Climate control stuck in defrost/floor position


Mike Tonon

Guest
When I turn the knob on, it doesn’t matter which position I put it in, it stays on defrost/floor. Is it a cable? Is an actuator?

Thanks
 


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RangerFabWorks

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1990
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You have a busted vacuum line. Look under the hood of your truck. You will see a black round vacuum canister. Should have 2 lines going to it. Trace the red vacuum hose that leads into it. You should find a split or a break somewhere. Just piece in a section of rubber line. And you’ll be all set
 

Dirtman

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If it helps any here is the vacuum line diagram and control setting chart. Sorry they are pics from the manual I couldn't scan them.
Screenshot_20190331-180205_Gallery.jpg
Screenshot_20190331-180149_Photo Editor.jpg
 
Last edited:

Mike Tonon

Guest
You know... I just had the truck undercoated. I wonder if they broke something. I’ll look for that tomorrow. Thank you

Actually, I just checked. There were two vacuum lines, loose. Down near the passenger frame rail. More toward the radiator, there is this ball looking thing, that looked like it should have two vacuum lines going to it. So I stuck them on there. Still didn’t work. I flipped them and still nothing. What should I do next? I didn’t see any other loose vacuum lines.
 
Last edited by a moderator:

Mike Tonon

Guest
Never mind, I started my engine this morning and it worked. I looked in my repair manual and it said that the lines are not interchangeable, so since it worked I ASSUME I put them in the correct places. Anyways, thanks for the help.
 


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