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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

no defrost

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Old Nov 10, 2012 | 03:53 PM
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no defrost

My defrost doesn't work after my intake and carb swap. Is it vacuum operated?
 
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Old Nov 10, 2012 | 07:02 PM
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1983F1503004x4
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It depends. If you had factory, and I think dealer, A/C, then you have a vacuum operated HVAC controller. Just heaters only use cables, one for the blend door and another for the diverter door that routes the air.

I'm guessing your truck is a no A/C model, as from what I've heard, the models with A/C will spring back to defrost if something is wrong.

In which case, you'll need to get a new cable to go to the diverter door.
 
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Old Nov 10, 2012 | 07:09 PM
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Truck has no a/c
 
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