overheating and then back to normal

1998 CHEVROLET ASTRO
100,000 MILES
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CRASHWELL
  • MEMBER
  • 16 POSTS
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.
Nov 5, 2011 at 11:51 AM
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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
Nov 5, 2011 at 12:00 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Check the thermostat,heater core and heat control valve
Nov 5, 2011 at 12:00 PM
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