Question about 1997 Mercury Cougar XR7

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My 1997 Cougar has a coolant problem. Every time I drive it the coolant bubbles back into the resevoir and overflows. I took it to my mechanic and the head gasket is good. I had them flush it. When I start it the coolant light comes on and I add about a quart of coolant and it goes off only to overflow again. It does not run hot. The thermostat is working.

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Is the radiator cap good? If it is, the engine is making too much pressure in the cooling system and head gaskets are the first to check. Check the radiator , be sure its getting hot, have the mechanic check the temp with a temp gun. If its not hot, its plugged up. was the cooling system clean? or rusty nasty?

Posted on Nov 12, 2010


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1 Answer

How to clean corroded coolant system in a 4.3L 2000 GMC sonoma

All that needs to be done is "burp" the system of the air bubble inside the heater core.(be sure that the vacuum lines are connected to the heater control valve)

This works for most cars and trucks:
Park the truck on a steep incline so the front is angled up at about a 30* angle.
Rev the engine a few times and then run the truck VERY hard for a few times at higher RPM.
That usually purges the air bubble out and you should get heat.
Check the coolant level in the radiator when it cools down.
Fill the resevoir ,again and see how much it takes.
Usually about 2 quarts.
After one cycle of hot and then cool,the resevoir/overflow bottle will cycle and pull the bubble out of the system.

The cheap/easy way to get the coolant clean is just to use the garden hose.Fill the radiator and then run the truck and drain it a few times.
If you do this,you will need to purge the system again.

Please recycle the old coolant. Sears and O 'Reilly's will take it,free.

Jan 19, 2013 | Cars & Trucks

1 Answer

Why is water bubbling over in my overflow

You're overheating (bubbling) and low on coolant (no heat). You might have a leak causing the coolant to run low and that can cause the overheating, or possibly the cooling fans not turning on which can also cause overheating. Either way, you should get it looked at asap before you cause damage to head gaskets or something else.

Dec 15, 2012 | 2000 Mercury Cougar

1 Answer

Coolant bubbling out of the overflow

While driving with the heat on you are taking the heat off of the coolant via the heater coil, letting the engine stay a little cooler. You might want to have your radiator cap checked, coolant level and also the flow through the radiator. it could be plugged. take it to your mechanic if you are not comfortable doing this yourself. You can be injured by hot coolant under pressure.

Nov 26, 2011 | 1995 Dodge Intrepid

1 Answer

Hi, I have a 96 Honda Civic. I have been having issues for the past 2 months now with the coolant getting so hot it keeps boiling out of my overflow container. I have to fill the radiator every time I...

I'm NOT a mechanic.. But.. Check this by starting engine with radiator cap removed, and look for flow.
Do you see a lot of bubbles? Esp when engine is still cool.. And bubbles are full of vapor? My guess is head gasket leak.. Blowing exhaust into the coolant. Gas in coolant preventing proper flow, and overheating the coolant, and simultaneously over pressurizing cooling system, causing blow out.

Are you seeing any steamy exhaust. ? Try pulling plugs and looking for extra clean one.
Good luck..

Dec 13, 2010 | 2003 Honda Civic

1 Answer

I just bought a farm fresh neon. It started right up after sitting for about a year. As it warmed up the top radiator hose was collapsing. now it seems fine but when I shut down i get water boiling in...

Unfortunately, if your coolant overflow tank is bubbling, that generally means that the head gasket is blown. The air or boiling in your overflow tank is from the heat in the head that seeps into the water jackets forcing air bubbles into your cooling system. Good luck.


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1 Answer

Overheating bubbleling in resevoir

bubbling into the overflow may mean a head gasket is gone, it may also mean the radiator or thermostat is blocked. or there is a leak
Clean and flush radiator, check the radiator fins for corrosion
pressure test coolant system
(if this is ok then)
new thermostat
new coolant

May 09, 2010 | 1994 Pontiac Bonneville

1 Answer

97 deville overheating after having to replace coolant resevoir.Once you let it cool and cycle fluid w/cap off resevoir,it will start forcefully bubbling out and center reading starts climing...

Gas bubbles in the coolant resevoir while the motor is running indicates a blown head gasket.
If in doubt, take it to a radiator shop and ask for a combustion gas check on your radiator.

I think you need the head gasket replaced.

Oct 08, 2009 | 1997 Cadillac DeVille

2 Answers

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you mention losing water out the reservior by which means? out the top or is it being sucked in through the over flow hose?

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