2002 Chevy Astro The Fan not work on up just on floor

Tiny
KORKORO
  • MEMBER
  • 2002 CHEVROLET ASTRO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 309,000 MILES
Hi there my heating system is not working on top parts only on floor. The blow engine work AC work too but only downster. Thank you for help.
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Sunday, May 23rd, 2010 AT 11:01 AM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
You either have a vacuum leak or a vacuum hose to the HVAC that has collapsed. Check for leaks under the dash. With the engine running, you may hear a hissing sound. Also, check under the hood for the same thing. Follow the vacuum supply hose from the control through the firewall and to the intake. I have not only found them dry rotted, but collapsed.

Let me know what you find.
Joe
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Tuesday, June 1st, 2010 AT 10:19 PM

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