Question about 1999 Cadillac DeVille

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If my car is overheating and ive done all the steps to purge all air out of the system but it seems to keep building back up as soon as i hook everything back up what could be the cause of this problem?

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Hello: Sounds like you have blown head gasket(s). You can buy a kit that you can use to check for sure or you can go to a repair shop and have them do it. I don't have any idea what they might charge to do that.

Posted on Oct 06, 2010

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HI, Vehicle had no heat and was overheating, so we had the heater core flushed - twice. Didn't help. We changed the heater core and thermostat. Now vehicle is still overheating. What else do we check?


You first make sure that the cooling system is completely bled/purged of any trapped air, that can cause both symptoms, it that is done and you are sure you have purged all the air out then the head gasket would be most likely leaking.

Feb 08, 2017 | 2011 Dodge Nitro

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2001 f250 overheating


Check for cracks in the system. It sounds like you have too much air in it. If you are driving, does the temperature gage fluctuate? The cap is designed not to leak, but hot compressed air will blow by it. When it does, it easily confused as coolant "purging" out of the system, but really it is steam and air. By removing the thermostat, you are fully opening the coolant cycle and the water is free to circulate. Also, with the thermostat removed, the system can't build up enough pressure because it is open to the collector bottle, which in turn is open to the atmosphere. The system is designed to work under pressure so you should keep the thermostat in. That said, try to purge the system. Remove the thermostat, plug the overflow tubes, and pull a low vacuum on the reservoir (collector bottle). You want to make sure the reservoir is about half full. My personal experience is using about 5 to 6 inches of vacuum pressure for about 30 minutes. If there's lots of air, you will see bubbles in the reservoir. And as long as you have enough coolant in it, when you remove the vacuum, it will not draw air into the system, so make sure there's enough coolant in the reservoir. I am not sure about this truck, but some vehicles actually have a purge valve on the main coolant line close to the thermostat, and usually at the highest point in the system. It looks like a Schrader valve. So, if you have this, let the car cool down, put some rags around the purge valve, remove the valve cap and purge away (like letting air out of a tire). You'll have to do this a few time after driving to completely vent the system. Finally, if you do overheat again and start spewing coolant, before the car has a chance to cool down, fill the reservoir with coolant at least up to the hot level mark. That way, when the engine (and coolant) cools down, it will draw the fluid into the radiator. Otherwise, you just end up pulling more air into the system making the problem worse. Hope this helps.

Feb 12, 2014 | Ford F-250 Cars & Trucks

1 Answer

Temperature gauge is at normal but coolant is coming out recovery tank when I drive it


You have trapped air in the cooling system, purge the air out of the system. You can do this by raising the car front end as high as possible and filling the coolant recovery tank to the brim leave the cap off, then run engine until it reaches operating temperature, then shut it down and run cold water over the radiator core, the coolant tank will be sucked dry most likely as the air is purged and replaced by coolant.

May 26, 2017 | Ford F150 Cars & Trucks

1 Answer

How to purge air from cvooling system in 1997 accourd


you have air in your coolant system which will cause this problem you should have bleeders on your thermostat housing

Mar 24, 2013 | 1997 Honda Accord

1 Answer

2003 Pontiac Grand AM V6 Overheating


You have sir in the system. You have to purge the air outdo that the thermostat can open and coolant can actually circulate through the engine.

Mar 15, 2012 | Pontiac Grand Am Cars & Trucks

2 Answers

98 Deville Northstar V-8 - can you rebuild these engines - I've heard when you have overheating problems the motor is NG???


If you have overheating problems with this engine, don't assume it's the head gaskets.

Consider the following first.....

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 close to the thermostat housing,the blockage may be there.

So before you decide to rebuild the engine, check this innocent looking little hose first.
I have solved many overheating problems on this engine and you will be surprised to know that it is very rarely due to a blown head gasket.

Jun 30, 2010 | 1998 Cadillac DeVille

2 Answers

Engine hot


First of all you need to check your coolant return bottle level, it's probably low, and needs coolant added. Heater will be starved for coolant, if level is low, thus, cool/cold air comes out. Try to add when engine is cool, to avoid getting sprayed with hot coolant. Leave cap off for a while, turn your heater on (not defrost) and let engine run up to temperature, and add more as needed while you watch level. Rev engine slightly and hold it for 5 seconds or so, every once in a while to help circulate coolant, and remove any air in system. If you have an actual rad cap, that you can remove and watch flow in radiator, that's even better, for adding and bleeding air out same way. Make sure your rad fan is working as well, and once you get it topped up, and heat back working, I'd seriously consider having a system pressure test done, as you obviously have a leak somewhere if the level went down to the point of overheating, and heater was starved for coolant. Keep an eye on that return bottle level until such time you have it checked, to avoid more damage to engine.

Dec 12, 2009 | 2002 Cadillac Sts

1 Answer

How to purge air from cooling system . I keep hearing that air in the system can cause overheating


two bleeder screws one on the thermostat housing one somewhere on opposite side of engine fill overflow bottle start engine open the bolt slowly until you see bubbles or antifreeze when no bubbles no air
tighten bolt back up and done

Nov 03, 2009 | 1995 Mercury Villager

2 Answers

My 1996 cadillac sts is overheating.. ook how do i get air out of it


There is no need to purge the air out of the cooling system as it is self purging on the northstar engine.
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank,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 further back until you locate the blockage.

Oct 21, 2009 | 1996 Cadillac Seville CA Value

2 Answers

1996 cadillac deville overheat..radiator?


Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,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.

Aug 20, 2009 | 1996 Cadillac DeVille

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