SOURCE: gear select problem
The PRND321 switch is mounted on the transaxle assembly. It is a multi-signal switch sending information relative to gear selector position to the BCM and ECM. The PRND321 switch also contains the neutral safety {start} switch and back-up light switch. It also provides park input to the automatic door lock module {if equipped}. Your problem is not an internal transmission problem. The service manual says to check for open circuits or shorted ground circuits through a diagnosis chart that is in this manual. One part of it, at the end says to replace the PRND321 switch and the other says to replace the BCM or repair the open circuit or wire, depending on what code is read through the BCM. Having worked at a Buick dealership, I have sold a few of the switches for various problems. This switch is under the hood and on top of the transmission in-which it is exposed to heat - cold and water. My suggestion is to reset and clear the codes on the diagnostic center and see if they come back. Check connectors on the switch and if codes come back replace switch since it would be less expensive than a BCM. The switch is a wear item as it is moved every time you move the gear selector.
SOURCE: High beam dimmer switch on a 1989 Cadillac Seville
The dimmer switch operates an actuator that pushes on a rod and then that rod goes down the steering column and pushes on the actual dimmer switch which is near the bottom of the steering column, u will need to remove the trim under the steering column and then the must remove the 2 nuts that hold the column to the bottom of dash, carefully lay the column on the seat and then u will have access to the dimmer switch, actuate the switch and see if the rod moves, if it doesn't then u must replace the dimmer switch rod actuator plastic piece at the top of the column, if it does move up and down either the dimmer switch has come loose or the dimmer switch is defective.
SOURCE: 99 cadillac seville continues to overheat even though i put a new water pump
maybe the water pump wasnt the problem to begin with. if the engine temperature only goes up when you stop the car then most likely it is the FANS that are not engaging to cool the radiator which is a problem with the fan sensor, computer that controls the fans, relay/fuse. I had the same problem on my 1999 cady STS coming back from my vacation. the engine temperature would be normal only when I drove the car above 70km/hr because the air passing through the front of the car would cool the radiator. when I slowed down the fans wouldnt start and no air was passing through to cool the rad, hence the engine temperature would start to go to HOT. good luck.
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