Core Type Block Heater

By Likarok
December 3, 2009 in 1982-2005 Chevrolet S-10/Blazer & GMC S15/Sonoma/Jimmy

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Likarok

Posted December 3, 2009

I will be honest. I have never heard of this type of block heater before. Last night I went to plug in and thought my heater was pooched. Until this morning it started great. They I discover it has this type of "Dry Heater"

Seems to work great.

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- Hot air constantly blowing through floor vents, drivers side only?
  
  By davester · Posted 1 hour ago
  
  And there aren't any "bellows". There are solid plastic doors the actuators move, which largely seal just by themselves, and then have a strip of foam around the edge to better seal the door. The foam does deteriorate over time, but this is unlikely to be a significant cause of the problem.
- Hot air constantly blowing through floor vents, drivers side only?
  
  By davester · Posted 1 hour ago
  
  are the heater controls set for hot or cold air? If it's set for hot, and say, to get air from outside the cab (vs recirculated air), even w the fan off, air will get pushed through the hvac system, over the heater core and into the cab. Switching it to cold will reduce the temp to whatever it is outside. Switching to recirculate mode (which may mean switching to vents or whatever, read your owners manual), will reduce the amount of airflow through the hvac system.
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