Question about 1995 Cadillac DeVille

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Car running hot, radiator has been flushed, heater coil flushed, themostat replaced

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Air pocket in coolant system.

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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.

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

This test will kill two birds with one stone.

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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!

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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

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  • Expert
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Replace elctric fan or cluch fan

Posted on Nov 17, 2009

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3 Answers

I have had my radiator flushed, themostat replaced, new radiator cap, my car was fine for about 4 weeks then started running hot again..2007 Pontiac torrent Awd


experience has proved that flushing a radiator is a waste of effort
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It would appear your thermostat is stuck in the closed position , find where it is on your engine, drain coolant and remove thermostat housing and stat, replace housing(liquid gasket OK) and coolant. now run engine, turn heater controls to hot leaving filler cap off, top up any water to max and replace cap now warm up to temp until fan comes on. if all ok replace thermostat with a new one and new gasket, you could also flush the sytem out at the same time with a hose pipe by loosening one of coolent pipes and flush radiator.

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disconnect the heat hoses going into fire wall , put hose into one with pressure and flush as it sounds like it could be bloked in the heater core,the other thing that could be the problem be the hot ,cold switch as it restricts the flow to makes the heater hoter or colder , it might need tlc or replacing as it is manaul not elec

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try flushing your coolant system. if you have air compressor.remove hoses to heater core and try ro blow it out. also with the car running see if the hoses are the same temp. if not try blowing out the heater core. also start the car and see if the water pump is pushing water out of the hose goimg to the heater core. also a bad radiator cap could keep it from heating up.let the car run and see if the top hose gets hard to where you can not squeeze it. if you can than replace the radiator cap. hope this helps leave comment.

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My vans themostat shows it is overheating in very hot weather, >95 degrees going up a grade or > than 100 degrees. If I turn off the air the thermostat returns to normal. I have had this checked out...


Your van is 11 years old and it is time for a cooling system service. Drain the radiator and flush the cooling system. Replace the thermostat in the engine and fill the radiator with a 50/50 mix of antifreeze and distilled water. Make sure to clean the front cooling coils of the radiator and remove all bugs and debris. Make sure the cooling fans are running as they should. Anytime the A/C is on the fan should run continuously. Caution: If you have been loosing coolant with no apparent leak then you may have a blown head gasket. You might also see white smoke from the exhaust if the gasket is blown. This requires the heads be removed and new gaskets installed.

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02 Infiniti I-35 3.5 heater air not hot enough...had system flushed and new themostat..vents and blower motor working fine.


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Running hot


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