I have a 2000 model vw beetle,the temp light came on and after letting it cool down,i opened the water resevoir and it was full of a thick creamy tan coloured liquid,looks like oil to me.the mech says the gasket is ok,he says it might be something to do with the radiator on the auto gearbox.does this make sense and what solutions do you have,please help urgent.
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Re: over heating and oil mixing
Yes sounds good to me also check the oil cooler which is what the oil filter screws onto with water pipes connected as well,as normally the auto connection into the radiator doesnt give problems when its copper but a lot of new cars use plastic and they are absolutly useless.this oil cooler on top of the oil filter is often damaged by heavy handed mechanics hammering a screwdriver into the oil filter to remove it and make a hole into the oil cooler .
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vw beetles do not have a temp gauge so instead when the car is cold the light is blue at normal temp no light when over heating or low coolant red light and it beeps, you need the right coolant for your vw it is pink in color and some napas have it (Not DEX Cool) and you probably have a coolant leak, usually a plastic flang at rear of cylinder head goes bad
does it sound like there is any compression. remove cover on the right side that covers t-belt see if belt might have broken. if cooling system failed could have blow fuse for cooling fans. causing overheating.
Not certain, but you may be referring to the blue light that indicates when the water temperature in the cooling system is "cold". It's typically blue when the car first starts, then changes color when the water temperature rises. If the light remains blue the water temperature isn't heating up, and you may want to have the cooling system flushed and checked. Depending upon the cars mileage, it may be time to flush the cooling system anyway.
that will the next thing.
make sure the water is restricted at any point, from the lower hose to the engine back to the upper hose and back to the radiator.
the best way to check that out is to flash the radiator. you can see the water change color and feel the engine temperture.
as stated, gotta be the thermostat... when the water reaches a certain temp this valve must open to allow coolant to flow thru the radiator or the water in the engine will get too hot and cause significant long term damage. It's good that you pull over immediately and let your engine cool off. A good emergency remedy to get the car to a safe place or a repair facility, is to run the heater at full blast. effectively using your heater core as a radiator. not ideal but will get a you a few more miles down the road.
water pump. water pump. water pump. i am a vw dealer tech and on 2.0 and 1.8t beetles the water pump impeller is plastic, and what happens is usually another component, fans, fan control module (under battery tray), thermostat, fails and because the impeller is plastic with just one overheat the plastic becomes brittle and shatters, pull the water pump out and you will see the impeller in 3 or 4 pieces. replace water pump and make sure t stat opens, fans come on (a/c off) and proper water pump flow.