Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1989 engine cooling system
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ENGINE COOLING SYSTEM
1988 Toyota Celica
1987-88 TOYOTA
Engine Cooling Systems
Celica
DESCRIPTION
The basic liquid cooling system consists of a radiator,
water pump, thermostat, cooling fan, pressure cap, heater (if
equipped), and various connecting hoses and cooling passages in the
block and cylinder head. In addition, many cars use a fan clutch
(incorporating a thermostatic control) or flexible fan blade. These
reduce noise and power requirements at higher engine speeds.
Some models may use a thermostatic vacuum switch to advance
ignition timing in the event of overheating. Most models use a
coolant recovery system to prevent loss of anti-freeze.
MAINTENANCE
DRAINING
Remove radiator cap and open heater control valve to maximum
heat position. Open drain cocks or remove plugs in bottom of radiator
and in engine block. In-line engines usually have one plug or cock,
while "V" type engines will have two, one in each bank of cylinders.
CLEANING
A good cleaning compound removes most rust and scale. Follow
manufacturer's instructions in the use of cleaner. If considerable
rust and scale has to be removed, flushing should be used. Clean
radiator air passages by blowing with compressed air from back to
front of radiator.
FLUSHING
CAUTION: Some manufacturers use an aluminum and plastic radiator on
some models (identified by a note below the filler neck).
Material used for cleaning and flushing must be compatible
with aluminum, according to manufacturer's recommendations.
1) Back flushing is a very effective means of removing rust
and scale from a cooling system. For best results, the radiator,
engine and heater core should be flushed separately.
2) To flush radiator, connect flushing gun to water outlet
of radiator and disconnect water inlet hose. Use a leadaway hose,
connected to radiator inlet, to prevent flooding engine. Use air in
short bursts only, as this will prevent damage to radiator. Continue
flushing until water runs clear.
3) To flush engine, first remove thermostat and replace
housing. Connect flushing gun to water outlet of engine. Disconnect
heater hoses from engine. Flush using short air bursts until water
runs clean. Flush heater core as described for radiator. Make sure
heater valve is set to maximum heat position before flushing heater.
REFILLING
Engine should be running while refilling cooling system to
prevent air from being trapped in the engine block. After system is
full, continue running engine until thermostat is open, then recheck
fill level. Do not overfill system.
THERMOSTAT
1) Visually inspect thermostat for corrosion and proper
sealing of valve and seat. If satisfactory, suspend thermostat and a
thermometer in a container with a 50/50 mixture of anti-freeze and
water. See Fig. 1.
2) Do not allow either thermostat or thermometer to touch
bottom of container, as this concentration of heat could cause an
incorrect reading. Heat water until thermostat just begins to open.
Fig. 1: Testing Thermostat in Anti-Freeze/Water Solution
Support thermometer so it does not touch bottom of container.
3) Read temperature on thermometer. This is the initial
opening temperature and should be within specifications. Continue
heating water until thermostat is fully open and note temperature.
This is the fully opened temperature. If either reading is outside of
specifications, replace thermostat, as it is not adjustable.
NOTE: General Motors Imports recommends hanging thermostat in 33%
glycol solution at 25 F (4 C) above temperature stamped on
thermostat. Valve should open. Remove thermostat from
solution
and place in similar solution at 10 F (-12 C) below stamped
temperature. Valve should close.
PRESSURE TESTING
A pressure testing tool is used to test both radiator cap
and complete cooling system. Test as follows, following tool
manufacturer's instructions.
Radiator Cap
Visually inspect radiator cap, then dip cap in water and
connect to tester. Pump tester to bring pressure to upper limit of
cap specifications. If cap fails to hold pressure within
specifications, replace cap.
Fig. 2: Testing Radiator Pressure Cap
Wet cap gasket before testing.
Cooling System
1) With engine off, wipe radiator filler neck seat clean.
Fill radiator to correct level. Attach tester to radiator and pump
until pressure is at upper limit of radiator rating.
2) If pressure drops, inspect for external leaks. If no
leaks are apparent, detach tester and run engine until normal
operating temperature is obtained. Reattach tester and observe. If
pressure builds up immediately, a possible leak exists from a faulty
head gasket or crack in head or block.
CAUTION: Pressure may build up quickly. Release any excess pressure
or cooling system damage may result.
3) If there is no immediate pressure build up, pump tester
to within system pressure range (on radiator cap). Vibration of gauge
pointer indicates compression or combustion leak into cooling system.
Isolate leak by shorting each spark plug wire to cylinder block.
Gauge pointer should stop or decrease vibration when leaking cylinder
is shorted.
CAUTION: Do not disconnect spark plug wires while engine is
operating, or operate engine with spark plug shorted for
more than 1 minute, as catalytic converter may be damaged.
