QuestionI have a 92 olds 88 that won't blow air conditioning out the dash vents, only blows through the defrost vents. Could a vacuum hose be disconnected?
AnswerTodd,
Good guess. Yes this is a very good possibility. The defualt position for the ventilation system in the event of a fault occurring is the defrost vents so that your windshield can defog if this occurs during the winter.
From your description, There are three possibilities that come to mind.
The first being a problem with your vaccuum source hose. It may be disconnected or have a large enough leak that it is not sending the vaccuum to your harness connector. Your vaccuum source usually comes from your brake booster. I would start there.
The second possibility is that your harness connector that sends the vaccuum to different actuators dependent upon where you select with the switch may be faulty and is no longer opening/closing the correct valves.
And the third possibility is that your control head is not sending the appropriate electrical signals to your vaccuum harness connector to make it change valves.
I would first verify that your source hose is connected and is in good condition. Then make certain that your vaccuum source is pulling the appropriate amount of vaccuum. (Typically 8-10 inches of mercury vaccuum)
If these check out, I recommend taking your vehicle to a reputable shop and have them diagnose it further. They will have the appropriate equipment to determine where your fault actually lies. Digging into it yourself will not only be time consuming, but also can get very confusing if you are not knowledgeable in the manner the vaccuum/electric system works.
Thank you for your question. I hope I was of some help. If I can do anything more either now or in the future, do not hesitate to ask. If you found this response at all helpful, please remember to rate this answer. Thanks again and good luck in everything.
