DA9vid
**Former** Civic Owner
Jetta's don't. They use a closed system. The have a reservoir that you fill and the hose runs from that to the radiator. I had a 91 Jetta that had no radiator cap, so yes some cars DO NOT have rad caps. Here is a pic. You fill it in the blue cap on the round reservoir, the the tube runs underneath to the radiator. See, there is no rad cap.RX7 have them. I'm sure all cars do. The cap is probably just located somewhere else. It's probably a DSM radiator. DSM's don't have radiator caps on the actual radiator
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