The thermostat of the engine cooling system is removed for inspection or replacement
The main symptoms of an engine cooling system thermostat failure are: - engine overheating or insufficient engine warm-up
For ZMZ-406 engine
Drain the cooling system.
Disconnect the two hoses from the fittings of cover 1 of the thermostat housing.
Remove the two screws 2 and remove the cover 1.
If you need to remove the thermostat housing, you must disconnect the wires from the sensors 5, loosen the clamps 4 and unscrew the two bolts 3, remove the thermostat housing.
Remove thermostat 1 from housing 2.
Install the new thermostat in reverse order.
Engine 402
- 1. Drain the cooling system.
- 2. Disconnect hoses 1 and 2 from the cover 6 of the thermostat housing, after loosening the clamps.
If you need to remove the thermostat housing, disconnect hose 3 and wire 4 from the coolant temperature sensor from it.
Unscrew two bolts 5 (the second bolt from the bottom of the housing) and remove the thermostat housing.
- 3. Unscrew the two screws 1 and remove the cover 2. Remove the thermostat 3 from the housing.
- 4. Install the new thermostat in reverse order.
