls. Also it may have leaked out again if there is a leak
There is a fan control module mounted in the air plenum that is known for going bad.Check the connector where it plug's in under the case below the glove box for a burnt connection.Usually the connectors will melt but it can still be bad where it goe's into case.It need's airflow to cool the resistor,s for the differant blower speeds.
I would first check the low pressure cycling switch. Next the compressor clutch. I am assiming you already checked the fuses. I hope this helps.
Thank You,
Roy
Had the same problem with my Mazda6 awhile back. Took it to the dealer and they found the radiator wasn't holding pressure. They replaced the whole radiator under warranty (WHEW!). Not sure how to check for that kind of thing, but it's a start.
Sounds like the blend door in the ducting has failed, this door is what controls the temp of the outlet air by blending heat and outside air or AC cooled air.
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