I HAD HEAT IN MY BLAZER

1998 Chevrolet Blazer

Tiny

jnurse

March, 7, 2013 AT 12:37 AM

I had heat in my blazer.I had pinhole on heatercore hose.I cut off the bad spot. Hooked hose backup lost heat.I replaced thermostat had radiator flushed still no heat

FOUND 4984 RELATED QUESTIONS

No Heat

37 ANSWERS
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3 Answers

Tiny

Wrenchtech

March, 7, 2013 AT 12:40 AM

You probably have air trapped in the heater core. That's why we usually use vacuum to fill the cooling system.

Tiny

jnurse

March, 7, 2013 AT 12:55 AM

How do I get the airpocket out

Tiny

Wrenchtech

March, 7, 2013 AT 1:00 AM

It should work out on it's own.
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 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.

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