Volkswagen Golf/Jetta 2 manual

Inlet air pre-heater - testing
Fuel and exhaust systems - Digijet fuel injection / Inlet air pre-heater - testing

1 The inlet air pre-heater is fitted to engines manufactured from September 1989.

2 A hot air blower such as a hair dryer can be used to test the pre-heater. First release the retaining clips, lift the lid from the air cleaner unit and remove the element - see illustration, Section 32, Chapter 1.

3 With the engine cold and with the air temperature around the pre-heater between 5 to 15° C, the warm air flap valve must be seen to be open. On heating up the air temperature in the area of the air inlet valve to over 20°C, the valve should be seen to close.

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