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1999 Chevy Suburban overheating after new radiator/thermost

Tiny
STEVEDAMIEN
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 118,000 MILES
Hi! Just acquired a 99 Suburban. After a pretty nasty overheat, I had the radiator and thermostat replaced. Drove very cool for around two hours on the highway. Then all of a sudden, the thermo started creepin up again. It would heat, then cool, and then occasionally reset back to normal. That only lasted for a while though, now its running as hot as possible before common sense says to pull over. Any suggestions or things to look out for would be greatly appreciated! Thanks. Steve
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Thursday, January 3rd, 2008 AT 12:03 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You might want to have the guys who put the radiator in it, pressure test the system for leaks, do you smell anything unusual?
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Thursday, January 3rd, 2008 AT 12:12 PM
Tiny
STEVEDAMIEN
  • MEMBER
  • 2 POSTS
Hi Merlin,
Thanks for getting back. Unfortunately, I'm on a Xcountry trip. So the guy who fixed it isn't accessible. I don't smell anything outside of coolant. It seems like the reserve tank is hoarding all of the coolant, exspelling what it can't hold, and letting nothing into the radiator. Any chance the guy put the thermostat on backwards?
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Thursday, January 3rd, 2008 AT 12:16 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
It's possible, but usually the thing wont fit in the wrong way, if you want to check it remove the hoyusing and make sure the spring end is to the block, also check the radiator cap, it may be weak, not holding the correct pressure.
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Thursday, January 3rd, 2008 AT 4:42 PM

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