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Heater problem

Old Oct 1, 2009 | 03:57 PM
  #1  
G Littman's Avatar
G Littman
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Default Heater problem

I inherited an 81' Vette that I'm rebuilding and have discovered the heater blows fine (no pun) with NO HEAT. There's a new thermostat and the engine's just been totally gone over and worked on. What would cause a perfectly warmed up engine and working thermostat, to not blow hot air?

Thank you.

G
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Old Oct 1, 2009 | 04:05 PM
  #2  
jimmyshine's Avatar
jimmyshine
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probably a bad shut off valve (if it's still in place).
check valve if totally open, then check vacuum on that valve.
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Old Oct 1, 2009 | 04:09 PM
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spedaleden
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1 st check for a valve on one of the heater hoses. There maybe a shut off valve installed to keep the cooler in the summer.

2nd check The factory installs a valve on the heater hose. This valve has a vacuum line attached to it. You need to make sure it working properly.

3rd check temp cable from heater control. Make sure it is moving the door properly.
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