*
Chapter 3 Cooling, heating and air conditioning systems 3-5
Replacement
Refer to illustration 5.6
5 Disconnect the negative battery cable. Remove the fan shroud
mounting screws and detach the shroud (see illustration 4.6).
6 Remove the bolts/nuts attaching the fan/clutch assembly to the water
pump hub (see illustration).
7 Lift the fan/clutch assembly (and shroud, if necessary) out of the en-
gine compartment.
8 Carefully inspect the fan blades for damage and defects. Replace it if
necessary.
9 At this point, the fan may be unbolted from the clutch, if necessary. if
the fan clutch is stored, position it with the radiator side facing down.
IO installation is the reverse of removal Be sure to tighten the fan and
clutch mounting nuts/bolts evenly and securely.
6 Coolant reservoir - removal
and
installation
1 The coolant reservoir is located on the right fendenveli. it should be
removed periodically and checked for cracks and other damage, and
flushed with clean water. Note:
On 1990andlatermodek thereservoiris
located on the left fenderwell.
2 To remove the reservoir, carefully pry off the cap with the hose at-
tached and lay the cap aside.
3 Pull out the reservoir and simultaneously pull up and slide the reser-
voir off its mount.
4 To install the reservoir, line it up with the mount and push down until it
is properly s’eated. Don’t forget to install the cap.
7 Wateppump -check
Refer to illustration 7.5
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.
3 With the engine running at normal operating temperature, squeeze
the upper radiator hose. if the water pump is working properly, a pressure
surge should be felt as the hose is released. Warning: Keep
yourhands
away from the fan blades!
5.6 Typical fan and clutch assembly
installation details
1 Upper fan shroud
2-5
Drivebelts
6 Fan and clutch assembly
7.5 Grasp the water pump flange and try to rock the shaft back
and forth to check for play (fan and pulley shown
removed for clarity)
4 Water pumps are equipped with weep or vent holes. If a failure occurs
in the pump seal, coolant will leak from the hole. in most cases you’ll need
aflashiighttofind$e holeon thewaterpumpfrom underneathtocheckfor
leaks.
5 if the water pump shaft bearings fail, there may be a howling sound at
the front of the engine while it’s running. Shaft wear can be felt if the water
pump pulley is rocked up and down (see illustration). Don’t mistake
drivebeltslippage,whichcausesasquealingsound,forwater bearingfail-
ure.
8 Water pump -replacement
26L engine
Removal
Refer to illustration 8.8
Warning:
Wait until the engine is completely cool tiefore beginning this
procedure.
1 Disconnect the negative battery cable from the battery.
2 Drain the cooling system (see Chapter 1). If the coolant is relatively
new or in good condition, save it and reuse it.
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