Removal & Installation: Thermostat: Inspection
- Make sure that air bleed valve of thermostat is clean.
Should this valve be clogged, engine would tend to overheat.
- Check to make sure that valve seat is free from foreign matters which would prevent valve from seating tight.
- Check thermostat seal for breakage, deterioration or any other damage.
- Check thermostatic movement of wax pellet as follows:
- Immerse thermostat in water, and heat water gradually.
- Check that valve starts to open at specific temperature.
- If valve starts to open at a temperature substantially below or above specific temperature, thermostat unit should be replaced with a new one. Such a unit, if re-used, will bring about overcooling or overheating tendency.