Overheating

PINSEEKER2

MEMBER
CADILLAC DEVILLE

I have a 1999 Sedan Deville. I recently has the thermostat changed with a 180 degree Stant. Which was reccommended by the auto parts store. I replaced the fluid with dextron II 50/50.

Since the repair the car has reached temps of 260 and shut off (prior to change the max temp was 222).

What happend? What should I look for?

All advice is welcome.

2 Replies

MERLIN2021

MECHANIC
17,250 POSTS

Start the car let it reach normal temp. See if the cooling fan comes on. If not try replacing the temperature sensor.

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Tuesday, March 27th, 2007 AT 3:15 PM

PCADDY

MEMBER
2 POSTS

You probably have a blow head gasket or crack head by now. Do you see coolant on the ground near you radiator cap accesss hose? If you do, their might be too much pressure in your cooling system cause the radiator cap access hole to open up and leak out coolant, this can be while you driving and eventually you are low on coolant and cause to overheating. You can have someone or take it to a shop to put in this blue solution in the coolant and run it up at 2000rpm for 5 to 10 minutes. Get it hot and see if the blue color change to green. If it is, you have a blown head gasket or crack head. That is what happen to my caddy. I just try this K & W nanatechnolgy permanent head gasket & crack sealer and it seems to work. I now put about 250 miles without overheating. This product is made from this company CRC industries, Napa carries it, part no. 401232. Around $20. Follow the direction explicitly in order to work. It is inexpensive solution rather than replace the whole motor.