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Old 05-15-2018, 06:54 PM   #1
Nlbloch
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Default stuck radiator cap

I have a thermostat-style radiator cap that became badly corroded. I have soaked it in CLR and most of the corrosion dissolved, but I still have some crust that just won't disappear.

Worse yet, the hinged top won't open -- I can only access the radiator by taking the entire cap off.

Any suggestions on how to remove the remaining crud, and how to separate the top/bottom parts of the cap?

Last edited by Nlbloch; 05-15-2018 at 07:04 PM. Reason: Add photos
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Old 05-16-2018, 07:31 AM   #2
chap52
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Default Re: stuck radiator cap

I would try soaking it in Apple Cider Vinegar for a couple of days.
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Old 05-16-2018, 07:49 AM   #3
JBill
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Default Re: stuck radiator cap

White vinegar.
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Old 05-16-2018, 07:52 AM   #4
ryanheacox
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Default Re: stuck radiator cap

If you know anyone with an ultrasonic cleaner that would probably do the trick also
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