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COOLill S W S T E 1 S 1C-1J
at which this occurs. Valve must be open 0.003 inch at
192°F to 199°F (0.0762 mm at 89°C to 92°C). It must be
fully open a minimum of 0.360-inch at 219°F (±3°F)
[9.14 m m a t 104°C (±1°'C)] * If faulty,
replace
thermostat.
(7) Install thermostat.
Water Pump Tests
Loose Impeller
(1) Drain radiator.
(2) Loosen fan belt.
(3) Disconnect lower radiator hose from water
pump.
(4) Bend stiff clothes hanger or welding rod as
shown in figure 1C-10.
(5) Position rod in water pump inlet and attempt to
turn fan. If impeller is loose and can be held with rod
while fan is turning, pump is defective. If impeller
turns, pump is OK.
(6) Connect hose and replenish coolant, or proceed
with further repairs.
5 0 4 7 0
Fig. 1 G - 1 0
Checking Water Pump for Loose Impeller—Typical
Check for Inlet Restrictions
Poor heater performance may be caused by a casting
restriction in the water pump heater hose inlet.
(1) Drain sufficient coolant from radiator to permit
removal of heater hose from water pump.
(2) Remove heater hose.
(3) Check inlet
for casting f l a s h o r
othei?
restrictions.
N O T E : Remove pump from engine before revn&iing n -
striction
to prevent
contamination
(pf coohmt
with
debris. Refer to Water Pump Removal.
Tempatrol Fan Test
(1) Start engine and allow it to warm up to oper-
ating temperature.
(2) Operate throttle linkage on carburetor t o gradu-
ally increase engine speed until definite decrease o f
audible fan airflow is heard.
(3) Maintain this engine speed until definite In-
crease of audible fan airflow is heard.
The Tempatrol unit is operating satisfactorily if tile
time interval between decrease and increase of the a u -
dible fan airflow does not exceed three minutes.
N O T E : The cooling system must be in good condition
prior to performing
the above test to ensure
against
excessively high radiator air
temperatures.
If a Tempatrol unit is suspected of causing an over-
heating condition, it may be tested while the vehicle is
being driven. Disconnect the bimetal spring (fig. 1C-10)
and rotate it 90° counterclockwise. This defeats the tem-
perature-controlled, free-wheel feature and t h e Tempat-
rol performs like a conventional fan. If this cures t h e
overheating condition, the Tempatrol is defective.
Fig. 1C-11
l l s i i i i i e l l i i T i i i p i t i S Spring
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Table of Contents
Troubleshooting
