Freon level is low. Add a can of sealer. oil charge and refrigerant.. It is possible that the dryer is bad as well.
One suggestion is to change the "blower resistor". To check if the blower resistor has gone bad, check if the blower fan works if set to "Max" and does not work if set on a slower speed.
If the fan speeds all work but the air coming out of the vent is not cold, the problem is likely because the rubber gaskets connecting all of the tubes for the compressor, condensor, of the A/C system have shrunk because of non-use. When the gaskets (o-rings) shrink, the freon leaks out and the system can no longer cool.
You our can take it to a professional for a refill ($50 to $150 I think) The oil in the refill mixture will swell the rubber o-rings and they will stay swelled if you use it regularly.
You can also buying a do-it-yourself system from an auto parts store. ($50 including can of freon and adaptor). There are very specific instructions and some people claim the anti-leak additives can damage the compressor but, it may be the best option for a car worth about $3000.
SOURCE: 1995 cadillac deville 4.9 eng no heat
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
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SOURCE: I have a 1991 cadillac deville
I have a 92 Deville. All the flushing in the world will not fix the cloged up heater core. The flush will clean out the passenger side of the core but will not clean the core on the drivers side. I have just repaced my core and seen how these fail, It is a bad design that caddys are known for. It was recomended I do a total flush of the system every 30,000 and then just maybe I would not have to endure the core change again. As the antifreeze runs through the car it does a chemical change due to all the different metals and rubber it flows through. since the heater core is small with small bands to let the coolant in and out, it builds up with the sludge from the chemical change. Thus closing off the drivers side first. Note, both the inlet and outlet are on the passenger side, you really cant flush fluid where it builds up the sludge in the core. Solution, new core after trying a flush
SOURCE: 1999 cadillac deville air wont work
There's a blower motor (fan) under the hood and up against the firewall near the center of the car that takes some work to remove. It has gone out in the last 2 of my 4 Cadillacs. Turns out if you're not real careful with the positioning of the spark plug wires they will brush up against it, and if one of them gets cracked or brittle it will "arc" and short out the blower motor. The a/c compressor should still come on (you'll hear a click when it engages) but you won't get any air blowing into the cabin, hot or cold.
The part was like $200 stock (year 2000 prices) and it took about an hour to remove it. My Caddy at that time had this damn strut bar going across the engine bay which we eventually removed to get to the blower motor.
SOURCE: 1998 DeVille: 1999 cadillac deville drver side heat blows hot pa...
The blend door for the passenger side is not connected right or functioning correctly. Try seeing if the dial on the armrest on the passenger side is not rotated one way or the other too much.
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