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Check the vacuum lines in the engine compartment that go to the firewall if your A/C switches to defrost on your 1997 Cadillac Deville. Find an approx 1/4" rubber hose that goes into the firewall around the center of the firewall and trace it back to the motor and make sure it hasn't come loose. If not that, then it may have come loose at the a/c control panel. hope it can help you and good luck--------------------------------------------------------------------------------------------- OBD2 Fault Code Reader
you can locate the low limit switch and unplug it and use a wire to jump the terminals in the socket..that will start the compressor, car running of course, then add proper amt freon and plug switch back in The switch should be on an ac line and have 2 wires
check or loss of vacuum to mode control switch in dash ac control. these are not blend doors, they are air flow control, a blend door controls the air temperature not where it comes out.
Work the headlight switch round and round first. That's the dimming feature of the dash lights. Maybe they messed with it. Digital dashes have problems especially at that age of car. If nothing works see about a used one from a salvage yard
I'm pretty sure the door that directs the air between the defroster and front vents is vacuum actuated. Check the vacuum lines in the engine compartment that go to the firewall. Find an approx 1/4" rubber hose that goes into the firewall around the center of the firewall and trace it back to the motor and make sure it hasn't come loose.
If not that, then it may have come loose at the a/c control panel. That will be much more difficult to get at to check. You may be able to access it through the front of the dash.
Hi,check if the compressor clutch is engaging,if not check the conection at the compressor if ok check,fuse ,or relay ,if those are fine and the commpressor is engaging,check freon presure ,may be too high or low, if this is the case ,correct the problem and disconect the negative cable from the battery for a minute to reprogram the sistem..C1
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