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I have a vr6 and water is gushing out of my expansion tank after a short drive there is brown gunk in tank too

I have a vr6 and water is gushing out of the expansion tank after a short drive there is also brown gunk in tank too

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  • 373 Answers

Sounds like you need a complete coolant flush. It should never be brown and gunky, ever. A good flush and pressure test will make it like new again. It's boiling back into tank because it cannot circulate properly. I would guess it may be a bad rad, or heater core. Good luck I hope this helps please rate my solution

Posted on Jan 07, 2013

Testimonial: "could i have a head gasket problem too "

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6ya6ya
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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: radiator overheating volvo 940GL 1997 model

have u replaced the thermostat? also have it checked for a leaking engine cylinder head gasket.

Posted on May 27, 2009

  • 750 Answers

SOURCE: after a short driver water comes out expansion tank

you may have a thermostate stock in the close position or a failed water pump check condition of both starting with thermostate good idea to change radiator cap and service radiator

Posted on Aug 07, 2009

bschilz
  • 2049 Answers

SOURCE: water is not circulating

Sounds like your thermostat has gone bad and needs to be replaced.
Your thermostat is located under a metal housing on the top of the engine. The upper radiator hose connects to this housing. To change the thermostat you basically need to drain the radiator after your engine is cold, disconnect the upper radiator hose from the engine, and remove the bolts from the small housing. replace the thermostat, and clean the surfaces on both sides and replace the gasket too. reinstall the housing, attach the hose, and refill the radiator. start the engine, warm it up and check for leaks, then re check the coolant level after the engine cools off again

Posted on Apr 04, 2010

Testimonial: "spot on advise to the problem "

skychief2001
  • 21873 Answers

SOURCE: hyundai coupe water leak from expansion tank

The system is supposed to be able to contain the overflow then pull the extra coolant back into the radiator when needed.
Is the overflow tank fluid level at or below the recommended level ?

Posted on Jul 26, 2012

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1 Answer

My overflow tank is boiling I have replaced the radiator fans and thermostat took my car to the shop they said my engine is bad how and it drives


First check to make sure the cap on expansion tank is tight because if air is getting in it will boil up. If there's any coffee coloured gunk in your water it will most likely be the head gasket has blown.

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I have a 2005 325i, my car started overheating all of a sudden, I noticed that I had a pin hole in the expansion tank. I bought a new expansion tank along with a new thermostat located in the bottom of the...


A BMW that is hot after only two or three miles generally has air in the cooling system. Did you turn on the key and turn up the heater to open the heater valve, and then pour water unto the expansion tank until pure water came out of the bleed screw?

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Engine overheats


i had a similar problem on a car a few months ago and this sounds like a faulty thermostat , you can remove or replace it and see how that goes

also check that the small return hose to the expansion tank is not blocked

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1996 vw vr6 engine coolant leak in front of engine


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Aug 09, 2009 | 1996 Volkswagen Jetta

1 Answer

Water leak from top of expansion tank.2000 BMW 316i se


The water (coolant) in the expansion tank will rise and fall with the engine temperature. What the expansion tank does is collect and return coolant to and from the engine. When the engine warms up the coolant gets hot, builds up pressure and opens up the radiator cap. The coolant then goes into the expansion tank. Now when the engine cools down the pressure drops in the cooling system and the pressure drop (vacuum) pulls the coolant back into the engine via the radiator cap. The radiator cap allows the cooling system to build up pressure and by doing so increases the boiling point of the coolant, but when that pressure exceeds the caps rating the cap opens and the coolant goes to the expansion valve. The cap has another part to it that when the engine cools down and a partial vacuum is created in the cooling system a "valve" in the radiator cap opens and allows the coolant to be drawn back into the engine. I would look at your radiator cap to see if any gunk or build up is on it, and check the rubber gaskets for cracks. It's easiest just to replace the cap because they are inexpensive and easy to replace (2-10 dollars). The expansion tank should have two hoses on it. The one on the bottom comes from the radiator and the one on the top (possibly part of filler cap) runs down and is open to the ground. That way if it is overfilled or becomes overfilled it will slowly leak onto the ground. When and if you change your radiator cap, make sure the engine is cooled down, remove cap and start engine and turn heater to full blast, full heat. Leave the cap off and let it run until engine warmed up. This should burp out any air pockets that may have happened when coolant was changed. Also top off the coolant in the radiator while it is running. Hope this helps and good luck

Apr 03, 2009 | 1992 BMW 3 Series

1 Answer

Low coolant


"I assume the chocolate color is an indication of maybe not water leaking into the oil?"
I'll lay $5 on it's being coolant :-)

As for the "overflow cap" or expansion tank filler cap as I would call it, in the absence of a VW engineer telling you different, I would leave it loose while the Stop Leak was taking effect, just to avoid forcing the Stop Leak into the oil system as the coolant system pressurised. If the can says "...works in ten minutes" then you could tighten it after that time.

Be sure to check the coolant level soon afterwards to find out if it has worked.

If the Stop Leak doesn't... I'd recommend getting a mechanic to find the leak and fix it. Left to themselves, things go from bad to worse.

Good Luck, D.

Jun 30, 2008 | 2003 Volkswagen New Beetle Convertible

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