If its a north star motor ,pistons are seizing LET IT COOL DOWN these motors are very bad when overheating ,find out why its overheating and fix it fast if you don't want more problems,these motors have the worst overheating problems up to 2010 they stoped making the motors because of overheating trouble. bolts in heads weaken from overheating and then soon after you have a blowen head gasket.
SOURCE: 1999 Caddy Deville A/C problem
A/C systems are hard to diagnose without having access to the vehicle. One of the most common problems is undercharge (Not enough freon in the system) indicating a leak somewhere in the system. Other causes could be a burnt A/C compressor clutch fuse, defective compressor clutch, defective compressor/belt, defective High/Low pressure switches in the system, defective evaporator icing switch, defective wiring... Basically, you're better off getting the system diagnosed by a good A/C knowledgeable mechanic...
SOURCE: "repost" 83 cad deville won't start after driving when hot
will it start after cooling off? if so , check for fuel lines near anything that can get hot..(vapor lock) insulate or move them..
SOURCE: prndl switch problem error code e91 and ee 91.92 cadillac deville
the switch on top of the transmission where the shift cable is . it probly is not anny good. check all wiring . make sure thair is no dirt inside the connector
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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