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panel blowers work intermittently
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lynnnny
New User
Aug 23, 2011, 6:16 PM
Post #1 of 6
(2175 views)
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panel blowers work intermittently
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1986 Plymouth Reliant SE (4 door) not sure of engine size at the moment, It has 75,000 original miles
My problem is 2-fold, My a/c is somewhat working. It blows cold air through the defroster and the floor vents, but intermittently through the panel vents. Its kind of hit and miss. Sometimes they start working when you stop and sometime when you are driving down the road. They go on and off. Also when I come to a stop with the air on the car vibrates terribly. I put it in park and it stops, I turn off the air and it stops?????? Any ideas?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 23, 2011, 6:38 PM
Post #2 of 6
(2164 views)
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Re: panel blowers work intermittently
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The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.
Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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lynnnny
New User
Aug 23, 2011, 6:55 PM
Post #3 of 6
(2149 views)
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Re: panel blowers work intermittently
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Thank you Hammertime. It does have some pretty old hoses, hopefully that will solve it. By the way, would that also cause the vibration of the car?
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 23, 2011, 7:02 PM
Post #4 of 6
(2143 views)
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Re: panel blowers work intermittently
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That may be tired motor mounts.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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lynnnny
New User
Aug 23, 2011, 7:11 PM
Post #5 of 6
(2135 views)
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Re: panel blowers work intermittently
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Hmm? just replaced those but will check anyway! Thank you for your help! You're the best!
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jjoedduque
New User
Aug 30, 2011, 8:27 PM
Post #6 of 6
(2100 views)
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Re: panel blowers work intermittently
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lynnnny, did you find your problem with the blower working intermittently. Was it a vacuum leak? My Dodge Ram 2500 Diesel Pick up has started doing the. The blower sometimes just stops and then starts again.  Let me know please.
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