Question about 1992 Cadillac Seville

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HI. MY CADILLAC SEVILLE V8 4.9L '93, STILL OVERHEATING. I REPLACED: NEW RADIATOR, FAN MOTOR, THERMOSTAT, WATER PUMP. SOMETIMES DRIVES GOOD AVERAGE 180 DEGREES, BUT AT NOON INCREASE 240, 255. I DONT KNOW WHAT ELSE CAN I DO TO FIX THIS PROBLEM. THANKS.

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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
1) fuse,
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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If you have done all that, it leaves the water pump and the fan.....how long does it take for it to overheat? Does it overheat sitting at idle in the driveway?

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2 Answers

HI. I HAVE A CADILLAC SEVILLE V8 4.9L '93 135000


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Sep 02, 2009 | 1992 Cadillac Seville

2 Answers

RADIATOR.


remove radiator and power wash fins they could be blocked then install again then get a good engine flush drain water then refill with flush and water then start and drive read the flush bottle for instructions then let all out again then refil with clean water and a good coolant , remember to blead the system when filling every time you drain water etc, hope this helps. it will work.

Aug 24, 2009 | 1992 Cadillac Seville

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OVERHEATING


It is possible that there was a problem which initiated the warning but is no longer present. There are several things that could cause this. Even a vary hot day with a lot of stop and go driving could be enough to give you that warning. It could also be that something is starting to fail, like a thermostat or temperature sensor.
It it really difficult to say without seeing the vehicle.
However I can tell you that 250 degrees is on the high side. The radiator fan should turn on around 225 and off at around 215. You can check your fan be lifting the hood and starting the car. When you see the fan turn on check the temp. Then give it a few minutes. The fan should turn back off. If it just runs nonstop that's a good indication it's running too hot.
Have you checked your coolant level? You should make sure it's full and if not check for any leaks under the car. Also make sure there are no obstructions to the air flow on the radiator grill such as leaves. If your coolant level is fine and you can't see any thing that would affect the air flow then it would be a good idea to have it checked out. At the very least have the codes read. Places like Auto Zone will check the error codes for free.
Also you should check for recalls on the coolantadiator system.I included a link where you can check through.
Hope this helps.


http://www.tsbdata.com/tsb/1992-cadillac-seville-v8-300-4_9l.html



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1 Answer

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Fix the fan first because it causes overheating. Follow with radiator flush. If not, you will need to check the pump.

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