ok...time to study..
everyone should have a manual for their vehicle, and a professional shop manual should be available at the library in the reference section for FREE...make copies of the right pages and fix your vehicle like a PRO! :)
good luck
Dave :) Having a manual is nice. But. There is no radiator cap. There is a white bulb or reservoir by the fire wall on the drivers side under the hood. Probably has a black screw in cap. With the car cool, unscrew and fill with premixed antifreeze, let it bubble down and keep adding til it quits bubbling. If you need to drain the radiator, you have to pull the bottom hose off the radiator.
The radiator cap in a 1990 VW Passat is located under the hood in front of the driver side windshield. It looks like a little ball(Clear or white). The cap on this is it. This is also the radiator overflow tank.
http://www.fishh2o.com/Misc/Misc/Passat%20Radiator.html
Please clarify. Are you looking for one, or are you asking for information about one?
There is just an overflow container, no radiator cap. Remember, pink or blue fluid only.
If you have a 1999 Passat V6, the coolant temperature sensor is located in the lower radiator hose.
Top left side of engine silver cap hose on to it
The radiator is located beneathe a plastic cover in front of the engine, between the headlight housings. Follow the upper radiator hose to locate it.
It is an engine cooling fan that cools the fluid as it passes through the radiator.
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there isn't a radiator in a vw passat. Vw's in general don't have radiators. Usually you can find a round container, shaped like a ball, with a black cap under the hood near the windshield washer container. It should be about half full of greenish antifreeze. To fill, simply unscrew the black cap when the engine is cold and add your antifreeze up to the full mark, it is hard to see, but half full is where the full mark is (at the seam). The antifreeze needs room to expand when it gets hot so dont fill it to the top. The hose on the bottom of that container goes to the engine and then to the radiator. NEVER take the cap off when the engine is hot. It could explode in your face. This works for all Golfs, New Beetles and Passats. And yes they all have radiators. KGP 484
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