TM-5-2350-262-20-1

ARMORED COMBAT EARTHMOVER (ACE), M9

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL; VOLUME 1 OF 3

TM-5-2350-262-20-1 - Page 349 of 776

TM 5-2350-262-20-1

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If fan operates normally when fan switch (1) is set to LOW, but malfunctions when set to HIGH, or

operates normally when set to HIGH, but malfunctions when set to LOW, start troubleshooting at step

6.

If fan malfunctions when fan switch (1) is set to both LOW and HIGH, begin troubleshooting at step 1.

Turn MASTER switch (2) ON, turn fan switch (1) to HIGH.

If fan produces low air flow, replace driver’s ventilation fan filter (p 4-247), verify

problem is solved.

If fan produces normal air flow, go to step 3.

If panel light (3) does not come on, clean and tighten ground connector (4), securing

lead 57, verify problem is solved.

If panel light (3) comes on, and ventilation fan still does not operate in either HIGH or

LOW, turn MASTER switch (2) to OFF, go to step 2.

Step 2.

Check fan switch for power, 24VDC.

Remove three screws (5) and washers (6).

Pull instrument panel (7) out far enough

to gain access to terminals on back of fan switch (1).

Step 1.

83.

DRIVER’S VENTILATION FAN MALFUNCTIONS