Title: Identify thermostats, by-passes, housings, and seals.
Course: Diesel Equipment Technology I (20107-I) > Section: Diesel Engines: Servicing the Cooling Systems

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.

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?