CADILLAC DEVILLE AIR CONDITIONING DOES NOT COOL

Your coolant level switch at coolant tank may be bad,click here to see.

Check your anti freeze level

Check the actuator motor on the heater box inside down by the floor in the center of the car. The motor moves the paddles inside the heater to direct the heat and the ac. It is a small motor and on your car with climate control there is probably two of the motors. One for the passenger side and one for the driver side.

Hi,

It is located on the drivers side, above the transmission, between the engine block and the exhaust pipe from the front four cylinders.

A tip, wait for it to cool down, it's a tight spot, water hoses and wires all in the way, and that's after you remove the air cleaner assembly. Not really that bad when it's cool.

Or, check under the air cleaner on the 4.9 engine

Best regards

hopefully its only a broken linkage on the heater air box. this is loscated in the cabin under the dash board in front of where a passengers feet would go.
Another possibilty may be a broken controler. these are usually available for $75.00 from the junk yard. try "carparts.com"

4.6 Northstar V8. It is located on the rear of engine (driver side) in front. It is 1n the the waterpump housing cover. Remove airbox and intake tube and bottom radiator hose. 2 bolts(believe 10mm) on thermo housing. These systems are a lil finiky about air pockets....so fill slowly and let run at idle until operating temp and let cool and chk level.....fill as needed and repeat if needed.

Sounds like heater control valve.

Check fuses and lead wires to dampers.

try the pressure switch . it may be bad .

if the car running a hotter tempture it is design to shut off