System Inspection

1. Visually inspect control valve and associated components. Check for:

- Loose, leaking, pinched, kinked, or otherwise damaged coolant and air hoses and connections.
- Loose fasteners, hose clamps.
- Excessively low or high idle speed (hot engine).
- Hard starting (cold engine).
- Poor fuel economy.
- Engine coolant - does not warm up.
- White smoke from tailpipe.

2. Exercise coolant and air hoses to determine extent of damage or looseness.
3. If a component is the obvious cause of a malfunction, repair the problem before proceeding with the next step.
4. If all visual inspections are OK, proceed to Pinpoint Tests.