Hot Engine
- Ensure engine is at normal operating temperature. Disconnect hose No. 14 from control box No. 1 and install a plug in control box No. 1. See Fig 1 and Figure .
- Start engine and check that frequency valves A and B are operating while running engine at 2500 RPM.
- Frequency valves should emit a clicking sound. It may be easier to place hand on each individual valve to feel movement. If either solenoid A or B is inoperable, replace valve and retest. If both solenoid valves operate properly, proceed to step 6).
- If either solenoid A or B are inoperable, check for voltage at terminal lead wires while engine is running at 2500 RPM. If voltmeter fluctuates between 12 volts and 0 volts, replace solenoid valves and retest.
- If voltmeter indicates 0 volts, proceed to TROUBLE SHOOTING . If voltmeter indicates 12 volts and engine operating condition is abnormal, or the engine stops, proceed to TROUBLE SHOOTING .
- Reconnect vacuum hoses. Then, with A/C, radiator fan, heater blower motor, rear window defogger and headlights off, ensure that frequency solenoid valves are inoperable while at engine is at idle speed.
- If solenoid valves are inoperable, the system is okay and testing is complete. If solenoid valves do operate, proceed to TROUBLE SHOOTING .