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1999 Other GMC Models overheating

Tiny
SHIMES
  • MEMBER
  • 1999 GMC
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 100,000 MILES
My car starts to over heat then it goes down. And is ok. There is antifreeze in the overflow but i'm not sure how much is in the radiator. So I bought some of the prestone 50/50 and wanted to know if I should add some to the radiator. Female and not sure what to do. Please help. Used to have problems with it always going past the halfway mark never really overheated but if i'm sitting in line or at a redlight it goes over the mark then back down. Why?
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Monday, August 31st, 2009 AT 5:39 PM

1 Reply

Tiny
MICKEY-D
  • MECHANIC
  • 304 POSTS
You should check the coolant in the radiator, but check it when the engine is cold. Then add coolant or water to the cold level in the overflow tank after topping off the radiator.
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Friday, January 8th, 2010 AT 4:31 PM

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