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Old 02-02-2024, 05:46 PM   #1
Nickelcharlie
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? about the Radiator Coolant Tank Cap

I have a 86 GMC V8. Does the cap that goes on the radiator over flow tank need to be vented? I picked a cap up from the wrecking yard today and all he had was a solid cap. It is a screw on tank. Thanks for a reply.

Last edited by Nickelcharlie; 02-02-2024 at 05:53 PM.
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Old 02-03-2024, 10:50 PM   #2
Dead Parrot
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Re: ? about the Radiator Coolant Tank Cap

Don't think it matters. A lot of overflow tanks have a built in vent at the top that directs any overflow down the side of the tank. I replaced the lost cap on my 79 Camaro with a metal Wylers bullion cap. Worked for years and a near perfect fit.
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Old 02-04-2024, 01:17 AM   #3
geezer#99
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Re: ? about the Radiator Coolant Tank Cap

Quote:
Originally Posted by Nickelcharlie View Post
I have a 86 GMC V8. Does the cap that goes on the radiator over flow tank need to be vented? I picked a cap up from the wrecking yard today and all he had was a solid cap. It is a screw on tank. Thanks for a reply.
Yes, it should be vented.
If not it could vapor lock.
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