FAN SPEED DOES NOT DECREASE FROM HIGH TO LOW SPEED. (Cont) -726250299

TM 9-2320-364-34-1

Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry or tools contact positive electrical

circuits, a direct short may result. Damage to equipment, injury or death to personnel may occur.

Table 2-13. EPAC Temperature vs Voltage

Values

Voltage

Water Temp. Gage

Reading

Values

(vdc)

170

175

185

190

202-204

94-96

7.3-7.7

VOLTAGE TEST

(1)

Remove 22 screws, lockwashers,

washer and access panel. Discard

lockwashers.

(2) Set multimeter select switch to

volts dc.

(3) Start engine (TM 9-2320-364-10).

(4) Allow engine to warm up to at least

175F (79C) and turn OFF

ENGINE switch.

(5) Disconnect connector MC76 from

fan control solenoid valve.

(6) Connect positive (+) multimeter

lead to wire 1936 at harness

connector MC76, terminal A.

(7) Connect negative (- ) multimeter

lead to wire 1935 at harness

connector MC76, terminal B.

(8) While assistant turns ON ENGINE

switch, observe multimeter and

check EPAC output voltages versus

engine water temperature readings

(Table 2-13).

(a) If voltage outputs are not

correct, perform Steps (9)

through (11) below and adjust or

replace EPAC (Para 6-12).

(b) If voltage outputs are correct,

replace fan control solenoid

valve (TM 9-2320-364-20).

(9) Turn OFF ENGINE switch.

(10) Connect connector MC76 to fan

control solenoid valve connector.

(11) Install inside access panel with 22

washers, lockwashers and screws.

2-217