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Heater doesn't blow hot air

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Mar 28, 2011, 12:50 PM

Post #1 of 3 (5628 views)
Heater doesn't blow hot air Sign In

Hi, I have this 1996 Chevrolet Silverado pickup.Not sure the cubic in but it is a six cyl and the milage is arounf 52,000. My problem is I'm not getting any hot air to come out of the vents. Nor the defroster. Blower motor works fine. Thanks for any advice...Pete

Hammer Time
Ultimate Carjunky / Moderator
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Mar 28, 2011, 12:55 PM

Post #2 of 3 (5622 views)
Re: Heater doesn't blow hot air Sign In

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If not too hot to hold, then you have to look at the actual engine temp and if that is up, if it is, then your looking at a restricted heater core.
If you find that they are both too hot to hold, then the heat in that vehicle is controlled by a blend door that regulates heated air flow. it is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.
If they are both not too hot to hold on to, then you either have a restricted heater core or the system is not completely full and getting air pockets for some reason.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Tom Greenleaf
Ultimate Carjunky / Moderator
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Mar 31, 2011, 1:57 AM

Post #3 of 3 (5603 views)
Re: Heater doesn't blow hot air Sign In

Right on HT. To add, if this just recently worked properly and coolant/antifreeze is properly full I think the weakest link is the stripped actuator. If not full of coolant/antifreeze at radiator (never mind just the recovery tank) then the leak needs to be fixed first as an overheat will soon follow,


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