1998 Pontiac Grand Prix Cooling

1998 PONTIAC GRAND PRIX
170,000 MILES
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CHARLIE1229
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  • 46 POSTS
Should I be concerned if I have a black guck around the underside of my radiator cap. I do have overheating problems every once in a while when in traffic. So when I'm not moving and driving in the city my engine temp gets a little high.
Jun 30, 2013 at 4:14 PM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
If the vehicle overheats when you are stopped in traffic, make sure the radiator fans are turning on. As far as the gunk, I would recommend flushing the system. Also, make sure there is no oil mixing with the coolant as well as coolant mixing with the engine oil.
Jun 30, 2013 at 9:18 PM
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