Cadillac 60 Series 1963 Shop Manual page 274

ENGINE COOLING
11-3
5. Radiator Thermostat Test
The radiator thermostat may be checked by
suspending it, with the thermostat heat control
unit down, in a small pan of water containing a
thermometer. Neither the thermostat nor the
thermometer should rest on the bottom of the pan
because of the uneven concentration of heat at
this point when the pan is heated. The thermostat
valve should start to open at a temperature be-
tween 172°F and 177°F. When the water reaches
a temperature of 198°F, the valve should be fully
open (approximately 1/2 inch).
6. Flow Test for Radiator Clogging
A quick check for a- restricted radiator may be
made by removing the radiator cap and running
the engine until it is above normal operating tem-
perature. When the engine speed is increased
from idle to 2000 RPM, the coolant level in the
upper radiator tank should not rise noticeably.
If the level rises or coolant overflows from the
filler neck when the speed is increased, it indi-
cates a restricted radiator.
7. Cooling System Flushing Procedure
1. Drain coolant from cooling system by open-
ing radiator drain cock and removing two drain
plugs from cylinder block.
2. After the drain points have been closed, re-
fill system with fresh water only, install radiator
cap, and set heater and defroster levers to maxi-
mum heat position. This opens the water control
valve and allows the water to pass through the
heater core.
NOTE: On Seventy-Five series cars, the
rear heater should also be set at the maximum
heat position.
3. Run engine at medium speed for one hour at
a temperature as hot as possible without boiling.
Cover radiator if necessary.
4. Inspect the following points in the cooling
system:
a. Radiator core for leaks.
b. Radiator air passages for plugging caused
by bugs, leaves, etc.
c. Condition and tension of drive belts.
d. Condition of hoses and tightness of clamps.
5. Drain system by opening all drains.
6. After the drain points have been closed, add
the required amount of ethylene glycol base anti-
freeze to protect engine to at least -20°F. Also
use inhibitor and sealer, regardless of whether
or not the anti-freeze used contains an inhibitor.
7. Fill system with fresh water and operate
engine to normal operating temperature to make
sure system is full.
8. Thermostat
Removal and Installation
a. Removal
1. Drain radiator until coolant level is below
level of thermostat housing.
2. Disconnect upper radiator hose at thermo-
stat housing.
3. Remove two cap screws that hold thermostat
housing to cylinder head water outlet pipe and
remove housing. Discard gasket.
4. Remove thermostat from top of cylinder
head water outlet pipe.
b. Installation
1. Install thermostat in opening at top of cyl-
inder head water outlet pipe, with valve up.
2. Position a new thermostat housing gasket
coated with gasket cement on water outlet pipe.
3. Install thermostat housing on water outlet
pipe and secure with two attaching screws.
Tighten screws to 10 foot-pounds.
4. Connect upper radiator hose on thermostat
housing.
5. Fill cooling system to proper level. Add
anti-freeze if necessary.
9. Radiator Assembly
Removal and Installation
a. Removal (Non-Air Conditioned Cars)
1. Drain coolant from radiator.
2. Disconnect upper radiator hose at thermo-
stat housing and lower radiator hose at water
pump.
3. Disconnect two transmission cooler lines
from rear of radiator at lower tank, and plug
ends of lines to prevent loss of transmission fluid.
4. Remove the two top radiator to cradle
clamps. It is not necessary to remove lower
clamps.
5. Remove radiator by lifting straight up.
b. Installation (Non-Air Conditioned Cars)
1. Place radiator in position.