Bill of Sale

66 Riviera overflow tank

I am probably missing something here, but if your talking about a radiator overflow tank, I did know they were available in '66.
 
Dealerships did offer an accessory kit to retrofit an overflow tank to '66-69 Buicks. It was GM part no 981766 which included the tank, wire cage for the tank, hose w/clamps, and radiator cap. These show up here and there on eBay and on sites selling NOS parts from closed dealerships etc. It also shows up in Olds parts catalogs of the early '70s. It was discontinued around 12/73.

The tank by itself was GM no 1239023; the radiator cap 6410570 or 6410665.

Factory installed tanks started showing up in 1970 for Buick.

Here is a thread showing installation of the tank on a '68 model:

 
Last edited:

terry march

Active Member
Dealerships did offer an accessory kit to retrofit an overflow tank to '66-69 Buicks. It was GM part no 981766 which included the tank, wire cage for the tank, hose w/clamps, and radiator cap. These show up here and there on eBay and on sites selling NOS parts from closed dealerships etc. It also shows up in Olds parts catalogs of the early '70s. It was discontinued around 12/73.

The tank by itself was GM no 1239023; the radiator cap 6410570 or 6410665.

Factory installed tanks started showing up in 1970 for Buick.

Here is a thread showing installation of the tank on a '68 model:

Thanks, guys
 
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