Question about 2003 Volkswagen New Beetle Convertible

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Low coolant I just rechecked the oil filler cap. The gunk is chocolate brown not so light colored as I thought. I did notice some frost on the cap in the sub zero weather this winter. the brown gunk is very tarry feeling. I think I will try the stop leak. I should leave the overflow cap loose after adding the stop leak? I assume the chocolate color is an indication of maybe not water leaking into the oil?

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"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 " 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.

Posted on Jun 30, 2008


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Posted on Jan 02, 2017


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Hi i hav read about water in oli & i hav 2E Tazz & i have my car for 4 year's & every time when i start my car there come black water out of the exhausts & that is for 4 years now what can be the prob

on initial start up of an engine , water and water vapor coming from an exhaust pipe is normal-- black water is just carbon or soot in the water
it is condensation formed during the combustion process in a cold engine
--very noticeable on cold mornings as spots of water and steam
as the motor warms up , the hotter combustion temperatures and hot exhaust system reduces visible steam to a point where it is not noticeable and the water has boiled off
as to water in the oil--- normal sump oil is light brown when new to dark chocolate to black as it gets old
if there is water in the sump oil the color is normally a grey color and has a condition like curdled milk
to add further for your pre start checks --- the coolant should be a bright green or red --depending on the anti-boil/freeze in use--- but if you have an automatic with a faulty oil cooler in the radiator tank, the coolant color goes to a pink.

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Condensation under oil filler cap

Car spitting some oil on the filler cap may be normal, if it spits out oil from the cap there is a problem. check oil level and eventually have an oil change.

Jul 31, 2008 | Mercedes-Benz E320 Cars & Trucks

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94 Fleetwood lt1 brown crud in coolant reservoir

Looks like mud ? What type coolant have you added ? Take the radiator cap off an look into it , do you see the same ? Have you ever had the cooling system flushed ? There was a problem with people adding green coolant to GM - Dex-cool ,orange ! Clog's the passages in radiator ,inside the engine , heater cores etc... Pull the oil fill cap on the valve cover an look at the under side of the cap , do you see brown frothy looking goop ? Coolant getting into the oil ! Why it called DexKILL

Sep 19, 2016 | 1994 Cadillac Fleetwood

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1999 chevy luminapassed smog with flying colors nothing wrong went to change oil it was like a light chocolate color

What is wrong with the oil?

If it looks like chocolate milk then you will have a leak in the cooling system that is allowing coolant to escape into the oil. If your cracked radiator has been replaced and you check the coolant level you will find you will need to top it up.
(Take off the radiator cap when the engine is cold and you might also find evidence of oil that has escaped into the coolant and has attached itself to the radiator cap and the neck of the filler)..

White smoke generally occurs when coolant escapes directly into the combustion chamber not when it escapes into the oil passages in the engine and contaminates the oil.

What you need to track down now is where the coolant is getting into the engine oil which may be through a blown head gasket or a cracked cylinder head or both. If you had a crack in the radiator when driving the car the coolant will escape very fast because it is under pressure. Overheating the engine even for a short while can be enough to cause damage and heating up the engine is unavoidable unless you pick up the coolant leak very quickly.

The first thing I would be doing is to check for a failed cylinder head gasket because I would want to eliminate that as the issue if it has not failed.

In some engine designs coolant can leak into the oil via a failed intake manifold gasket and in that event it is a much simpler repair. I am not sure if that can be an issue in the engine you have fitted in your car but it is something you should check out..

In any event there is a very good video here on ways to identify if you have a blown head gasket. If you do not then you will most likely not have cracks in the cylinder heads either. But one way or the other you need to track down the internal coolant leak as engine oil contaminated with coolant will cause engine damage if not dealt with and the problem repaired..

12 Ways of How To Test Blown Head Gasket Compared PART1

Also you might like to read this............

What to Do When Your Engine Overheats

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1 Answer

Driving home last night my car was overheating and going in to limp mode. i also noticed a few days ago that the heaters only work while on the motorway doing 70 mph.

Sounds like you're low on coolant. That's not good, because it being a sealed system, you should never have to add coolant. The level should always stay full. If adding is necessary it is almost certainly leaking somewhere. If you can't see any external leaks on the engine or hoses or radiator, check your oil sump for coolant contamination: pull the oil dipstick and look carefully for milky brown swirls in the oil. That's the color the coolant gets in the oil. Take off the oil filler cap and check there too for a brown sludge. Just precautions because worst case scenario, if that's where your coolant went, it probably means a costly head gasket job.

If it turns out to be low just from neglect, you may be alright, but you need to keep watch on the coolant level for a good 2 weeks or more to be certain it is not losing coolant somewhere. Be sure and bleed the air out of it too, when refilling coolant. I don't think that was what happened, an air lock, as the cause of your overheating, though.

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If you get an overheating problem, the pressure in the system increases, The radiator cap has a pressure release valve to stop further damage to the system and release the pressure which gives the impression of coolant leaking out. Possible causes of overheating:- Low coolant level (a leak in the system). Thermostat not opening (need to replace). Cylinder head gasket leaking (need system pressure tested) indication of head gasket can be water in the oil, look in the oil filler cap, if there is a creamy brown sludge, indicates water present. Weather if the weather is hot, possible electric cooling fan isn't working. There is a possibility that the seal on the radiator cap is at fault (rare)

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1 Answer

1998 1.4 polo running fine but a bit creamy inside oil filler cap, is this sign of head gasket going?

Normally your oil will have a light chocolate color to it and this usally indicates a busted head gasket or cracked head if you are only seeing it inside the oil cap I wouldnt suspect it I have seen oil caps that develope this light chocolate or creamy color on the underside of them and can only attribute it to condensation being built up on the underside of the cap mixing with whatever little oil is on the cap usally changing the cap takes care of this I hope this helps you in some way.

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1 Answer

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