Question about 1999 Cadillac DeVille

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I keep getting air in my coolant system causing it to overheat what causes this to happen?

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Hello, you probably have a blown head gasket. You can buy a tool with solution to check your cooling system for exhaust gases. Instructions come with it or a repair shop of your choice may do it for you. I don't know what they would charge.

Posted on Oct 05, 2010

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2 Answers

Car overheating causing fluid to come out of the reservoir


Change your thermostat. Ensure that your radiator fan is running at idle. See if your heat blows warm or not when the engine is warmed. if the heat is clod, then you have no water circulation in your engine. either the thermostat isnt opening up, or there is a blockage in your cooling system.

Jan 11, 2017 | Cars & Trucks

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Temp gage is solid red, air conditioner is now blowing hot air. Filled coolant reservoir and it emptied while driving but mechanic found no leak with pressure test. Is this a thermostat issue?


I doubt it.
A faulty thermostat would cause the engine to overheat after a few miles of driving. A faulty cooling fan could cause the engine to overheat and also keep the ac from working.
A leaking head gasket could cause overheating, and loss of coolant, but would not affect the ac.

Mar 06, 2016 | 2011 Subaru Outback

1 Answer

Where is the sensor for regulating the temperature R


There is no electronic coolant temp regulator. That is what the thermostat is for as it regulates the flow of coolant between the engine and radiator by opening and closing based on coolant temp. It is mechanical in operation and operates independently of everything else. If it is faulty and is stuck closed or partly closed you will get an overheat condition.

If you still have an overheating problem after what has been done then it could be due to one of these factors if all else is ok...

1. Air remaining in the cooling system retarding coolant flow. It is imperative that all air is bled from the cooling system or you will get an overheat condition cause by air blocks. If you still see bubbles appearing in the coolant this is an indication that there is still air in the system or you may have the issue described in 3. Manufacturer procedures need to be followed for effective air bleeding of the cooling system after radiator coolant has been changed.

2. A partial blockage in the radiator or in the engine retarding coolant flow due to a build up of debris.

3. Combustion gasses leaking into the cooling system via a failed head gasket will cause an overheat condition. This will show up as bubbles in the coolant when the engine is running and can be checked by doing a leak down test on each cylinder. You might also have some coolant escaping into the cylinders and white exhaust emissions can be an indication of this. If you have been running the engine in an overheated condition this can very easily cause a head gasket to fail and a cylinder head to warp or even crack.



Feb 25, 2016 | Cars & Trucks

2 Answers

I keep geting a low coolant indicator when it first starts in the morningalso it keeps overflowing and boiling our of the overflow tank. This happens even when ythe coolant level is below full.


Either the thermostat is stuck in the closed position...or the engine cooling system cannot pressurize...both will cause an overheat condition.
A blown head gasket can cause overheat condition as well as fluid loss (boil over)

I'd maybe remove the thermostat and either just replace it or not have a thermostat installed just to see if it still boils over. If it boils over with no thermostat installed then you're getting into possible leak in cooling system...i.e. water pump weep hole, hose or radiator leak...or a blown head gasket.

Hope this helps...

Aug 28, 2011 | 1995 Jeep Grand Cherokee

1 Answer

Just redid the head & waterpump thermostat and raditor and its still overheating


Did you replace the radiator cap? Surprising enough a bad cap can affect the flow of coolant and can cause air to get in to the system which can cause a car to overheat. It can also keep the fans from coming on. Hope this helps please leave comment.

Feb 13, 2011 | 1998 Nissan Altima

3 Answers

My 1997 Dodge Intrepid overheats. I've replaced the thermostat, and it continues to overheat. I noticed adjacent to one of the radiator hoses, a ribbed hose that is split. Could this cause the car to...


Now that you've eliminated the thermostat, it could be a number of other things. Don't drive the car too far until you've fixed the overheating problem - overheating can destroy an engine.

That split ribbed hose you see is plastic wire loom - it carries and protects electrical wires, and is not the cause of overheating.

1. Low coolant level
2. Radiator hose split/cracked, causing low coolant level.
3. Head Gasket - leaking, causing low coolant level
4. Thermostat - stuck closed (you eliminated this possibility)
5. Radiator cap - worn/damaged
6. Radiator fins - obstructed by debris/cardboard
7. Water Pump belt - missing/broken
8. Heater Core - leaking, causing low coolant level
9. Intake Manifold Gasket - leaking, worn, damaged
10. Radiator Fan Relay - faulty
11. Radiator Fan Blade - broken, missing
12. Radiator Fan Sensor/Switch - faulty
13. Water Pump - leaking, causing low coolant level
14. Radiator Fan Motor - faulty

My primary suspects would be Rad Fan Relay (#10), and
Rad Fan Switch (#12).

Oct 23, 2010 | 1997 Dodge Intrepid

1 Answer

1991 Dodge Spirit Check gauges light comes on when accelerating. Car seems to get hot according to the gauges and then cools immediately down.


The first thing you should check is your coolant level. If it is low add coolant. Next start and leave the car warm up to temperture and make sure the coolant is moving, have radiator cap off and watch the coolant. What you are probably going to find is that when the car is warming up or warmed up that the coolant will be low causing an air lock in the system. When the air locks happen you will find a overheat or running hot situation. This is due to air will not cool the sytem you need coolant so when the air hits the sensors under acceleration the gauges go high and cause the check gauge light to come on.

Feb 05, 2010 | 1991 Dodge Spirit

1 Answer

When i turn my heater on on my 2000 dodge caravan i blows cold air whyis that


Check your coolant reservoir under the hood. Your water/antifreeze mixture is probably low. If it is like many other Dodges the smart design of the coolant system on the van causes a low coolant condition to first starve the heater core of coolant before the level gets so low that you overheat and hurt your engine. Likely you will have to add coolant a few times before the system gets all the air out of the heater core and engine caused by letting it get low, so check a couple of times a day until the coolant level in the reservoir remains at the Max Fill line when checked a few different times. That will signal when the system has removed all the air from the coolant system.

Jan 09, 2010 | 2000 Dodge Caravan

1 Answer

Keep pushing coolant out of reservoir trying to overheat


Is it bubbling out like there is air pushing it? If so two thing I know of cause this you have air in your system bleed it thru the bleeder on the water pump and thermo areas this would happen if you had the cooling system drained or had a leak. Or you have a blown head gasket this would happen if you got it hot and kept driving it

Dec 02, 2009 | 2005 Chevrolet Malibu

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i have a 2000 olds intrigue thats been overheating alot lately the other day my drain plug for my radiator came on the way to work so i lost all my antifreeze on the way, i got to work and wound getting another plug to replace...the one that came out...topped off antifreeze...anyhow i go home and car overheats on the way home...i took it to a radiator shop today and they checked for, leaks, checked the water pump, pressure tested it...and they told me that the only thing they found was a airlock, but however the guy did recommend taking it to a mech and having it checked for a blown headgasket, so i go home today and i noticed my temp gauge going up and down on the way home it would get hot then cool down then get hot again...the car did eventually start to overheated so i pulled over and let the car cool down...i know this is getting frustrating, so do you have any recommendations or solutions as to whats cause the car to overheat.

Nov 25, 2009 | 2000 Oldsmobile Intrigue

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