Question about 2004 Volkswagen Passat

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My passat's coolant is rusty and extremely thick Why?

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Age of coolant and breakdown of material in the engine block. Also use of non distilled water in the coolant.

Posted on May 10, 2010


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Coolant is a rusty milkshake consistency

if you do not see any obvious leaks under the car and you are still adding water to it, you might have a cracked head gasket which is causing coolant to go into cylinders. If this is the case, this can cause more problems.

Jun 28, 2012 | 2001 Volkswagen Passat

1 Answer

Dipping of rusty water

yep heater core in dash leaking,sound like heater core rusted out if you used straight need to have radiator and engine block flushed because rusty water is in the entire coolant system, you need flush coolant system replace thermostat add 50/50 antifreeze and water mixture never run straight water because straight water in winter weather will cause water freeze up in cylinder block and crack cylinder block you need antifreeze mixture in coolant system to keep coolant from freezing.

Dec 01, 2011 | 2005 Kia Spectra

1 Answer


Your local auto parts store has a coolant flush liquid that youo run through your radiator. Be very cautious though. If there is any stop leak or anything it will not only clean it out, it will open the leaks again.

Jun 02, 2011 | Ford Taurus Cars & Trucks

1 Answer

Lossing antifreeze but no puddles we think its the antifreeze intake gasget?

if no puddles or no keaks you can see, then its probably your head gaskets, or the intake gaskets leaking. look all around intake to see if you see any leaks. if you do its your intake gaskets. how does the coolant look! on my car when the intake gasket was leaking, it made the coolant look milky and a chocolate type mixture. so check it out first, the intake gasket. Coolant may flow through the gasket to the inside of the engine and mix with the oil. Pull the oil dipstick out and look at it. Oil mixed with coolant will have a thick consistency. Examine the oil filter cap for any rusty-looking residue. good-luck.

Feb 14, 2011 | 2000 Pontiac Grand Am GT

1 Answer

Where is a knock sensor soposed to be located on a 1991 passat

look on the left hand side at the front of the bell housing, and is held on with a terrible allen bolt that is probably rusty and will be difficult to get out....

Jan 14, 2011 | 1991 Volkswagen Passat

2 Answers

VW passat coolant warning light on

There's a level sensor plugged into the bottom of the coolant reservoir. Unplug it and clean the contacts with electrical contact cleaner. If that doesn't do the trick, replace the sensor.

Dec 01, 2009 | 2005 Volkswagen Passat

1 Answer

Water coming out of hole behind the head theres a plug with wires hooked above it

may be the freeze out plug . if the plug is round about a 1/4 to3/4 of an inch thats probably it , these plugs will rot out and leak if the anti freeze concentration is too low and your coolant is rusty looking. or not maintained or changed. sometimes difficult to replace plug if there is not enough clearance to remove and install it. I hope this was very helpful. good luck

Sep 29, 2009 | 1999 Volkswagen Passat

1 Answer

Thick black oil in coolant expansion tank

that sounds really serious there shouldn't be oil anywhere in or near that, sounds like you could have a cracked head gasket which will cause oil to leak into coolant and coolant to leak into the oil, if u can drain the sump oil and see if there is water in the oil if so you've got a big problem and is really hard to replace if you don't know anything bout dismantling engines and unfortunately it can cost up 2 a couple thousand to get a mechanic to fix

Sep 16, 2009 | 2002 Volkswagen Passat

1 Answer

Thick black oil in coolant expansion tank

If you have the oil in the tank it usually means a blown head gasket.Get a compression test done on the motor, but first get a radiator pressure test.This is cheaper and will show a similar result.Water will be pushed into the oil.If the water test is not conclusive,then get the compression test on the motor.Hope this helps

Sep 16, 2009 | 2003 Volkswagen Passat

1 Answer

Please help

possible coolant blockage in engine. Fan does not run because temp sensor is located is part of coolant that is not getting hot. Describe loud noise please. You are likely facing terminal engine failure, however, try back-flushing coolant passages on engine. This may be tricky, but you could remove thermostat and try running engine, or fabricate a rubber stopper on the end of a garden hose to put in hole where thermostat goes, remove lower radiator hose and flush water as hard as possible. A big rust flake could be blocking coolant flow. PS: have you recently had any work done on cooling system? I have seen some stupids use so much sealant when replacing a water pump that excess blocks coolant flow. Lots of luck. "The rusty one"

May 23, 2008 | 1997 BMW 318

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