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Did a dumb thing Sunday pm. I had just changed the oil in my 82. I was checking the water in the radiator, opened the cap and it came apart. I had a new xtra GM cap still in the box. I put the cap on only to realize I put the wrong size cap on. It went on fine but now I can't get it off.
On some caps you have to push down hard to get them to turn past the locking tabs. On the C-3 the cap is in a difficult place so you have to work on turning it.