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1999 Cadillac Seville overheats

Tiny
DSEW1962
  • MEMBER
  • 1999 CADILLAC SEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 120,000 MILES
This car will not overheat while idling but as soon as you put it in drive it starts overheating. Have changed the radiator, thermostat and have done a tuneup. No water in oil. Unhooked catalytic converter to see if it could be clogged. Heat does not work but ac does not sure if this is related.
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Saturday, July 5th, 2008 AT 6:38 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have it block and pressure tested-do the block first to pinpoint a combustion leaking into the cooling system or a gas analyzer to sniff for hydrocarbons at the radiator fill neck.

Pressure test: do not do a pressure test if there's leakage at the headgasket this might cause coolant into the cylinders and lock it up or bend a connecting rod if cranked thereafter. The headgasket should be repaired before doing the pressure test.

If the block and pressure test passes check the following: Thermostat, Pressure test the Rad. Cap, Clogged radiator, Fan clutch, Radiator electrical fan, collaspe hoses, water pump.
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Saturday, July 5th, 2008 AT 11:14 PM

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