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Re: Need help for '96 Jetta, 2.0L, with overheating problem.
You really can't tell much about the oil from it's color. Drain the oil into a clear container and see if you have two layers. This isn't a very good test either because water evaporates at the temperature of the oil. Sometimes the oil will get a foamy appearance, but you can't count on it. Place a cold piece of metal or mirror in front of the exhaust. Condensation is the best tell for a cracked head or leaking gasket. I've had a new pump fail because the impeller fell off inside the pump. It seemed ok, but it wasn't pumping. Check to see if there is water dripping from the seep hole in the water pump. This tells you the seal is bad and the pump will have to be replaced soon. You can pick a pump up for $60 on line with housing and $30 without. You have to take off the alternator, A/C compressor (don't disconnect hoses), and power steering pump. Then remove the metal mounting brackets for the previously mentioned items. The water pump is under the bracket and is now easily removed. You don't have to remove the timing belt cover, but it can make it easier.
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