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Old 02-19-2021, 05:11 AM   #1
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Default Defrost not working

I get heat just fine from the main vents but when I switch it over to defrost, it doesn't change anything and I still have heat blowing through the main vents. Any help would be greatly appreciated!
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Old 02-19-2021, 05:18 AM   #2
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To me it sounds like the linkage that would change the zone for the air is disconnected or something. I would look there first.

That is, assuming you have the manual controls for the hvac, not the push button.
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Old 02-19-2021, 12:35 PM   #3
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Yeah, midnight sun is probably right on it. Pull the radio bezel and all the stuff around the A/C control panel to get a look. It uses stiff wire cables to operate the controls. They could be disconnected or broken at the controls or at the components.
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Old 02-21-2021, 05:19 AM   #4
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The cable housings usually pop loose from the retaining clips.
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Old 02-28-2021, 12:29 AM   #5
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Awesome, thanks for the help!
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Old 03-05-2021, 09:10 PM   #6
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For the manual controls, do the cables need to be greased? Mine works fine, but sometimes when switching from one vent to another there will be a little bit of resistance before the cable moves. Maybe the housing is moving a little before the cable starts sliding inside it.
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Old 03-05-2021, 10:01 PM   #7
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Quote:
Originally Posted by Pinstripe View Post
For the manual controls, do the cables need to be greased? Mine works fine, but sometimes when switching from one vent to another there will be a little bit of resistance before the cable moves. Maybe the housing is moving a little before the cable starts sliding inside it.
Sometimes leaves get in the physical door that opens and closes inside the ducts.
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Old 03-06-2021, 06:28 AM   #8
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Sometimes leaves get in the physical door that opens and closes inside the ducts.
That's a good point. How do you fix that, stick a vacuum into the wiper cowl area?

I'm pretty sure the little bit of resistance I have is from the cables, because I can see it sort of flex and bow upwards a little. My dashboard is all taken apart so I can see.
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Old 03-06-2021, 05:58 PM   #9
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Quote:
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That's a good point. How do you fix that, stick a vacuum into the wiper cowl area?
I don't think it is going to be that easy. The only way in is probably to remove the Cooling unit (if the truck has A/C) or the Heater duct (no A/C) shown below. That's about the only way to access the ventilator doors.



The vent door is shown below in the tiny diagram.



These images are from the 1994 Service Manual, in the HA (Heat/Air) section.
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Old 03-06-2021, 10:16 PM   #10
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Thanks jp2code!
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