Question about 1996 Cadillac DeVille

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Coolant is disapearing but can find no leaks. The car overheats and will advise to shut down if you drive it 4-5 miles from cold condition.

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  • Anonymous Apr 10, 2009

    car runs hot , pressure checked radiator, changed waterpump, changed thermostat, and still runs hot and coolant disapears

  • Anonymous Apr 10, 2009

    car runs hot

  • dwn_azz_mean Apr 12, 2009

    coolant is disapearing but no leaks i have oil and says stop engine after 2 miles

  • Anonymous Apr 19, 2009

    i'm haven the same problem changed the thermostat cleaned the radiator and its running at 200-222 once i did this it hasnt gone over 222 what should it be running at ??

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If you happen to have the Northstar 4.6 L engine, prepare to spend big bucks. These engines have a problem with head gaskets and do exactly what you describe when they go bad.
Best solution is a good used engine. Even the Cadillac dealerships don't like to repair these engines.

Posted on Jul 26, 2008

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I had the same problem and I had to have a head gasket job thats the only way you can fix the problem. the job cost me 2800 dollars and thats not from the dealer which wanted 4 to 6 thousand. The problem
is that your caddy need a special kit to fix it correctly or it will happen again. It has special torque
specs that not all mechanics have the proper tools for. I was told that is very expensive and that it is
the only way to fix the problem. I had the problem fixed in 06 and have not had any problem with it
since. So good luck and I hope this helps.

Posted on Apr 25, 2009

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Going thru coolant like crazy but theres no leak. we done so much so far. we put a water pump in and a therpasat in and sencer in and intake gaskets


Well first off, since you have replaced many parts, perhaps you have air in the system. Also check the oil to see if it looks like chocolate milk or is extremely high (indicating a blown head gasket).
While system is cold, add coolant to the radiator (if applicable) and the coolant tank. Then start the vehicle and turn the heater on high heat - full blast. Let run for 15 minutes or until the engine begins to overheat or the coolant tank become empty. Let the vehicle cool down (30 minutes) then repeat until it coolant level doesn't drop or engine doesn't overheat.
Now go for a test drive for about 10 - 15 miles make sure to take hills and highway/freeway. Let vehicle cool down and recheck coolant tank and radiator. If level has gone down then something is wrong. Perhaps the thermostat is in backwards.

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2 Answers

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When the car is completely cool,check the electric fan(s) for smooth rotation.

Clean/check/change the thermo sensor,contact and wire.

===

Excavate air pocket in coolant system / check for head gasket leak

This test will kill two birds with one stone.

===

MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!

RAN THIS TEST IN A WELL VENTILATED AREA ONLY!

You will spill some coolant during this air pocket purge test.......BE KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!

===

Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .

Top of the coolant reserve tank

Let it ran for 10-15 minutes.

Monitor for air pockets escaping from coolant reserve tank.

Small amount of bubbles is OK at 1-5 minute mark

After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.

If you do not see any in rush of bubbles then your thermostat may be partially stuck or rusted badly inside the thermostat hosing.

Give the thermostat host few gentle taps.

If you see larger bubbles surfacing after 15 minutes then should do a hydrocarbon (HC) dye test to test for potential head gasket leak.

Let engine cold down and top off coolant reserve tank.

Start monitor for coolant lost

===

A coolant flush is require every 2 years or 24,000 miles.

I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.

Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.

===
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2 Answers

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Probably just low on coolant causing air pockets. Start it up with the radiator cap of and add coolant, then check to see if the water pump, intake gaskets, or coolant bypass connector on passenger front corner of the intake manifold is leaking.

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