Heater is stuck on Defrost
#1
Heater is stuck on Defrost
My heater is stuck on the defrost mode. I checked the vacum lines, they are fine. I have a 3 prong sylinoid with two vacum line conectors which I replaced with a new one that is located next to the battery on the firewall. I have read it was supposed to engage to create vacume when I switched from different settings like floor to defrost. I never hear the sylinoid work. This same sylinoid is also supposed to engage my ESOF. The ESOF does not matter cause I have switched to manuel hubs. Any thoughts from the experts or ones gone down this same road.
SM
SM
#2
Stuck defrost
Welcome, Slingnsteel!
I'm far from an expert, but from what I've read here trying to get my ride up to snuff (99 F250 SD 6.8L CC XLT 4x4) it does sound like there's a vacuum leak. When you said you checked the lines, did that include the ones for the ESOF you don't use anymore? If they were removed when you changed to manual hubs, could any plugs/new lines have come loose?
Like I said, I'm not an expert, just trying to help.
I'm far from an expert, but from what I've read here trying to get my ride up to snuff (99 F250 SD 6.8L CC XLT 4x4) it does sound like there's a vacuum leak. When you said you checked the lines, did that include the ones for the ESOF you don't use anymore? If they were removed when you changed to manual hubs, could any plugs/new lines have come loose?
Like I said, I'm not an expert, just trying to help.
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Guys...not sure this is vacuum related. My 2003 has been switched to manual hubs, and the vacuum lines are not plugged, and my heat/ac controls all work fine. My father in law's 99 has ESOF with NO lines or plugs, and his heat/ac controls all work fine. If I recall, the defrost/floor/dash door is actually electrically controlled and there is an electric servomotor on the heater box under the dash that controls it. I know for sure that is how the temperature is controlled, because I had to replace it on my old 99. So you may want to look into that.
#11
I checked my vacum lines, they are fine. The vacume for this truck is held in a canister behind the battery passenger side. I believe the vacume is created with a sylinoid on the firewall next to the battery. I also believe this same sylinoid engages the auto hubs for the ESOF. It is a new sylinoid and does not make a peep. The sylinoid on the transfer case that engages the 4x4 is an aftermarket. Would that have anything to do with the sylinoid on the firewall not responding.
SM
SM
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I found a link that I hope will help me figure out my solinoid problem. Here is the link
http://www.justanswer.com/uploads/mu...20056_1123.pdf
http://www.justanswer.com/uploads/mu...20056_1123.pdf
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