Mark VII V8-302 5.0L HO (1986)
Exhaust Heat Control Valve: Testing and Inspection
Bimetal Type
A. Inspect valve assembly for any abnormal condition. Service or replace as necessary.
B. Lubricate the valve with COAZ-19A501-A or C4AZ-19A5O1-A graphite lube or equivalent.
C. Check valve and thermostatic spring operation by manually rotating the valve shaft. Valve must be free and return to the closed position when cold
(Rotunda Choke Tester Model 090-00001 or equivalent may be used if necessary to cool bimetal).
Vacuum Operated
Apply 33.77-67.54 kPa (10-15 in-Hg.) vacuum to the vacuum motor using a hand vacuum pump and trap for 60 seconds. The valve must close and not
leak more than 6.75 kPa (2 in-Hg.) and open when the vacuum is released. it it does not operate in this manner replace the valve.
