Thermostat: Testing and Inspection

Test Coolant Thermostat






DANGER:
- Risk of injury to skin and eyes suffering scalding from contact with hot coolant spray. Risk of poisoning from swallowing coolant.
- Do not open cooling system unless coolant temperature is below 90 degrees C. Open cap slowly and release the pressure. Do not pour coolant into beverage bottles.
- Wear protective gloves, protective clothing and eye protection.

1 Remove coolant thermostat (1)

NOTE: Installation:
- Install new sealing ring.
- The coolant thermostat must not be removed from the housing. Otherwise it will be destroyed. The housing is supplied together with the coolant thermostat for repair purposes.

Inspection
2 Heat coolant thermostat (1)
- Suspend coolant thermostat (1) from a wire in a vessel filled with water and heat the water.

CAUTION: For heating on no account use a welding torch or soldering torch as the sudden introduction of heat alters the structure of the metal!

3 Measure temperature of water

NOTE: The heating-up rate should be not more than 1 degrees C to 2 degrees C/min from about 8 degrees C below the start of opening of the coolant thermostat.

4 Heat water to the fully open temperature of the thermostat (2) and then measure the stroke

NOTE: If the test values are not achieved, install a new coolant thermostat.

5 Install in the reverse order
6 Inspect cooling system for leaks.