Heater problem
Thread Starter
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Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
Congrads on the fix. i wish i could figure mine out still, i now have the knowledge thanks to the guys here, i have the time thanks to unemployment, but S.O.B. i cant figure it out
Hotshot
Joined: Nov 2006
Posts: 11,288
Likes: 269
From: North of Greenville
Don't know if y'all saw my other thread, but I got my situation fixed. Turned out that it was just a disconnected fitting on the floor/panel damper motor. Slipped the tubing back into place and I have heat on the floor again.
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Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
Yeah i was one of the guys who noticed it, i know its not that. Ive gone threw everthing, ill clear my mind of it and try again later
Hotshot
Joined: Nov 2006
Posts: 11,288
Likes: 269
From: North of Greenville
If you're gettign air out of the front panel and defrost vents, it has to be a leak in the loop around the floor/panel damper.
It could be any or some of the following:
- leaking switch/switch connections
- leaking/loose (or maybe even pinched) yellow or white tubing
- leaking fitting at the damper motor (where mine was, essentially)
- leaking (cracked) damper motor body
- leaking diaphragm in the damper motor
- loose/disconnected linkage between the damper motor and the damper...
... if you look over the schematic that Robin provided in Post #47, any problems anywhere else would cause you to lose vacuum/function of either your defrost or panel vents. It was that narrowing down process which made me stop trying to chase the entire vacuum system and focus on the only places where the problem could be.
It could be any or some of the following:
- leaking switch/switch connections
- leaking/loose (or maybe even pinched) yellow or white tubing
- leaking fitting at the damper motor (where mine was, essentially)
- leaking (cracked) damper motor body
- leaking diaphragm in the damper motor
- loose/disconnected linkage between the damper motor and the damper...
... if you look over the schematic that Robin provided in Post #47, any problems anywhere else would cause you to lose vacuum/function of either your defrost or panel vents. It was that narrowing down process which made me stop trying to chase the entire vacuum system and focus on the only places where the problem could be.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Thanks to the local junk yard I was able to replace the vacuum control motor for the air inlet door and that sealed up the leak. So one salvaged vacuum pump and one salvaged vaccum control motor and the system's working 4.0. If only I could get my door ajar sensors to be 100% reliable I'd be pleased...
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
Thanks to the local junk yard I was able to replace the vacuum control motor for the air inlet door and that sealed up the leak. So one salvaged vacuum pump and one salvaged vaccum control motor and the system's working 4.0. If only I could get my door ajar sensors to be 100% reliable I'd be pleased...
New User
Joined: Jun 2010
Posts: 14
Likes: 0
One of the things that helped me out as I traced the leak was keeping a quiet environment and putting my ear up to connections. I took apart my dash so I could remove the heater control unit and then I listened right there to see if I could hear air leaking by (since all of the lines come together right there. Once I identified that air was leaking through there I was able to start chasing things by pulling subsequent lines and then listening at the control unit to see if the air was still going past. After chasing three of four options I identified the culprit.
On a separate note I found a post about the door ajar sensor and was able to fix it with a touch of WD-40.
Edit: Damn, by the time I wrote my post the answer was already there!
On a separate note I found a post about the door ajar sensor and was able to fix it with a touch of WD-40.
Edit: Damn, by the time I wrote my post the answer was already there!
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
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Thread Starter
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Logistics Pro
Joined: Dec 2010
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From: Temperance, MI
Trying to find a quiet enviroment where i live is hard. Then my next problem is i cannot hear im 45% deaf in both ears and my wife works a lot (shes my ears). Ill get it fixed on of these days. Oh im only getting air outta my defrost so i know i have a vacuum leak i just cant find it.
Posting Guru
Joined: Feb 2009
Posts: 1,325
Likes: 4
From: Blaine, TN
Hey john, if you suspect a vacuum leak, I'll tell you the easiest way I have found to find it. Since a vacuum leak is hard to find, an air pressure leak is the easy way. Take an air compressor, regulate it down to about 10lbs of air and rig up a fitting with whatever you have to the vacuum tank. Just remove the line that goes to the pump and hook it up there. Pressurize the tank and lines, if you can't hear it leaking somewhere, you can take a spray bottle with soap and find one that way, unless its the oring in the hubs.
Hope that may help you or save you a little time anyways lol.
Hope that may help you or save you a little time anyways lol.
Posting Guru
Joined: Feb 2009
Posts: 1,325
Likes: 4
From: Blaine, TN
Goodluck John, it's best to start with the simplest things first like fuses etc and all the others have said and work your way to the harder more time consuming things. Let us know what you find!
Junior User
Joined: Oct 2008
Posts: 85
Likes: 1
From: Marblehead, MA
I'm having a similar problem after replacing the cabin fan motor and regulator. I must have knicked a vacuum line as the vent selector switch does nothing now. One addtitional problem I have is there is very little volume of air coming through even with the fan on high. Motor is spooling up fine....just not much coming out the vents. Does that still point to a vacuum leak?
My truck an early '99 and has manual hubs.
Thread Starter
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Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
I havent had a lot of time to figure out where my vacuum leak is. I put warn hubs on the truck not to long ago so I was thiking if i could just eliminate the vacuum line running to the hubs all together, any thoughts?
Junior User
Joined: Oct 2008
Posts: 85
Likes: 1
From: Marblehead, MA
Thanks for this diagram Payson...it's been a big help. Other responses have helped pin point part of the problem.
I'm having a similar problem after replacing the cabin fan motor and regulator. I must have knicked a vacuum line as the vent selector switch does nothing now. One addtitional problem I have is there is very little volume of air coming through even with the fan on high. Motor is spooling up fine....just not much coming out the vents. Does that still point to a vacuum leak?
My truck an early '99 and has manual hubs.
I'm having a similar problem after replacing the cabin fan motor and regulator. I must have knicked a vacuum line as the vent selector switch does nothing now. One addtitional problem I have is there is very little volume of air coming through even with the fan on high. Motor is spooling up fine....just not much coming out the vents. Does that still point to a vacuum leak?
My truck an early '99 and has manual hubs.