Contents: Removal 🠛 Examination 🠛
Note: A new thermostat o-ring will be required during installation.
Removal
1. Disconnect the ground cable from the battery (on Scenic models, refer to Chapter Engine electrical equipment).
2. Drain the cooling system. The thermostat is located in the housing, on the left end of the cylinder head.
3. Where necessary, remove the air cleaner assembly (Chapter Power and exhaust systems), then release the adjacent wiring and hoses from the mounting brackets and move them away from the thermostat housing for easier access.
4. Disconnect the cooling system hoses from the thermostat housing cover (refer to Section Disconnecting and replacing cooling system hoses).
5a. Loosen the nuts/bolts.
5b. Carefully remove the thermostat housing/cover (refer to the illustrations). Where present, remove the casing gasket - it must be replaced.
6. Remove the thermostat from the housing and remove the sealing ring (refer to the accompanying illustration).
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Examination
1. Hang the thermostat on a piece of wire in a container with cold water and immerse the thermometer in the container. Make sure the thermostat does not touch the walls of the container. Bring the water to a boil - the thermostat should open. If it does not, replace it.
2. Compare the thermostat opening temperature with the data given in Specifications. The operating temperature is also indicated on the thermostat.
3. A thermostat that does not close after the water has cooled should also be replaced.
Installation
1. Perform installation in reverse order, paying attention to the following:
a) Install a new sealing ring and ensure the thermostat is oriented correctly (spring into the casing). Casing gasket (where is available) should also be replaced.
b) Finally, fill the cooling system.