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Radiator Cap Removal

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Old Apr 23, 2026 | 08:49 PM
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Default Radiator Cap Removal

Several years ago I replaced the radiator on my '82 with an aluminum one. Later (still a while ago) I tried to remove the radiator cap and could not get it off. Basically I was lazy and removed a radiator hose to fill the system enough to use the overflow tank. Today I decided to try again to remove the radiator cap and can't get it off. It will move a little but for some reason I can't get enough leverage to push it in and twist at the same time. Probably because I have gotten to weak over the years (old age). Does anybody have any advice or tips or know of a new tool that can be used to get it off? I'm afraid if I try a pipe wrench on it I'll damage the radiator and be in a world of trouble. Thanks!
-Chris
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Old Apr 23, 2026 | 09:22 PM
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Make sure it is cold, and you relieve the pressure first.

Your scenario is exactly why I use Stant caps with the manual pressure relief valve. The last time I removed a stock cap, I had to use channel-lock pliers. But that did work. Push with one hand, lefty loosey with the other.
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Old Apr 23, 2026 | 11:10 PM
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The old radiator caps can get stuck sometimes. Try and gently tap on the cap will you are turning it. My old radiator cap was always a pain to remove, so I bought an OEM replacement and it seemed to be easier to remove.
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