4) Remove engine and transmission (automatic only) oil
dipsticks and check if water drops appear in oil. If so, a serious
internal leak is indicated. If all checks are negative and system
holds pressure for 2 minutes, there are no serious leaks in system.
Fig. 3: Pressure Testing Cooling System
Pump up to specified pressure.
ANTI-FREEZE CONCENTRATION
NOTE: On models using aluminum engines or cooling system
components, refer to Owners Manual for anti-freeze
requirements and recommendations. Aluminum components
require a different formulation of anti-freeze to prevent
corrosion.
On all cooling systems, test anti-freeze concentration using
anti-freeze tester. Tester should have a temperature-compensating
feature, as failing to take temperature into consideration could
cause an error as large as 30 F (16 C). Follow tester manufacturer's
instructions for correct use of tester.
COOLANT RECOVERY SYSTEMS
DESCRIPTION
A coolant recovery system differs from other cooling systems
in that an overflow bottle is connected to the radiator overflow
hose. Overflow bottle is transparent or translucent to permit
checking of coolant level without removing radiator cap. No
adjustment or test is required except keeping vent hole or hose clean
and checking pressure relief of radiator cap.
OPERATION
As coolant temperature rises and pressure in system exceeds
pressure relief valve of radiator cap, excess coolant flows into
overflow bottle. As engine cools and coolant contracts, vacuum is
formed in the system. Vacuum draws coolant, stored in overflow
bottle, back into radiator. In a properly maintained cooling system,
the only coolant losses will be through evaporation.
Overflow bottle captures and releases coolant according to
temperature. See Fig. 4.
Fig. 4: Typical Coolant Recover System
THERMOSTATICALLY CONTROLLED ELECTRIC FANS
DESCRIPTION
Electrically-driven fans are actuated by thermal relay
switches. Thermal switches turn fan motor on when necessary and shut
fan motor off when not needed. Air conditioned vehicles are equipped
with over-ride switches. These switches turn fan motor on whenever
air conditioning system is operating. When system is turned off, fan
motor control is returned to thermal relay.
Fig. 5: Typical Thermostatically Controlled Electric Fan
VARIABLE SPEED COOLING FANS - FLEX-BLADE FANS
DESCRIPTION
This unit is a flexible blade assembly designed to flex
blades as engine RPM increases. As RPM increases, blade pitch
decreases, thereby saving power and decreasing noise level. Keep fan
belt adjusted to proper tension as necessary.
Fig. 6: Flex Blade Fan Assembly
VARIABLE SPEED COOLING FANS FAN CLUTCH WITH THERMOSTATIC
CONTROL
DESCRIPTION
Most air conditioned models use a thermostatically
controlled fluid fan and torque control clutch. Thermal control drive
is a silicone-filled coupling connecting fan to a fan pulley, and is
operated by a control valve. Control valve is operated by a
temperature sensitive bi-metallic coil or strip and controls flow of
silicone through the clutch.
During periods of operation when radiator discharge air
temperature is low, fan clutch speeds are slowed, decreasing load on
fan belt. High radiator discharge air temperature causes bi-metallic
coil or strip to allow a greater flow of silicone to enter clutch.
This increases drag between driven member and driving member
resulting in a higher fan speed and increased cooling.
Fig. 7: Thermostatically Controlled Fan Assembly
Shown with stamped face and bi-metallic coil spring.
COOLING FAN QUICK TEST
1) Ensure engine is cold. Turn ignition to "ON" position. Fan
should not run. If so, check cooling fan relay, radiator fan switch
and wiring.
2) With ignition on, unplug radiator fan switch. Fan motor
should operate. If not, check cooling fan relay, fan motor, engine
main relay, fuse, and wiring. Connect radiator fan switch.
COMPONENT TESTING
Cooling Fan Relay
Cooling fan relays are located in engine compartment relay
and fuse box. See Fig. 8 as guide to test relay.
Fig. 8: Testing Cooling Fan Relay
Courtesy of Toyota Motor Sales, U.S.A., Inc.
Engine Main Relay
Engine main relay supplies power to cooling fan relay. Relay
is located in engine compartment relay and fuse box. Use illustration
as guide to test relay. See Fig. 9
Fig. 9: Testing Engine Main Relay
Courtesy of Toyota Motor Sales, U.S.A., Inc.
Fan Motor
Unplug fan motor connector. Connect battery and ammeter to
fan motor. Fan should operate smoothly and amperage draw should be
within range. See FAN MOTOR AMPERAGE DRAW SPECIFICATIONS table.
FAN MOTOR AMPERAGE DRAW SPECIFICATIONS TABLE
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