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1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

heater core going down?

   
Old Nov 3, 2011 | 08:10 PM
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wyowelder's Avatar
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From: Torrington,WY
Default heater core going down?
pickup blows very slowly and only through the defrost vents barely blows at idle but at highway speed really pushes air. blew out intake vents and cab vents with compressed air trying to clean it out whats goin on?
 
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Old Nov 3, 2011 | 08:25 PM
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H.R.D's Avatar
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I would say you have a vacuum leak.
 
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Old Nov 3, 2011 | 08:51 PM
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tower_ofpower's Avatar
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Truck have ac or no? Ac condenser fins could be plugging up too. Vacuum leak is worth looking into too.


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