Question about Cadillac DeVille
The vacuum hose is on the passenger side in the engine compartment between the heater hoses and the fender, probably has a leak.
It could also be the blend door actuator which is usually beneath the dash on the passenger side where your blower motor is. To access it, you need to remove most of the dash, a pain to do, but that is what has to be done. Let me know how this turns out.
Posted on Jul 26, 2009
The air blend door actuator and/or climate control unit is probably faulty...most likely it is the air door actuator...The actuator is usually in the vent housing behind the control panel. You can follow the vacuum lines from the A/C heater control to the actuator..Rockauto.com has a new one for $98.79...The A/C Delco part number is:1572215
Click on the link to go to there website:
Posted on Jul 25, 2009
The problem is the blower door actuator. It's vacuum driven and diverts incoming air from the defrost, to vents, to the floor and any combination. When the air flow can't be redirected, it's a very good indicatioin of a vacuum leak.
To identify the leak, turn the car on with the AC on high. Open the hood and start tracing the vacuum line, starting at the firewall on the passengers side and work your way backward. You're looking or listening for a pinhole in the line. You may find no holes but the line itself is disconnected altogether. Best of luck finding the vacuum problem and feel free to post back with any questions or concerns.
Posted on Jul 25, 2009
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Posted on Jan 02, 2017
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