Suburban 3/4 Ton 4WD V8-305 5.0L (1986)
Vacuum Diagram for Chart C-9C - EFE System Check - With TVS
CHART C-9C - EFE SYSTEM CHECK - WITH TVS
Test Description:
1.
Engine coolant temperature should be below 40~C (105~F).
2.
EFE valve should open above 40~C (105~F).
3.
There should be at least 34 kPa (10" Hg.) vacuum available to EFE actuator diaphragm.
4.
Valve may be seized up. It may be freed up by using heat valve lubricant (part # 1052627 or equivalent). If valve does not free up, it must be
replaced.
