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Overheating and then back to normal

Tiny
CRASHWELL
  • MEMBER
  • 1998 CHEVROLET ASTRO
  • 100,000 MILES
Why does my 1998 Chevy Astro van overheat & then go back to normal temp level once there's a gurgle sound from behind the dash? The coolant temp goes up so I turn the heat on to help dissipate the high coolant temp. The heater blows cold air & the temp goes up until the gurgle sounds from behind the dash.
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Saturday, November 5th, 2011 AT 6:51 PM

2 Replies

Tiny
CRASHWELL
  • MEMBER
  • 16 POSTS
Once the gurgle sound occurs(sounds like finishing up a milk shake), the heat goes back to normal & the heater blows warm air again. This cycle continues over & over but I don't want to let the engine overheat
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Saturday, November 5th, 2011 AT 7:00 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the thermostat, heater core and heat control valve
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Saturday, November 5th, 2011 AT 7:00 PM

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