2. On carburetor models, the air cleaner is controlled by a thermostat and is used to regulate the temperature of the air entering the carburetor depending on the outside air temperature and engine load. Air can enter the air purifier through two channels: through a conventional air intake (cold air) and through a hot air manifold mounted on the exhaust manifold (hot air).
3. The air flow through the air cleaner is controlled by a flap valve located in its neck. Depending on the outside temperature and vacuum in the manifold, this valve opens or closes the openings for supplying cold and hot air.
4. The flap valve is controlled by a vacuum actuator, which keeps the valve fully open when the air temperature in the air cleaner is below a set level. As the air temperature in the air intake increases, the actuator begins to open or close the valve depending on the vacuum in the manifold. That. when the gas pedal is released or slightly pressed, the valve remains open and hot air enters the carburetor. When you press the gas pedal firmly, the valve closes and cold air begins to flow into the carburetor.
5. As the air temperature in the air cleaner rises even more, the vacuum actuator closes the flap valve, and in any engine operating mode, only cold air begins to flow into the carburetor.
6. The vacuum actuator is driven by the vacuum created in the intake manifold and is controlled by a temperature-sensitive unit located in the air cleaner.
7. The operation of the air purifier can be checked as follows.
8. Remove the air cleaner (see next section).
9. Apply a stream of warm air to the hot air inlet. At the same time apply vacuum to the vacuum hose (suck air with your mouth). Check the operation of the flap valve under different modes (with hot air/without hot air and with vacuum/without vacuum).
10. If the valve does not behave as expected (see above), check the condition and reliability of the connection of the vacuum hoses. If they are in order, then the malfunction lies in the thermoregulation system. On 1.6 engines, you can replace the temperature-sensitive unit (having first removed its locking plate), as well as the vacuum actuator and air inlet (see photos). Parts for the air intake on 1.3 engines are not sold separately, so in the event of a malfunction, the air intake assembly must be replaced.
Photo 3.10A. Vacuum hose connection (A) and locking plate (IN) temperature sensitive air cleaner unit (engine 1.6).
Photo 3.10B. Removing the air intake from the air cleaner housing (engine 1.6).
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