Figure 3.3. Air filter assembly - 1.6 and 1.8 L engines
1 - suction pipe; 2 - clamping belt. 5 - temperature regulator; 4 - rubber shock absorber; 5 - temperature sensor bracket; 6 - temperature sensor; 7 - filter insert; 8 - nut securing the body; 9 - washer; 10 - nut; 11 - washer; 12 - bracket; 13 - washer; 14 - nut; 15 - warm air suction pipe; 16 - spacer sleeve; 17 - clamping belt; 18 - crankcase air outlet pipe.
1. Remove the retaining clamps and disassemble the low pressure unit and drive pipe, leaving the low pressure pipe connected.
2. Hang the thermometer in the air flow through the drive channel, then start the engine. In the temperature range between -20°C and +20°C, the regulator valve should be maximally open to let in hot air near the exhaust manifold. At temperatures above 17-20°C, the valve should close the hot air supply.
3. The movement of the regulator valve throttle can be checked by creating a reduced pressure in the reduced pressure inlet.
[The original can be viewed on the portal VWManual.ru]
4. With the engine running and the intake air temperature above 17-20°C, disconnect the low-pressure flexible hose from the low-pressure unit. The regulator valve throttle should be fully open for a maximum of 20 seconds.
5. If the regulator unit does not operate normally, it must be replaced together with the temperature sensor (Fig. 3.3).
6. Install the low pressure unit and the air filter drive pipe.
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