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1977 Buick Electra blows cold air all the time

Tiny
CLEEZYWEEZY24
  • MEMBER
  • 1977 BUICK ELECTRA
  • V8
  • 2WD
  • AUTOMATIC
  • 96,000 MILES
Its a olds 403, and the heat doesnt work. It blows cold air all the time. Even when the controls are turned off. And it only blows hard out of the defrosters. Both lines to the heater core are hot and I just changed the thermostat and had the radiator flushed. Any suggestions?
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Saturday, March 27th, 2010 AT 2:37 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Hi cleezyweezy24, Welcome to 2carpros and TY for the donation

Check if it has a heater control valve if so make sure its functioning if it continues your probable causes here could be an air mix/blend/mode door problems, vacuum and actuator to include the HVAC control module. Normally this type of problem is coming from behind the dash
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Saturday, March 27th, 2010 AT 2:55 PM

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