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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.

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Q: Where is the radiator cap on a 1990 vw passat?
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