Contents: Description ⬇ Examination ⬇
Description
1. The air filter has thermal control, the air is heated to the temperature most suitable for combustion with minimal exhaust emissions.
2. The optimum air temperature is achieved by mixing the cool air from the intake duct on the front side of the car with the hot air heated in the housing on the exhaust manifold. The proportion of hot and cold air is controlled by the position of the flap in the flow of the air filter intake duct, which is controlled by either a vacuum diaphragm or a wax block. The vacuum diaphragm is controlled by a temperature sensor located in the air filter housing (see illustration).
Examination
3. To check the operation of the air temperature control, the engine must initially be cold. First check the position of the flap. On the vacuum regulator, remove the air cleaner cover and check that the flap is open, allowing only cold air from outside the car. Then start the engine and check that the flap has now moved, allowing only hot air from the exhaust manifold.
On a wax regulator, the flap should be positioned so that only hot air from the exhaust manifold passes through.
4. Temporarily install the cover on the vacuum regulator.
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5. Start the engine and warm it up to normal operating temperature.
6. On the vacuum regulator, remove the air cleaner cover and make sure the flap is now positioned so that only cold air from outside the car passes through. In cold weather, hot and cold air should mix. On the wax regulator, use a mirror to check that the flap is positioned the same as on the vacuum regulator.
7. If the flap does not function properly, the air filter housing must be replaced. Note that the vacuum thermostat can be replaced separately.
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