1999 Cadillac SLS Overheating

Tiny
TWOBLAZE
  • MEMBER
  • 1999 CADILLAC SLS
  • V8
  • FWD
  • AUTOMATIC
  • 80,000 MILES
1999 SLS overheating. Starts and runs fine. Short highway drive or hard on gas pedal and car will overheat. Replaced thermostat - did not flush system - no change. Live in MN = cold - hard to flush right now, raidator is getting cold air. Car blows cold air when it overheats.
Tuesday, February 17th, 2009 AT 8:38 AM

4 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Any coolant loss? Excessive white smoke from exhaust? Ckeck oil look normal or like chocolate malt?
Let me know
Thanks for donate
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Tuesday, February 17th, 2009 AT 11:30 AM
Tiny
TWOBLAZE
  • MEMBER
  • 2 POSTS
No moisture in oil. No excessive moisture from exhust. The coolant level stays ok until the motor overheats and causes overflow. Thank you.
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Tuesday, February 17th, 2009 AT 2:43 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Assuming cooling fans working. Think exhaust gas superheating coolant. Have coolant checked for presence of CO. Let me know
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Tuesday, February 17th, 2009 AT 2:47 PM
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Did you install thermostat, and if so, was the air bleed at the top. My initial thought is you have an air pocket, or you have a stuck closed thermostat. It would be advised to check for combustion gases in cooling system as previously stated.
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Tuesday, February 17th, 2009 AT 9:49 PM

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