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Heater control valve?


Dawes
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Nope, no valve from the factory.

 

First, you need to check the heater core for a blockage. Thats super simple. Get the car up to temp, and check the heater hoses. If they are both the same temp, the core is good. If not mark the cold one, and flush it thru that side with the garden hose.

 

If the core is good, then the blend door may not be opening. That may just be a cable adjustment.

 

If the fan isnt working, then it may be the switch, or the resistor pack.

 

The heater on the ea cars is pretty basic.

Edited by crazyhorse001
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I dont have one to look at, but you should be able to poke your head down under the dash while someone moves it from hot to cold and back. You should see levers moving when you do. If you cant see the levers, im not sure where to tell you to look. Maybe one of the gurus can help out with pics or scans from the service manual.

Edited by crazyhorse001
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If you have one hot hose, and one not so hot, yep the heater core is plugged. You may be able to put a SMALL amount of drain cleaner(like maybe a cup) in the hose. Take both off at the engine, raise the ends as high as you can, put the cleaner in, then fill the hoses with water. I reccomend CLR brand to clean it with. Let it sit an hour or so, then flush the core with water. The CLR isnt as harsh as the other stuff. Hopefully you're not undoing a previous repair with a stop leak.

 

I'd try this before having to take the dash apart to change the heater core.

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Sounds like the resistor pack is gone bad on you. As a temporary measure you can pull a fused wire directly to the motor from the battert. That will get your fan running on hi till you can source a resistor pack.

 

Also it sounds like the doors in the control box arent working properly. Thats gonna require pulling stuff apart.

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