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Old Aug 5, 2014 | 04:09 PM
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Default Overflow Tank Cap...

Does anyone know what the material is that is used under the coolant tank cap? My cap is letting a little coolant seep out and when I looked under the cap the little round thingy that is used to seal the cap to the tank is all destroyed. This is on my 81. Looks like a thin piece of cardboard? My coolant thank is new, but cap is not.
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Old Aug 5, 2014 | 04:39 PM
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The cap on the overflow tank may be a fiber material like a cardstock. If you have coolant seeping out there then the tank is 'way too full. The overflow tube molded into the tank should handle any overfills.

Last edited by CaseyJones; Aug 5, 2014 at 04:45 PM.
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Old Aug 5, 2014 | 04:42 PM
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new cap is $10 plus shipping

http://willcoxcorvette.com/product_i...ducts_id=24201
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Old Aug 5, 2014 | 05:50 PM
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I only get a small drip after a long ride on a hot day. Thanks for the replys, I have ordered a new cap.
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Old Aug 5, 2014 | 05:52 PM
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I only get a small drip after a long ride on a hot day. I ordered a new cap. Thanks for the help.
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Old Aug 5, 2014 | 07:53 PM
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I bought a new tank and it leaked. The top opening of the aftermarket piece had to be sanded smooth and true with a flat block and sandpaper to get a good seal to the cap. No problems since.
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