Heater problem
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
John and Pete,
Here is a PDF I put together with diagrams of the climate control vacuum system for manual A/C.
If you need something similar for the automatic climate control let me know.
Hope this helps with trouble shooting.
Here is a PDF I put together with diagrams of the climate control vacuum system for manual A/C.
If you need something similar for the automatic climate control let me know.
Hope this helps with trouble shooting.
Tuned
Joined: Oct 2005
Posts: 427
Likes: 1
From: Melrose MN
Do know if anyone else got theirs fixed, but I fixed mine today. Turns out that valve that went to the hubs leaked. I bypassed it since I installed manual lockouts. I actually bought a hand vac pumpand checked every line and the res. all checked out.
New User
Joined: Jun 2010
Posts: 14
Likes: 0
My truck (1999 F250 7.3L) started doing this very thing over the weekend. I've checked a number of lines and cannot find vacuum anywhere so I'm thinking the vacuum pump has gone out. That being said, it will still shift into 4H/4L like usual. I've got the pump out, going to check the junkyard first and then go from there.
Would the ESOF still work if the pump was bad? The hubs are in auto and I can here the click with each shift into 4H from 2WD. The shift to 4L happens like usual also.
Would the ESOF still work if the pump was bad? The hubs are in auto and I can here the click with each shift into 4H from 2WD. The shift to 4L happens like usual also.
New User
Joined: Jun 2010
Posts: 14
Likes: 0
I haven't heard the pump running in about a week but I didn't need the heater or vent since the last I heard it run. From the bat I was curious but since the ESOF worked I assumed the pump was working. I did have to replace the lines running to the hubs from the last ninety in the line as they were so dry rotted one had actually broken off (I recently bought the truck used and had been meaning to swap them).
Thread Starter
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Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
Are you positive that it is working? The light on the gauge cluster isnt something i went by before i got my warn locks. If you didnt hear it going then it is probable shot. To make sure mine engaged id get in the snow or on the ice and giverhell with my hear out the window to make sure it engaged, redneck i know
New User
Joined: Jun 2010
Posts: 14
Likes: 0
I can hear the "click" and then it illuminates. It is definitely going into 4L, I can tell just by driving down the road--the lower shifts, etc. I will have to wait until tomorrow to verify the front tires will spin, I live in southern Arizona so I'm short on snow but long on sand. Plus the dash is sorta in pieces while I was chasing vacuum lines.
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Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
I had the same issue i could hear it go into 4L but when it came to 4H it was a different story. im betting its not working. Weve got enough snow here in Michigan you should come grab a truck bed full lol
Senior User
Joined: Mar 2003
Posts: 274
Likes: 0
The black pot behind the glove box dose not controll the blend door, it controlls the vent, floor and defrost position. Just to the right is a step motor (I think thats what it's called) that controlls the blend door. I know that because I could not get any heat and found the blend door was not working because the motor was shot.
New User
Joined: Jun 2010
Posts: 14
Likes: 0
I picked up a pump today from the local junk yard and put it in. Sure enough it fired up the minute I turned the key and started to draw a vacuum on the system. And then kept going. And going. And going. I ended up starting the truck and letting it run for a few minutes figuring maybe it was just taking a long time to draw a good vacuum on the whole system but the pump never quite stopped.
I disconnected the hose from the pump to the reservoir and sealed it with my finger and it stopped right away. I then disconnected the same hose but the end on the reservoir side and sealed it--stopped right away. When I connected the hose that comes out of the reservoir and feeds the rest of the system and sealed it with my finger the pump never shut off. I guess I have a busted reservoir too, now I have to figure out how to get it out of there so I can look it over or replace it...
I disconnected the hose from the pump to the reservoir and sealed it with my finger and it stopped right away. I then disconnected the same hose but the end on the reservoir side and sealed it--stopped right away. When I connected the hose that comes out of the reservoir and feeds the rest of the system and sealed it with my finger the pump never shut off. I guess I have a busted reservoir too, now I have to figure out how to get it out of there so I can look it over or replace it...
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
The black pot behind the glove box dose not controll the blend door, it controlls the vent, floor and defrost position. Just to the right is a step motor (I think thats what it's called) that controlls the blend door. I know that because I could not get any heat and found the blend door was not working because the motor was shot.
New User
Joined: Jun 2010
Posts: 14
Likes: 0
Looks like it's not the reservoir. After an hour and a half of trying to not burn myself on the drop light (I've got to get one of the new LED drop lights) I traced the leak to what I believe is called the blend door actuator (I wanted to post a picture but am failing at the upload process, it opens the recirc door under the passenger-side dash when the A/C is on max). If I take the vacuum line off of it and plug it with my finger the pump stops and does not come back on. If I connect the line to the actuator the pump runs for 22-25 seconds and shuts off, then starts again after 12-14 seconds and will just repeat this cycle. I can hear the air leaking through it when I hold it up to my ear after the pump shuts off. Tomorrow hold another trip to the junk yard I suppose...
New User
Joined: Jun 2010
Posts: 14
Likes: 0
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...