1994 Chevy Astro Heater

1994 CHEVROLET ASTRO
191,000 MILES • 6 CYL • 2WD • AUTOMATIC
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RWATSON28
  • MEMBER
  • 3 POSTS
The heater only blows lukewarm air. The system was flushed and I replaced the thermostat with a 195 degree OEM. No improvement. The two hoses going to the water control valve are hot and the lower short hose from the valve to the heater core is hot. However, the upper short hose is barely warm. By the way the coolant that was flushed was suprising clean. I try to change it every year or so. This change in air temperature happened rather suddenly. It normally blows like a furnace.
Thanks,
Bob
Feb 7, 2009 at 9:51 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,240 POSTS
Hi:
If the upper short hose is coming from the heater core, then the core must be plugged. When you flushed the radiator, did you also do the heater core? If not, that is what I recommend.

Let me know.

Joe
Feb 7, 2009 at 12:53 PM
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