Mysterious Option Problems
courtesy of Bob, The Auto Answer Man
Hope you can help my hubby trace down this problem, Bob! He recently replaced the alternator on my 1994 Chevrolet Beretta Z-26. He and my son had no problems at all accomplishing this task.
However, when the car was started again for the first time, two strange things had occurred. One, the heat no longer comes through the floor vents as it's supposed to - the heat is coming through the air conditioning vents now and I have no front windshield defroster at all now!! Secondly, my cruise control has also failed to work ever since replacing the alternator!
Are these problems connected with replacing the alternator, or freak coincidences? Would replacing the switch on the heat/air control correct this problem and again put the heat out through the proper vents and correct the defroster? Or, should he quit scratching his head, admit defeat, and take the car to our mechanic?
You have a loose vacuum supply line. The vent control and the cruise control are all operated by vacuum.
On the side of the car is a little can (sometimes metal like a coffee can, sometimes plastic like a round ball or a football). This is your main vacuum reservoir. Check to make sure all the line going to and from there are okay. Also, check to make sure that the main vacuum take off point (located on the intake manifold) is connected. If all those check out okay, go to the cruise control servo. Find the vacuum supply line and trace it back. Verify all connections until you wind up back at the intake.
It is possible that while they were in there working, they knocked something loose.
Bob, The Auto Answer Man
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