13
2001 model year changes
E39 IHKR
The 525i/it will be fitted with IHKR as standard
equipment. IHKA will be available as an option
on those vehicles by ordering the Convenience
package: SA 466.
IHKR is a semi-automatically regulated heating
and air-conditioning system. The components
are similar to the IHKR system used in the X5
3.0i.
The E39 IHKR is a single zone system that regulates the temperature of the cabin based
on the occupants desired temperature, selected by a temperature setting dial. Blower con-
trol, air distribution settings and stratification flap are manual.
System Components
The E39 IHKR consists of the following components:
IHKR control unit with operating controls
IHKR integrated heater and air conditioning case
1 Heater core temperature sensor
Evaporator temperature sensor
Interior temperature sensor (located in drivers footwell)
Double cage blower motor and final stage
1 Water valve (duty cycle controlled)
Auxiliary water pump
1 Fresh air/re-circ stepper motor
Auxiliary fan (DME controlled)
Refrigerant Pressure Sensor
Left and right fresh air micro-filters
