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PostPosted: Mon Jun 19, 2023 5:33 pm 
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Joined: Wed Mar 04, 2015 9:23 pm
Posts: 19
Year and Trim: 1984 Buick Century Olympia 3.8SFI Turbo
Hi folks. I'm trying to troubleshoot my 87 Electra Park Avenue climate control. I was able to locate the broken wire in the exterior temp sensor, however now I need a readable manual to help troubleshoot the vacuum actuated parts of the system. I got pictures of the manual pages a long time ago (attached here https://drive.google.com/file/d/1T38rfT ... sp=sharing) but I am unable to read this due to the scan quality. Does anyone have a link to a better copy?

While I wait for a reply I'm going to look at the vacuum lines from the solenoid assembly. The current symptom is like this:
Start car with hot interior and setting at 75°F
Climate control starts blowing cold from the dash vents.
After interior cools down some, air discharge shifts to defrost/floor vents.
Will not return to dash vents unless I put the setting at 60°F (minimum) at which time it returns to dash vents. But then it gets too cold.

If I remember, it switches from recirc to fresh air after it starts to cool down. Makes me think there is a leak in the system so that switching away from recirc causes vacuum loss.

Many thanks in advance.
Sincerely,
David


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