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98 STS OVER HEATING NOW


Cadillac Eldorado

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I post a message about coolant loss and I refilled the coolant but before that my car when into Home Limp mode then I let it cool down and I refill it with some water about a half of gallon. So now my car does not over heat but the temp is running hotter it like 1 gap from the red gap. I turn the heat on at time when the needle mark goes to the red then the car well cools down and stay at the middle mark. What should I do just replace everything "waterpump, therm, cap, holes, coolant" Or where do I start. Thanks

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Why did you REFILL it with water, thats a no no.. You should have put a 50/50 mix of Dexcool in, you may now have lowered the boiling point.

First, check the coolant concentration to make sure you have a 50/50 mix, if not correct the problem.

Second, check your water pump belt to make sure it is not slipping and that the tensioner is not binding

Third, That you lost so much coolant it may take a couple of warm-up cooling cycles for the system to stabilize and pull in coolant

Fourth, you may have a bad thermostat, next time the car is cool, start and watch the coolant temp, it should go to about 215 to 220 and then drop when the thermostat, I am not sure that you will see an obvious drop with an analog gauge, but if you feel the upper radiator hose you should feel it get hot suddenly when the thermostat opens. BUT, it still could be binding...

Fifth, make sure your cooling fans are coming on

Sixth, by now you are due to FLUSH out the original DEXCOOL fill and refill with fresh Dexcool, have you done that? Dexcool is good for 50,000 miles or 5 years (this won't cause your problem but I thought I would mention it)

Don't panic, the wholesale replacing parts is expensive and unnecessary. Let us know how it turns out

Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life.

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... Dexcool is good for 50,000 miles or 5 years (this won't cause your problem but I thought I would mention it)

Hey Scotty,

I thought Dexcool was good for 5 yrs/100,000 miles...

am I mistaken?

You are correct - 5 years/100,000 miles.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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First of all you need to find the source of the leak. Check hoses and connections, radiator, surge tank, and water pump. Never add just water unless it is in an emergency. By adding water you lower the boiling point and it will overheat. Also, adding straight antifreeze will cause problems. A 50/50 mix is essential in keeping the coolant from overheating in all climates. Unless you have more money than sense, never throw parts at it and expect to get lucky and fix the problem. That can get very expensive. Check the codes, maybe a code can give you a place to start looking. Find the source of the leak and report back.

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... Dexcool is good for 50,000 miles or 5 years (this won't cause your problem but I thought I would mention it)

Hey Scotty,

I thought Dexcool was good for 5 yrs/100,000 miles...

am I mistaken?

You are correct, I am mistaken, I was more concerned with the fact that he was beyond 5 years

Early on sailors navigated by the stars at night and the North star became the symbol for finding ones way home. Once you know where the Northstar is you can point your ship in the right direction to get home. So the star became a symbol for finding ones way home or more symbolically even finding ones path in life.

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thx you guys but going out today to find a pressure tester then i'm going to flush the system when i find the leak but i have look everywhere and could not find a leak anywhere i let the car sit over night after driving it for the whole day and there was no fuild on the ground.

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i think u should check the oil if u dint have ant leaks its got to go somewhere.

my allante never overheated then one day it ran rough thought is was plug wire turneds out to be coolant in oil water was low no leaks

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advance auto says there new coolant is compatable with dex cool and is a 5 year coolant put it in my corvette with a bottle of bars leak pellets i guess we will see

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  • 1 month later...

My manual reads the original factory coolant (which is a 50/50 solution of dexcool and distilled water) is good for 5 years, 150K whichever occurs sooner.

You lost coolant for a reason. Check that out first. I would look at high pressure leaks first. If nothing shows up (note coolant falling on a hot engine will dissipate quickly but you should be able to smell it) then suspect a gasket problem. Have someone watch carefully when you start up. If you get a lot of "white smoke" that goes away quickly it is most likely a head gasket. The start should be done after you have driven with a high temperature for a while and then let the car cool down completely.

These tests don't cost you anything and if all is well then follow all of the good info you get from the experts on this board. This board is really great for good info.

BOL.

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