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Works good as long as you hold overflow vent closed some air bubbling in the resavior

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Posted on Jan 02, 2017

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SOURCE: Bubbles in overflow tank and no heat

If you have exhaust in your radiator that means that the head gasket or one of the cylinder heads has a blown gasket or warped or cracked head or heads,you need to get the heads removed to see whats the cause as for the coolair it could be the heater isnt turning in as the vents should still blow hot air when you turn the heat on,fix the heads first then sort the heater when the big problem is fixed

Posted on Nov 13, 2009

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SOURCE: Air bubbles in overflow tank ?

Please check whether you have a broken Matrix and leaks coolant as you said on Passenger's floorboard.If you have that means that you are having low level coolant and air is winning and cause bubbles. Check the matrix ( heater under dashboard.)

Posted on Aug 17, 2012

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2002 mercury sable overheating

If its bubbling in the overflow it may have blown head gasket

Jul 24, 2016 | Mercury Cars & Trucks


How to burp your cooling system after replacing parts (works for ALL cars)

There's a common misconception that if part of a car's cooling system fails, the failing part can be replaced, the system closed up, fluid topped off, and the car will be ready to go. Many people have overheating problems, replace the offending component (thermostat, radiator, etc), top off the fluid, and then wonder why they still overheat.

This is because when the cooling system (which operates as a sealed system) is opened up and new components are installed, air bubbles become trapped in the system when it's reassembled. Coolant is added, but the bubbles displace some of the system's volume and become trapped in the cooling system.

The way to alleviate the problem is to burp the cooling system. It's easy to do, and only takes half an hour to an hour. It can be done at home very easily.

The first step is to reassemble the system after you replace whatever components are failing. Tighten all clamps, connect all hoses, and then fill the radiator or coolant holding tank, and fill the overflow reservoir to the indicated level (there's a small hose that typically runs from the radiator flange where the cap is positioned, over to the overflow container). Find the thermostat (trace the lower radiator hose back to the engine from the radiator - where it attaches to the engine is either exactly where, or very near, the location of the thermostat). Jack up the car so that the thermostat is pointed upward (the hose would be attaching at a downward angle). Now start the car.

You jack it up in this way so that the thermostat points upward. The thermostat will open downward in this position. Watch your temperature gauge as it rises to, and then beyond, the normal operating temperature. If it is rising very slowly, you can rev the engine, or hold it at 2000 RPM or so, to help build the heat. Eventually the engine will begin to heat up beyond normal and the gauge will climb. This is what you want. Allow it to climb to somewhere between 2/3 and 3/4 of the way to a full overheat, and then shut the engine off. Allow it to cool, and then CAREFULLY open the radiator cap. You'll hear a purge of pressure, and will probably see bubbling in the overflow container. Check the level of the coolant in the overflow and the radiator, top them off as needed, and repeat this procedure. Keep doing so until the car no longer overheats. Now, take it for a drive around the block a few times, and see if it overheats then (sometimes putting the engine under load will cause it to overheat even when it won't while sitting in the driveway). If it does not overheat, you are done. If it does, pull over, turn off the engine, and turn on the heat full blast (this will extract heat from the engine). Get the car home and burp it again.

Why are you doing this? Here's why. Those air bubbles in the system that I mentioned are the root of your evil. When you start the engine, the water pump spins and circulates the coolant (and air bubbles) throughout the engine. At some point, those bubbles come to the thermostat, which stays closed until the car gets to a certain temperature, at which point it opens and allows the coolant to go to the radiator to cool off. When the air bubbles get to the closed thermostat, they get stuck. In turn, having the bubbles pinned against the back side of the thermostat keeps it from opening since the system is pressurized and the thermostat can't open against the pressure of the bubbles. This is why the car begins to overheat. By waiting until you are most of the way to a full overheat, you get as many bubbles stuck there as possible.

Once you allow the car to cool enough that the coolant won't explode out of the radiator when you open the cap, you can open it. This relieves the pressure in the cooling system and allows the thermostat to open. The bubbles travel through the thermostat and hose to the radiator, burble their way to the top, and "burp" out of the cap's opening. With the bubbles out, the coolant level drops some (which is why the coolant as to be topped off), and you repeat the process since the coolant doesn't always follow the same pathway. You want to be sure that all the bubbles are removed from the system, so you do this a few times.

Hopefully this will help you with overheating problems and with diagnosing future issues. I know this is listed under Chevy cars, but that is only because I had to select something, and those are commonly owned cars. This process is important on ANY car, regardless of manufacturer or engine.

on Dec 03, 2009 | Chevrolet Blazer Cars & Trucks

2 Answers

What would cause the top radiator hose on 2005 lincoln ls v8 to blow out for a second day in a row after replacing it for just the same reason?

Overheating due to bad thermostat or bad radiator cap could cause the problem. The radiator cap vents excessive pressure to the overflow container which should also have fluid in it at all times.

Aug 27, 2014 | 2005 Lincoln LS V8

2 Answers

2004 sebring overflow boiling

is it boiling or bubbling big difference but sounds like there's air getting in system or exhaust gases more info would be a big help is car overheating ?

Aug 06, 2014 | 2004 Chrysler Sebring

1 Answer

My 2000 chrysler voyager radiator fluid bubbles in radiator overflow tank evn when cold nd when turning over. I just had head gasket replaced whats going on

I suspect a crack in the head or block. The cooling system is suppose to be closed so any air has to be coming from somewhere - if the head gasket is good then the air is likely to be coming from a crack. A pressure test will confirm if your system is not air tight. That is if you are seeing bubbles in the radiator water if you just mean you are losing water through the overflow then it might just be the radiator cap needs replacing as it is not sealing the system when it gets hot.

Jan 23, 2013 | 2000 Chrysler Grand Voyager

1 Answer

1993 ford ranger vents not blowing air

likely the vacuum bubble hose is disconnected, or has a hole in it. under the hood a spherical plastic bubble usuually only has 1 hose that connects to it, it may have 2 but most likely only one. idf this is disconnected, then it won't pull the vacuum required to close the vent doors. when this happens the defrost vents usullywork, but none of the panel or dash vents will work

Jul 24, 2012 | 1993 Ford Ranger SuperCab

4 Answers

Air bubble in coolant.

Replace the thermostat. That is the only cause of the bubbles.

Jan 02, 2010 | 2002 Chevrolet Impala

2 Answers

Bubbles in overflow tank and no heat

Is the car also overheating. This could be a possible head gasket problem. Easyly detected by doing a block test.

Nov 13, 2009 | 1997 Subaru Legacy

2 Answers

1995 jetta over heating

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

Sep 07, 2008 | 1997 Volkswagen Jetta

1 Answer

Over heating

Yep, you have to burp the radiator. Jack up the car so that the radiator cap is elevated. With the coolant topped off, start the car and let it run until it's about 3/4 of the way to overheating. Then shut it down and go have a beer. When it cools off enough to safely open the radiator cap, do so, and any air trapped in the system will bleed out.

What you're doing is circulating the coolant and the air bubbles inside. The bubbles get lodged behind the thermostat and stay there, keeping it from opening (this causes the car to heat up). When you later pop the cap off the radiator, the pressure is vented from the system, the thermostat opens, and the bubbles pass through. They'll work their way to the radiator (since you've got it elevated) and pop out the open cap opening.

Your coolant level will likely drop somewhat after doing this, as the air bubbles will be gone and the space they took up in the system is now available. You may need to add a little more coolant, so top if off (with the car back on the ground) and recap the radiator, fill the overflow to the marked point on the tank, and you're good to go.

Aug 08, 2008 | 1999 Saturn SL

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