Replace hoses (para. 8-25).
0 TO 1,000 PSIG PRESSURE
1. Connect transducer to valve after removing
connector (para 8-25). Do offset test.
2. Connect BLUE pressure transducer
to A W4
cable. Make sure the system under test is not
3. Turn on system and read pressure.
Measure the pressure at the valve outlet. Remove
the fan drive hose and connector from the valve body
and screw transducer into the valve. Start the engine
and look for leaks.
Replace control valve and/or fan drive (para. 8-25 or
3-60). Check to see if hoses are blocked prior to
replacing parts, and perform back flush procedure
If pressure in the fan drive hose is not at least 90 psi
(621 kPa). perform back flush procedure (para. 8-25).
Recheck pressure. If pressure is not at least 90 psi
(621 kPa). replace control valve.
ff pressure in the fan drive hose is at least 90 psi
(621 kPa). check for blockage in hose between the
control valve and fan drive. If hose is not blocked,
replace fan drive (para. 3-60).