Question about 1992 Cadillac Seville
Ensure motor tune or other motor mechanical condition is not the cause of overheating,
I assume the motor is actually running hot, - ensure the high gauge reading is not just a gauge sender problem.
Check cooling fans are operating ok (as necessary when car warms up):- if not check
2) relay operation,
3) heat sensor switch.
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.
If none of the above fix your problem, replace the thermostat again - it is not unheard of for a new thermostat to be faulty .
Posted on Sep 04, 2009
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Take out the thermostat and drive around very close to home like around the same block in case. Drop the thermostat in pot of water and heat it up to see if it opens at all. If you are not loosing any fluids from coolant system, and radiator cap is sealed perfectly and all other fittings as well, you could have engine blockage so I would back flush with a Prestone kit by cutting in a "T" near the firewall into the heater hose. Leave the flush in for 2 days or 6 to 8 operating hours. Hit the highway and run the .....out of her with the flush in. Most likely when the motor gets as hot as you say, it is the temp sensor misread, thermostat, or low fluid level. Turn on the A/C and see if that triggers the secondary fan, and or check that front of radiator fan is working. The frontal fan must be working in hot weather. Most Cady thermostats are rated at 195*
Posted on Nov 07, 2009
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Posted on Jan 02, 2017
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