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1998 Chevy S-10 heater not working

Tiny
JT20010
  • MEMBER
  • 1998 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
  • 135,000 MILES
My heater isn't working its just blowing in the air from outside. We flushed the heater core out and checked fuses. The heater core is gettin hot water to it though.
Wednesday, February 18th, 2009 AT 1:46 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Did you check the thermostat? Could be an air mix/blend/mode door problem to include vacuum/ actuators and the HVAC control module
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Wednesday, February 18th, 2009 AT 2:01 PM
Tiny
IMPALASS
  • MECHANIC
  • 3,112 POSTS
Hello -

So I understand what you are saying... When you select high blower speed and hot temp control and floor - no hot air on floor but air comes out there....... If you select vents..... Air comes out vents just not hot....... Same with defrost?

You have checked to make sure you have the correct coolant level..... At operating temperature you turned the heater on high and made sure the coolant was totally full.

Does the temperature of the engine coolant stay where it should be or has it changed at all?

At operating temperature you feel both heater hoses going in and coming out of the dash... Both are hot?
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Wednesday, February 18th, 2009 AT 2:02 PM

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