Page 928 of 2490
combin
ed with the outlet duct and consequently, there is no separate housin
g assembly fitted above the water pump, as used
on the normally aspirated engine. The illustration shows the outlet duct viewed from the engine.
Thermostat Housing
The plastic housing for the thermostat is fitted between th e two cylinder banks immediately above the coolant pump.
Controlling the coolant flow through the radiator, the thermostat starts to open at 80 ° to 84 °C and is fully open at 96 °C.
A duct in the cylinder block connects the thermostat housing outlet to the coolant pump inlet. The joint between the
thermostat housing and the cylinder block is via an in-groove seal.
An air bleed outlet vents an y air in the system into the expansion reservoir, durin
g normal operation. A removable cap (usin g
a hex key) allows air to vent from the system when filling from empty.
On supercharged engines, the thermostat housin g is combined with the coolant outlet duct.
Radiator
Page 1246 of 2490
El
ectronic Engine Controls - En
gine Coolant Temperature (ECT)
Sensor4.0L NA V8 - AJ 27/3.2L NA V8 - AJ26
Remo
val and Installation
Remova
l
Installation
1. Op
en the engine compartment and fit paintwork protection
sheets.
2. Re
move the engine covers.
3. WA
RNING: ENSURE THAT THE ENGINE IS COLD BEFORE
COMMENCING WORK.
Slacken the coolant reservoir ca p to relieve coolant pressure
and re-tighten.
4. Remove t
he engine coolant temperature sensor.
1. Disconnect the harness plug from the sensor.
2. Remove the sensor and sealing washer.
1. Fitting is the reverse of the removal procedure, noting that a
new sealing washer should be us ed and tighten the sensor as
specified
Page 1248 of 2490
El
ectronic Engine Controls - En
gine Coolant Temperature (ECT)
Sensor4.0L SC V8 - AJ26
Re mo
val and Installation
Remova
l
Installation
1.
Op
en the engine compartment and fit paintwork protection
sheets.
2. WA
RNING: ENSURE THAT THE ENGINE IS COLD BEFORE
COMMENCING WORK.
Slacken the coolant reservoir ca p to relieve coolant pressure
and re-tighten.
3. Remove t
he engine coolant temperature sensor.
1. Disconnect the harness plug from the sensor.
2. Remove the sensor and sealing washer.
1. Fi
tting is the reverse of the removal procedure, noting that a
new sealing washer should be us ed and tighten the sensor as
specified
2. Check and adjust the cool ant level as required.
