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1997 Chevy Cheyenne How to check and replace heater core

Tiny
PLANBTYPEA
  • MEMBER
  • 1997 CHEVROLET CHEYENNE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
The heater in the cab has begun to blow nothing but cold air. The A/C still works great. I had a coolant leak earlier in the year, flushed radiator and replaced thremostat. The enginge is running about 190 +/- a little bit after it has warmed up. One of the few things I have never done to a motor is deal with the heater. I am lost on even where it is in this truck.
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Tuesday, October 28th, 2008 AT 10:21 PM

1 Reply

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
When cores go bad is because they leak into pass floor. No heat maybe a blend door /controler problem. Core maybe cloged you can try removing hoses and flush with garden hose. First feel hoses are they both hot same as rad hose? If so then blend door if one hot one cool then core cloged.
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Friday, October 31st, 2008 AT 1:33 PM

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