Volkswagen Golf/Jetta 2 manual

Automatic air cleaner temperature control - testing
Fuel and exhaust systems - Digifant fuel injection / Automatic air cleaner temperature control - testing


1 Disconnect the hose from the vacuum unit then remove the air cleaner cover and element.

2 Check that the flap in the lower body is closing the warm air inlet.

3 Suck on the vacuum hose and check that the flap moves freely to close the cold air inlet.

4 Flap operation may be checked with the engine idling by extending the vacuum hose and positioning a thermometer by the temperature regulator. Below 20°C, the cold air inlet must be closed. Above 30°C, the warm air inlet must be closed. Between 20°C and 30°C, the flap should be positioned midway so that both inlets are open.

5 Refit the air cleaner element and cover, then reconnect the hose.


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