The heater cluster in the dash has a selector control, fan speed, temp control,a/c switch and rear defroster switch in it. The off switch is on the selector control that is run by vacuum. I removed the glove box door and it looks like there is a vacuum line going two a fuse/ relay pannel on the passenger side. Is there a valcumm switch their that is not putting power to the cluster to make the a/c and rear window defroster not work. The vacuum valve that opens the cold air or heat door will not open in the heat position when you need heat it trys but will only move it a little bit.Can you tell me were to get a free wiring diagram and a vacuum diagram for the heater controls. thanks
Have you checked the vacuum line with a gauge? If so, how many pascal units does the vacuum line read? Vacuum gauges are around $5. Furthermore, I believe the design is sealed vacuum only system. The solenoid could be bad, but to my knowledge it is not an electrical component. A split in one of the vacuum lines could be cause of your problem. You would have to trace the all the vacuum lines back to the source to find the problem. You would need that gauge to detect a leak in the system. Could also replace all the vacuum lines on principle since the vehicle is going on two decades.
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The Oldsmobile and other makes with electronic control board's are plagued with problems. Call your local auto recyclers and get a replacement switch. As far as changing the switch once out of the dash it is just a matter of disconnecting it and hooking up the new one, fairly straight forward . You may need a torques screwdriver to remove it from the dash. Mike
SOURCE: 1992 Cadillac Coupe Deville blower fan runs all the time
The BLOWER MODULE is located on the A/C EVAPORATOR housing located UNDER THE HOOD passenger side firewall. Has 2 electrical connectors. Mounted with 4 screw bolts.Hope this helps
SOURCE: a/c -heat only comes out the defrost opening no
No the switch is probably ok. The problem is most likely the door actuator motor. It is a small electric motor that opens and close the the correct door to direct the air in the ac/heating ducts. These motors take place of the old cables that did the same job.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
SOURCE: 99 Buick Regal LS dual climate control. No heat passenger side.
the motor for the passenger side
blend door is shot
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