General Motors THERMAC Air Cleaner: Description

The Thermac Air Cleaner assembly is installed to reduce amount of carbon monoxide in exhaust gases. This reduction is accomplished by regulating air temperature at air cleaner inlet. System consists of air cleaner assembly with integral damper assembly, temperature sensor, vacuum motor, vacuum hoses and exhaust shroud with connecting pipe. Oldsmobile uses two different temperature sensors, a green one with 1 and 4 barrel carburetors and a blue one with 2 barrel carburetors.