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1991 Chevrolet S10 Question: why does it still blow cold?

 

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rob112277, 4.3L V6, Neah Bay, WA, November 14, 2012, 18:45
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thermostat has been changed,hoses are all hot to touch,hoses out of heater core are both hot,cable style control inside of dash seems to be working( i hear flaps moving around)..what could it still be? its not like a dead winter cold that blows out of it, just feels like it has a tinge of warmth to it..just not a lot or enough to do anything really..

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