Replacing the filter element
When replacing the filter element, be sure to remove any accumulated oil, dust, and dirt from the inside of the air filter housing. If the vehicle is operated in dusty conditions, the filter should be replaced more often than specified in "Maintenance schedule".
On 1.1 and 1.3 L engines, the air cleaner cover is held in place by spring clips. Release the clips and lift the cover. Be careful not to accidentally drop foreign objects into the carburetor (bolts, nuts, etc.). Replace the filter element (figure A:7) and put the cover back on, making sure all the clamps are closed.
On 1.5, 1.6 and 1.8 L engines, the air filter housing consists of two parts and is secured to the valve cover. To replace the filter element, unfasten the locks and slide the front part of the air filter housing forward (figure A:8). On later models, the filter housing has an additional fastening nut at the front. Replace the filter element, reinstall the front part of the housing and secure it with locks.
On injection engines, the air filter is located under the air flow sensor housing (11, Figure A:3). To replace the filter element, you need to unfasten the air flow sensor housing fastening locks and lift the entire unit up; this will open access to the filter element (figure A:10). Replace the filter element and reinstall the sensor. Make sure the locks are securely fastened.
Air filter thermostat
To check the operation of the thermostat flap, disconnect the vacuum tube connected to the thermostat diaphragm and apply a vacuum to it by sucking air with your mouth. The thermostat flap should open with a characteristic sound. If the sound of the flap opening is not heard, check the vacuum connections. On early models, instead of a thermostat, there is a flexible air intake hose, which in winter should be connected to the deflector attached to the exhaust manifold, and in summer - to the air intake on the inner panel of the front wing.
(The original text is available on the website: VWmanual)
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