Question about 2000 Chevrolet Blazer

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If the heater is not getting warm and the temp gage is reading around 180 degrees could it be a valve or the temp control switch?

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This sounds like the blend door actuator. This is a little door in the vent box down under the passenger side dash that opens and closes to change the vent temperature from heat to a/c. It is a little motor that opens the door. It tends to stop working due to the elements that it is in. I hope this helps!! Thanks!!

Posted on Oct 06, 2010

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The manual is not showing a heater control valve for your car, so I would suspect the blend door. That said, I would make sure the heater hoses are both getting hot at the firewall, just for grins.

Back to the blend door. I'm not familiar with the design of your system. I would suggest you look under the dash and see if you can see the doors actuating as you change the mode settings. See if you can find the actuator that moves when you change the temperature setting. Maybe it doesn't move but tries to? this would be the blend door actuator. If you can find it, see if it's working. If not, take it off and see if the door operates freely by hand. If not, you will have to open the heater box to fix it. If it works OK by hand, the actuator is probably stripped inside. You can hook it up to the controller while it's off the hearer box just to see what it does. Replace if it isn't working or has stripped gears. OK?

Posted on Oct 06, 2010

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