Buick LeSabre 1965 Service Manual page 72

2 - 5 0 COOLING SYSTEM
ENGINE
sticks in the closed position,
overheating will result.
The thermostat may be removed
for inspection and test by par-
tially draining the cooling system
and disconnecting the water outlet
and hose from the water manifold,
in which the t h e r m o s t a t is
located.
If the thermostat valve does not
fully close when cold, replace the
thermostat. If the valve will fully
close when cold, test the ther-
mostat for correct opening tem-
perature by immersing the unit
and a thermometer in a container
of water over a heater. While
heating the water do not rest
either the thermometer or ther-
mostat on bottom of container as
this will cause them to be at
higher t e m p e r a t u r e than the
water. Agitate the water to insure
uniform temperature of water,
thermostat and thermometer.
The standard thermostat (180^
valve should start to open at a
temperature of 177°F. to 182°F.,
and should be fully open at a
temperature not in e x c e s s of
202°F. If thermostat does not
operate at specified temperatures
it should be replaced as it cannot
be adjusted.
2 - 2 3 WATER PUMP
REPAIRS
The water pump cover is die cast
aluminum into which the water
pump bearings are shrunk fit.
For this reason the pump can not
be disassembled and is serviced
as a unit.
a. Removal
1. Drain cooling system being
WHEN AIR CONDITIONER
COMPRESSOR BELT IS
PROPERLY TENSIONED,
READING O N J—7316 GAGE
WILL BE — 110
Figure 2-51—Belt Tension Chart - Air Conditioned Jobs (300 Cu. In. Engines)