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2004 Chevy Suburban heater blowing cold air

Tiny
DOUGGSF
  • MEMBER
  • 2004 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 95,000 MILES
When the heater is turned on to any setting it will intermittently blow hot and cold air. Watching the temperature gauge it will go from 210 degrees to 240 degrees. When the temp on the gauge is climbing it blows cold air when it falls back the 210 it blows hot air.

thank you
doug norris
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Thursday, November 12th, 2009 AT 8:13 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi, Doug. This sounds like a typical thermostat problem. Have you made sure the coolant is full? If it is, I would start by replacing the thermostat.

Let me know what you find. Remember, Doug, this could also just be a low coolant problem. (I hope)

Joe
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Thursday, November 12th, 2009 AT 8:22 PM
Tiny
DOUGGSF
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  • 2 POSTS
Joe thank you will try that!
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Thursday, November 12th, 2009 AT 8:29 PM

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