Coolant Reservoir-Removal And Installation; Water Pump-Check - Jeep cherokee 1989 Owner's Manual

Chapter 3 Cooling, heating and air conditioning systems
3-6
for the indicator system. Warning: If the vehicle is equipped with an
electric cooling fan, stay clear of the fan blades. The fan can come
on at any time.
2 If an overheating indication occurs, check the coolant level in the
system and then make sure the wiring between the light or gauge and
the sending unit is secure and all fuses are intact.
3 When the ignition switch is turned on and the starter motor is turn-
ing, the indicator light should be on (overheated engine indication).
4 If the light is not on, the bulb may be burned out, the ignition switch
may be faulty or the circuit may be open. Test the circuit by grounding
the wire to the sending unit while the ignition is on (engine not running
for safety). If the gauge deflects full scale or the light comes on, replace
the sending unit.
5 As soon as the engine starts, the light should go out and remain
out unless the engine overheats. Failure of the light to go out may be
due to a grounded wire between the light and the sending unit, a defec-
tive sending unit or a faulty ignition switch. Check the coolant t o make
sure it's the proper type. Plain water may have too low a boiling point
to activate the sending unit.
6 If the sending unit must be replaced, simply unscrew it from the
engine and install the replacement. Use sealant on the threads. Make
sure the engine is cool before removing the defective sending unit.
There will be some coolant loss as the unit is removed, so be prepared
to catch it. Check the level after the replacement has been installed.
On four-cylinder and V6 models, the coolant
reservoir is fastened by t w o screws (arrows)
8.4 The water pump weep hole (arrow) will drip coolant
when the seal on the pump shaft fails (pump removed
from engine for clarity)
The Motor Manual Guy
7 Coolant reservoir
Refer to illustrations 7.3a and 7.36
Warning: Wait until the engine is completely cool before beginning this
procedure.
1 Remove the reservoir filler cap and drain the cooling system (see
Chapter 1) until the coolant level is below the bottom of the reservoir.
2 Loosen the hose clamps and detach the hose(s) from the reservoir.
3
Remove the screws or retaining strap and lift the reservoir from
the vehicle (see illustrations).
4
Installation is the reverse of removal.
5 Refill the cooling system and check for leaks.
8
Water pump
Refer to illustrations 8.4 and 8.5
1 A failure in the water pump can cause serious engine damage due
to overheating.
2 There are three ways to check the operation of the water pump
while it's installed on the engine. If the pump is defective, it should
be replaced with a new or rebuilt unit.
On inline six-cylinder models, the coolant reservoir is
8.5 Grasp the water pump flange and try t o rock the
shaft back and forth t o check for play (fan and pulley
-
removal and installation
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check
fastened by a rubber retaining strap (arrow)
shown removed for clarity)