Question about 2000 Volkswagen Golf

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Increasing use of water from the radiator reservoir

I have noticed that my X Reg Golf TDI 115 HP (ca 110,000 miles) is now starting to require frequent top ups to the radiator reservoir. The water pump was replaced about 10,000 miles ago.

There does not appear to be any obvious sign of a leak from the radiator or a hose.

Any idea what might be causing this?

Thanks and regards, Steve

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One thing to check is for coolant getting into the oil, which would indicate head gasket failure. Check oil dipstick and/or underneath of oil cap for a frothy brown/tan look to it. If so, do not drive the car.

Also check coolant reservoir for a leak. Evaporation is suspect, but maybe not to the point you are describing. Check coolant reservoir cap, as well as radiator cap.

Posted on Apr 26, 2010

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Since VW started using the pink coolant, visible leaks were getting difficult to find. The new coolant when it starts leaking from it's source immediately hardens to a brittle state once exposed to outside air. It would look like thick melted cotton candy. This is why you don't see any puddle under the vehicle. Check all the rubber hoses from the bottom of the radiator up to the back of the engine near the firewall, that's for the heater core inside the car. Most likely when it mixes with oil the oil cooler has a breach, but I doubt it since you didn't mention an odd coolant condition in the reservoir.

Posted on May 01, 2010

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