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1C-12
COOLING SYSTEMS
(13) Install radiator attaching screws.
(14) Install charcoal canister and bracket, if
removed.
(15) Position fan shroud and install screws, if
removed.
(16) Install draincock.
(17) Remove plugs and connect transmission fluid
cooler pipes, if disconnected.
(18) Install lower radiator hose using replacement
clamp.
(19) Install upper hose using replacement clamp.
(20) Install coolant. Use correct mixture.
(21) Connect coolant recovery hose, if removed.
(22) Install radiator cap.
Radiator Pressure Cap
The radiator cap consists of a pressure valve and a
vacuum valve (fig. 1C-9). The cap has several functions:
• prevents coolant loss when the vehicle is in motion;
• prevents impurities from entering the system and
this minimizes corrosion;
• allows atmospheric pressure to eliminate the vac
uum that occurs in the system during cooldown;
• seals cooling system pressure up to 12 to 15 psi (82.7
to 103.4 kPa), which raises the coolant boiling point
approximately 2-l/2°F per psi (0.20°C per kPa) of
pressure.
RADIATOR
FILLER NECK
OVERFLOW
TUBE
VACUUM
VALVE
OPERATION
PRESSURE
VALVE
OPERATION
Fig. 1C-9 Radiator Cap Operation
Testing
41008
(1) Remove cap from radiator.
(2) Ensure seating surfaces are clean.
(3) Wet rubber gasket with water and install cap on
tester (fig. 1C-10)
(4) Operate tester pump and observe gauge pointer
at its highest point. Cap release pressure should be 12 to
15 psi (82.7 kPa to 103.4 kPa).
NOTE: Cap is satisfactory when constant pressure is
maintained or pressure is maintained within the 12 to 15
psi (82.7 to 1034 kPa) rangefor 30 seconds or more. If
gauge pointer drops quickly, replace cap.
TESTER
• jiHSlj 4283e!
Fig. 1C-10 Radiator Cap Pressure Test
FAN ASSEMBLY
Refer to the Cooling System Components chart for
specific applications.
There are several types of metal fans available for all
engines. Most engines with a standard cooling system
use a four-bladed rigid fan. Certain engines are fitted
with standard-equipment multi-bladed viscous drive
(Tempatrol) fans for noise reduction. All air-conditioned
vehicles have a viscous drive (Tempatrol) fan (fig. 1C-
11).
SILICONE
FLUID
CHAMBER
Fig. 1C-11 Tempatrol Fan—Typical
MOUNTING
FLANGE
42415
m
~
^
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