Question about 2002 Cadillac Deville

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Oil in coolant

I had my oil changed in I see a lot of oil in my coolant,before it was a ferry liitle floating,a mechanic told me to have my radiator flushed n oil changed,my car isn't running hot nor is the oil level lower,I need help before I start spending a lot of money in this car

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  • Contributor
  • 33 Answers

Possible internal intake gasket leak. make sure its not trans fluid from the cooler in radiator

Posted on May 11, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

CGYaprentice
  • 58 Answers

SOURCE: dash says engine coolant hot

Did you change you ECT (ENGINE COOLANT TEMPERATURE SCENSOR) ?

Posted on May 29, 2009

  • 396 Answers

SOURCE: Coolant leaks, oil pan gaskets leak started

Check temp control sending unit and thermostat.

Posted on Jul 17, 2009

  • 69 Answers

SOURCE: Same problem , car has only 86,000 miles

replace that thermostat again...flush radiator any way...then see how it runs...

Posted on Aug 28, 2009

Mustgo
  • 2359 Answers

SOURCE: car running hot

Air pocket in coolant system.

====

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

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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.

===
Please post more information by clicking the comment link on the top right corner.

DON'T FORGET to RATE ME if my tip is helpful to you!

Posted on Dec 05, 2009

Kravcar
  • 192 Answers

SOURCE: will car run hot if oil change is needed

The oil has to be very old and contaminated to cause any degree of overheating, so I don't think that is your problem.

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.

Posted on Apr 25, 2010

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