XK-8 Convertible (X100) V8-4.0L (AJ26) (1997)
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Radiator Cooling Fan Motor: Description and Operation
Cooling Fans
The two radiator cooling fans, one high-speed and one low-speed, are mounted in a fan-cowl assembly within the cooling module.
The fans are controlled via the Engine Management System (EMS) dependent on the demand from the cooling system (temperature) or the air
conditioning system (pressure). This module acts as a combined cooling and refrigeration system.
In response to engine coolant temperature and climate control system demand, the ECM will energize the cooling fans.
Outputs from the ECM control two relays contained in the radiator fans module, to operate the fans in 'Off', 'Slow' and 'Fast' mode.
The fans operate in series (slow-mode) and parallel (fast-mode) under the control of the double-action radiator-mounted temperature switch as well as
being controlled by the vehicle's climate control/air-conditioning system. Hysteresis in the temperature and pressure switching values prevents
'hunting' between modes.
Under hot operating conditions, the fans may continue to operate for some time after the engine has been switched off.
The fans will stop automatically when the coolant temperature has been sufficiently reduced.
