Note: See Warnings given in Chapter 1 this Section before you begin working.
Removal
1. Drain the cooling system (see Section 1). If the antifreeze cannot be replaced, collect the drained coolant in a clean container.
2. The thermostat is located in the housing on the transmission end of the intake manifold.
3. The hoses may be left attached to the thermostat housing cover if they (or casing cover) are not replaceable. Otherwise, loosen the clamps and remove the cooling system hoses from thermostat housing (see photo).
4. Unscrew the casing cover bolts and remove the cover. If the cover does not separate from the casing, gently press it. Be careful not to damage the sealing surfaces - they are made of soft aluminum. Remember how the component is oriented in the operating position and remove the thermostat (see photo).
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Checking the serviceability
5. Inspect the thermostat to ensure that all riveted or welded joints are secure and intact. Also check that the thermostat valve stem is in the operating position and moves freely.
6. If upon inspection it is discovered that the thermostat remains open at room temperature, the component is faulty and must be replaced.
7. To test the functionality of a thermostat closed at room temperature, suspend the component on a piece of wire or twine in a container of cold water and immerse the thermometer in the same container. Make sure that the thermostat does not touch the walls of the container.
8. Heat the water and set the temperature at which the thermostat starts to open. Compare this value with the 'nth values specified in Specification. Continue heating the water until the thermostat opens fully: the temperature at which this should happen is indicated on the component itself. Remove the thermostat and measure the maximum valve lift (thermostat fully open), then let the thermostat cool down and make sure it closes completely. If the thermostat's full opening temperature is above 100°C, it will be impossible to perform the second part of the above procedure in a normal open container.
9. If the thermostat does not operate as described, gets stuck in one of the positions, or does not open at the specified Specifications temperature, replace it.
Installation
10. Install in the reverse order of removal, paying attention to the following (see photo):
- a) Before installing the thermostat, thoroughly clean the contact surfaces of the component housing and its cover.
- b) Orient the thermostat correctly when installing it into the housing (the arrow should point upwards).
- c) Use a new cover gasket, lightly coating it with sealant.
- d) Tighten the thermostat cover mounting bolts to the specified tightening torque Specifications.
- e) Make sure that the coolant hose clamps are positioned so that they do not touch other components, then tighten them securely.
- f) Fill the cooling system (see section 1).
- g) Finally, make sure that all connections and joints of the thermostat housing are tight.
(Text copied from this resource: SkodaBook.ru)
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