C6 Plastic Coolant Surge Tank Longevity.

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Jul 21, 2024 | 06:56 PM

Corvettta

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From: Ann Arbor MI

C6 Plastic Coolant Surge Tank Longevity.

Hello. I’m wondering about the longevity of the plastic coolant reservoir expansion tank on a 2007 C6 with 120000 miles.
would it be wise to replace it ? I’m always wary of plastics longevity in heat for 16 years.

Jul 21, 2024 | 07:05 PM

Spaceme1117

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From: Erlanger, Kentucky

I have a 2011 GS and I replaced mine recently. 45K on the clock. Mine was a bit yellowed and had some staining on the inside. Made it a bit difficult to see the coolant level.

It's pretty cheap so might as well replace it.

Jul 21, 2024 | 07:17 PM

Corvettta

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From: Ann Arbor MI

Thanks for the response. Where would you buy one to ensure it’s not a Chinese knockoff and also speaking of Chinese knockoffs where would you but the block coolant drain plug on the right side just above the starter?

Jul 21, 2024 | 07:28 PM

Spaceme1117

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From: Erlanger, Kentucky

Quote:

Originally Posted by Corvettta

I purchased a genuine GM tank from RockAuto: https://www.rockauto.com/en/moreinfo...=10457&jsn=559

For the block drain plug, ICT Billet sells them:

Amazon

Jul 21, 2024 | 09:01 PM

Aardwolf

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From: WI

Kinda tough to say hmm maybe three hundred years. It's not getting UV so how long does that type of plastic last?

Jul 22, 2024 | 02:14 PM

Corvettta

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From: Ann Arbor MI

Back to the block drain plugs, mine had a steel plug on the left side . The torque is 50 nm.

All new ones have brass plug.

Same torque?

I wonder why the change.

Jul 23, 2024 | 02:22 PM

bynummustang

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Quote:

Originally Posted by Corvettta

Back to the block drain plugs, mine had a steel plug on the left side . The torque is 50 nm.

All new ones have brass plug.

Same torque?

I wonder why the change.

My guess is why would you want to use a harder metal (steel) when threading into the block if you're not looking for clamping force. Block plugs need to seal liquid. Brass being soft is good for this use case.