Identification should include
- verifying the operating temperature of the thermostat
- testing the opening temperature and maximum movement of the thermostat, according to manufacturer guidelines
- checking the thermostat housing for chemical build-up or cracks
- examining the cooling system hoses and clamps
- replacing parts, as needed.
ASE 3: I. Diesel Engines: E. Cooling Systems (P-1)
Process/Skill Questions:
- What are the results if a thermostat fails to open? If it remains open all the time?
- What is the purpose of the coolant by-pass line or passage?
- What causes the chemical deposits found in a cooling system?