Question about 2000 Cadillac DeVille

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Water coming from engine into overflow tank

Water keeps coming from engine into overflow tank and then onto ground. 2000 cadillac deville.

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You may be overfilling the tank. The correct level is marked on the side of the tank. If the engine is running hot you may have a broken waterpump or waterpump belt or bad thermostat. All of these items are found on the drivers side of the engine. Youtube has some great video for replacement.

Posted on Oct 06, 2012

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Sounds like an overheating problem, best to get it checked, maybe thermostat stuck closed, pluged radiator, head gasget, cracked head.

Posted on Feb 08, 2009

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Posted on Jan 02, 2017

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1 Answer

2000 cadillac deville is overheating, replaced thermostat: water pump radiator had head gaskets fixed it's saying check coolant level and it spews coolant from the overflow tank cap when hot thoughts?


Two cooling fans controlled by three relay's . If only one fan is working ,that could be a problem .
Coolant Level Sensor Description
The coolant level sensor monitors the coolant level in the cooling system and indicates if the coolant is low. This sensor is located at the base of the radiator surge tank and is not serviceable.
CHECK COOLANT LEVEL (2)
The IPC receives a discrete input from the engine coolant level switch. The engine coolant level switch is normally closed. When the engine coolant is low, the engine coolant level switch opens. When the IPC receives an open signal from the engine coolant level switch, the IPC displays the message on the DIC.

Relay Driven Dual Cooling Fan Diagnostics There are using a pontiac , by your cadillac is the same .

Mar 24, 2017 | 2000 Cadillac DeVille

1 Answer

Leaking water on 4.6 2000 deville on right side against firewall possible causes


Is it antifreeze or just water? If water, your AC system will frost up under use, which will melt and pool under the car on the passenger side (normal) after the engine stops. If antifreeze, there is a complicated cooling hose system, with some of them near the firewall. Check the overflow tank to see if you are losing coolant, and if so, check the hoses there while the engine is running.

Mar 02, 2017 | 2000 Cadillac DeVille

1 Answer

After driving my 1997 cadillac deville until temp reached aprox 212 ...I let it set and cool to about 124 ...opened the overflow tank and the water bubbled down. was the cooling system purging?


Depending on where you live in the country, 212 isn't to hot. Your high temp fans don't come on until 225-230. And what you described sounds normal as there is pressure in the system at 124.

Sep 05, 2014 | 1997 Cadillac DeVille

1 Answer

02 deville with 140k,overheats after driving,replaced water pump and thermostat,coolant seems to come out of the coolant res overflow ,can the surge tank cause this? loses heat from heater and then starts...


you may have too much coolant in it... oddly enough,. I've seen entire cooling systems (and even the engine get replaced) and it still over heated -- when in fact it was an all of a sudden the car required a larger radiator -- and the (freaky) problem was fully solved,. in your case it may be a larger holding/ overflow tank?

Best regards
Ck

Jan 05, 2011 | 2002 Cadillac Deville

1 Answer

How would i know if a head gasket is cracked or leaking if i dont see the water.for a 2000 cadillac deville


Well there are a lot of things to look for and they are .
1st the engine would sound differant slight hissing or running a little rougher on idle or pick up.
2nd if head gasket is starting to blow between 2 cylinders then you will get a back firing through the exhaust or carby {depending on what cylinder is blowing to what cylinder} and if you are loosing water then you will see it in steam form coming out of the tail pipe of the exhaust and engine could be breathing steam back into A cylinder which would also make it run a bit rough.
BUT IF all the cylinders are running well and you are loosing water and cannot find the cause then it could be blowing out of the overflow tank on the side of the engine,and check on the thermostat as that can alsogive you the same problems.
So let me know how you get on
Ron.

Jan 02, 2011 | 2000 Cadillac DeVille

2 Answers

Caddillac Deville keep running hot water keep coming back through the overflow tank


The thermostat could be bad. Run the engine cold with the cap off the bottle. If it comes out while the engine is still cold, you have a bad headgasket. Otherwise, start by replacing the thermostat.

Mar 05, 2010 | 1997 Cadillac DeVille

2 Answers

Why does my cadillac 1998 deville keep overheating?


Overheating can be numerous things: Fans not working, water pump, thermostat, overflow cap, and the list keeps going. When the engine is running and heats ups, feel the heat of the top hose, if the hose isn't hot, the thermostat is most likely stuck open and needs replaced. If it is hot we know you have circulation. The cap on the expansion tank may be defective, if it can't hold the pressure of the water, it will release at the overflow cap if the cap is bad. Also check the coolant level.

Jan 30, 2010 | 1997 Cadillac DeVille

1 Answer

Engine over heats 2000 cadallic deville northstar engine


flush your radiator first.with the thermostat out you should see the water moving if not bad water pump.this engine needs the thermostat to function properly and either a 50/50 coolant or straight coolant so it does not boil over.also make sure your fans are coming on

Sep 20, 2009 | 2000 Cadillac DeVille

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