Heater problem
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Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
Heater problem
My heat works. I can not change the the settings on my vents it only blows out of the defrost. I need to know for sure what the problem is before i spend money on the wrong part. Thanks in advance
Post Fiend
Joined: Feb 2008
Posts: 10,977
Likes: 5
From: Lancaster, Pa.
Firemaster hit it right on. When you start the truck, if theres a leak, you should hear that little compressor turning on and running on the passenger side near the air reservoir. Another place to look is behind your glove box, theres a bunch of vaccum hoses back there that plug into a do dad thingy that diverts air to the selected area components, blend door, exct.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
If you have a 4x4 with ESOF the most likely cause is a vac leak in the vacuum system that locks the hubs.
For a quick diagnosis pull the vac line from each hub and plug each vac line. If the HVAC no longer defaults
to defrost one of the hubs has a leak.
Let us know the outcome and we can go from there.
For a quick diagnosis pull the vac line from each hub and plug each vac line. If the HVAC no longer defaults
to defrost one of the hubs has a leak.
Let us know the outcome and we can go from there.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
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Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
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From: Concord NC
If you are having problems while both in and out of 4wd, the I would start by looking at the ESOF solenoid.
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Thread Starter
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Logistics Pro
Joined: Dec 2010
Posts: 4,738
Likes: 15
From: Temperance, MI
Can you guys elaberate on the ESOF. I just checked the vacuume lines on the hubs, plugged them like you said and still nothing but defrost. I checked all the hoses behind the glove box everything is on and tight and i checked all the lines on PaysonPSD link under the hood, nothing seems to be wrong, anything else?
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
First, make sure you vacuum pump is running. if you are staying on defrost and if you have a bad line, you pump will be running. ESOF, electronic shift on the fly, it's the solenoid beside the vacuum pump. If the pump is running, unplug the line running to the solenoid and plug it. if the pump stops, there's your problem.
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
If it's running more than about 15 seconds or so, the yes you have a leak. Start at the vacuum and unplug lines, one at a time and seal opening and see which one causes it to stop. Might be close by and might still be under the dash. As mentioned, it could be the reservoir as well. Start by plugging all the lines at the pump and if it continues to run, bad pump...