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1998 Cadillac SLS Car Intermittingly Overheats

Tiny
RAYOMUNDO
  • MEMBER
  • 1998 CADILLAC SLS
  • V8
  • FWD
  • AUTOMATIC
  • 52,000 MILES
Cadillac idols forever normal temperature. Driving on the highway seems to maintain normal temp. At no set time or mileage auto will overheat for a very brief period of time then return to normal temp. Have already changed thermostat, flushed radiator filled with coolant, and replaced fan relays. What could be the problem? Possibly the water pump?
Solve this I will be indebted.
Raymond
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Friday, August 21st, 2009 AT 12:37 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lets check out the water pump:

One way to test for a bad water pump is to squeeze the upper radiator hose when the engine is hot and idling. Careful, because the hose will be HOT! If you do not feel much coolant circulating through the hose when you rev the engine, the pump may be bad. The other cause might be a bad thermostat that is not opening properly (remove and inspect the thermostat), or a clogged radiator.

Ain't it could be air in the system try bleeding it if it continues to overheat get it block and pressure tested.
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Friday, August 21st, 2009 AT 12:53 PM

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