Question about 1999 Cadillac DeVille

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Drain for coolant 99 cadillac deville - 1999 Cadillac DeVille

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Lower radiator has a petcock just losen or you can always losen and remove lower radiator hose.

Posted on Jul 22, 2009

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Facing the auto, the drain plug should be on the right hand side at the bottom. Some vehicles dont even have a drain plug, in this case just take the hose loose. Run the engine until all the coolant is out and then replace.

Posted on Jul 22, 2009

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Posted on Jan 02, 2017

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SOURCE: 2002 Cadillac Coolant sensor

The engine coolant temperature sensor is located on the driver side of the engine near the rear of the engine compartment

Posted on Oct 08, 2008

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SOURCE: location of coolant temp sensor

where can locate the engine coolant temperture sensor.

Posted on Jul 29, 2009

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SOURCE: 2001 cadillac deville, overheats without loss of coolant

First, provided their are no visible coolant leaks and/or loss of coolant with no signs of leaks, I would thoroughly flush cooling system and replace coolant, then check and/or replace thermostat (you can place thermostat in boiling water to check for proper function), if you have tried these 2 steps and still are experiencing overheating you may need to replace your water pump which can be a tricky job if you're unfamiliar and try to do it yourself, however, I could walk you through it if necessary. Also visually check your radiator hoses for bulges, wear ,etc along with heater hoses etc. You may want to also check radiator fins to see if they are dirty/obstructed and clean if necessary. Let me know if I can assist you further and how it works out

Posted on Aug 30, 2009

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1 Answer

99 cadillac deville runnin hot


Look for the silly stuff. Check for things blocking off the radiator, coolant level, water pump belt, etc. If none of those help, check the cooling fan, coolant temperature sensor, fan relay and fan fuses. If everything there is working, consider a stuck thermostat, an obstruction in the cooling system itself or a failed water pump. Kind of a long shot but engine timing can also make it run hot. Hope this helps.

Jan 27, 2017 | 1999 Cadillac DeVille

1 Answer

How do I bleed my coolant system on my 2000 Cadillac deville


Use the radiator drain at the bottom of the radiator on the driver's side. You will need to remove front air deflector panel under the car to get at it. Be sure to do this with a cold engine and remove the overflow tank pressure cap first. Note that this will not completely drain the system, but should be adequate for a coolant change.

Oct 07, 2014 | 2000 Cadillac DeVille

2 Answers

Why is white smoke coming out the back of 99 deville engine


White smoke is an indication of the engine burning coolant. Possible blown head gasket or cracked head. Check your coolant level, and check your oil for any coolant in it.
I hope this helps.

Sep 14, 2011 | 1999 Cadillac DeVille

1 Answer

How do you drain coolant for 1998 cadillac deville


near the bottom of the radiator on the engine side there s a drain petcock valve you can unscrew which will drain the radiator and the motor. you can also take the lower radiator hose off at radiator and let coolant drain into pan, connect hose and refill.

Feb 25, 2011 | Cadillac DeVille Cars & Trucks

1 Answer

99 caddilac deville, clicking noise under hood when heater goes on, coolant smell,and heat blowing thru defrost only


sounds like a bad vacuum diaphram, used to switch coolant flow and/or airflow direction. this is best repaired by an expert, but can be done at home,with the proper tools and a manual specific to your vehicle.

Feb 15, 2011 | 1999 Cadillac DeVille

1 Answer

How do i drain coolant from my 99 deville


if you do not have a drain on radiator, then just pull of bottom radiator hose- caution do not do this until engine is cool other wise coolant could be as much as 200 degrees!

Feb 08, 2011 | 1999 Cadillac DeVille

1 Answer

What is the easiest way to remove and replace the engine coolant temperature (ECT) sensor on a 99 Cadillac Deville, 4.6L


disconnect the negative battery cable.
Pull the harness of the sensor.
Drain about 1/4 of the radiator fluid.
Place a rag under the sensor and use a wrench to remove and replace the sensor.

Aug 12, 2010 | 1999 Cadillac DeVille

1 Answer

I have a 99 Cadillac Deville which is overheating and I think it is the thermostat. Can I do this myself? Is it easy to get at? I do have some mechanical skills.


you need to make sure the fans are turning on to cool the engine down first,the fans won't kick on until the coolant reaches 212 degrees ,make sure your not losing coolant ant radiator is full,check it when the engine is cold,the north star engines have a flaw in the head gaskets leaking,

Jan 04, 2010 | 1999 Cadillac DeVille

1 Answer

Have a 99 cadillac sedan deville. lots of


you need to verify the dome lights are turning off before you walk away,something is draining the battery.check you car out after driving it and make sure radio and any other things all shut off.

Dec 28, 2009 | 1999 Cadillac DeVille

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