Temperature-Controlled Radiator Fan

Years 1960–62 Models 2 Factory citations 1

Also described as Fan clutch

Documented applications

Corvette (C1 / C2)

1960 Factory-verified

$21.55; 2,711 built

GM Heritage factory kit — 1960 Chevrolet Corvette, p.6.

Impala / Full-Size

1958–1962 era Single-source

optional

This page aggregates every documented appearance of 121 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.