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2004 Buick Lesabre blows cold air

Tiny
SAMRUSHING
  • MEMBER
  • 2004 BUICK LESABRE
The a/c works fine but when you cut the heater on it won't blow anything but cold air. I've checked all the hoses and the lines. What else could I look at?
Saturday, March 20th, 2010 AT 4:45 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,524 POSTS
It sounds like the heater core is plugged. If you remove both hoses, see if you can get water to flush through it using your garden hose. Spray it into both hoses so you backflush too.

Let me know if that helps. NOTE: If you can't get water to go through, it will most likely need replaced.

Joe
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Monday, March 22nd, 2021 AT 12:51 PM

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