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05-20
COOLING SYSTEM - KV6 Engines
WARNING: Fans can start (or run on) for up to 4 minutes after the ignition is switched off.
Type Pressurised, spill return, thermostatically controlled water / anti-freeze
mixture
Cooling fans 2 x 11-blade variable speed electric cooling fans, ECM controlled
by PWM signal to electronic fan controllers
PWM duty cycle range 10 - 90%
Fans off PWM duty cycle = 10 - 49%
Cooling fans minimum speed 1300 rev/min @ 50% PWM duty cycle
Cooling fans maximum speed 3000 rev/min @ 90% PWM duty cycle
Cooling fan switching points - For A/C system:
⇒On When air conditioning is requested
⇒Fan minimum speed When A/C refrigerant pressure is less than 16000 kPa (16 bar,
232 lbf/in2)
⇒Fan maximum speed Refrigerant pressure at 27000 kPa (27 bar, 392 lbf/in2)
Cooling fan switching points (ECT sensor control) - for
engine cooling during normal running:
⇒Fan minimum speed switch on temperature 95°C
⇒Fan maximum speed temperature 114°C
⇒Fan switch off temperature 93.5°C
Cooling fan switching points - engine OFF soak Fans on for a maximum of 8 minutes
⇒On Coolant temperature exceeds 114°C
⇒Off Coolant temperature less than 112°C
Coolant pump Rotor type, mechanical, driven by camshaft timing belt
Coolant pump drive ratio 0.93:1
Coolant pump output @ 1000 rev/min. 0.5 litres / sec. (0.875 pts/sec)
Thermostat Wax element
Thermostat operating temperature:
⇒Initial opening 88°C ± 2°C
⇒Minimum opening - 9mm 96° C
Expansion tank pressure cap opens 1.4 bar
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