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98 durango a/c blowing thru defrost vents only
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bettshvac
New User
Jun 15, 2009, 4:29 PM
Post #1 of 4
(4145 views)
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98 durango a/c blowing thru defrost vents only
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98 Durango only blows thru the defrost vents and not thru the main vents in front of driver and passenger, know matter what setting it is on. I replaced the control panel and still the same problem. It may not be relevant but it seemed to start after plug and wires where repalced, is there a vaccum that could have come loose and caused this problem?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 15, 2009, 5:31 PM
Post #2 of 4
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Re: 98 durango a/c blowing thru defrost vents only
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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 resevoir (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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bettshvac
New User
Jun 17, 2009, 8:33 AM
Post #3 of 4
(4123 views)
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Re: 98 durango a/c blowing thru defrost vents only
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Thanks for the help, I found the leak and now all is well with the front a/c. Now can you help with the rear a/c. The blower wheel is broken and I need to replace. I have removed the vents but I really cannot tell how to get the blower wheel out so it can be replaced.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jun 17, 2009, 9:20 AM
Post #4 of 4
(4120 views)
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Re: 98 durango a/c blowing thru defrost vents only
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Here are the instructions for that
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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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