TM 5-3805-262-20
3-7. COOLING SYSTEM TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE OVERHEATS.
Step 1.
With engine at normal operating
speed for two minutes and return
Unlock and open radiator cap
access panel.
Carefully cover radiator cap
with a cloth and rotate coun -
t e r c l o c k w i s e t o f i r s t d e t e n t.
A hissing noise from cap and
filler neck should be heard
indicating that system is
p r e s s u r i z e d.
a. If hissing sound is not
heard, go to MALFUNCTION 3
(page 3-58).
b. If hissing sound is heard,
r e i n s t a l l r a d i a t o r c a p,
shut off engine, and go to
step 2 below.
Step 2.
Remove engine side panels
(page 9-14).
Check alternator drive belts
for proper tension. Press
each belt midway between fan
pulley and crankshaft pul-
ley. Belts should deflect
approximately 1/2 inch.
temperature, run engine at high
to idle speed.
a . I f b e l t s d o n o t d e f l e ct
1/2 inch approximately,
adjust (page 5-5) .
b . I f e a c h b e l t d e f l e c t s 1 /2
inch approximately, go to
step 3 below.
3-53
