Thermac - Thermostatically controlled Air Cleaner

General Information

Info - L4 models only

A temperature sensor in the air filter canister controls vacuum which then moves the valve. The valve combines cool exterior air and warm air from around the manifold. If it isn't working right, the intake air temperature won't match what the ECM is programmed for and your engine won't run right.

From: Ludis Langens

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