A/C - Conversion Information For Various Issues
SI B 64 03 09Heating and Air Conditioning
June 2009
Technical Service
SUBJECT
Heating and Air Conditioning Conversions Available in ISTA/P
MODEL
F01, F02 (7 Series)
SITUATION
One or more of the following situations may occur in regards to the heating and air conditioning system.
1. Unpleasant odor (musty smell) after starting the engine.
2. Actual temperature does not correspond to the set temperature.
3. The front footwell becomes too warm when the heater is in operation.
4. Unusual smell (ozone) in the vehicle.
5. Cooling temperature output and air flow are too low after the air conditioning system has been in operation for a period of time.
6. The rear automatic air conditioning system is reactivated after starting the vehicle, even though it was previously switched off.
7. The air conditioning system is always activated with the "AUTO" button.
8. After the vehicle is started, the front heater blower runs at high speed and generates too much noise.
CAUSE
1. Moisture deposits on the evaporator create a damp environment which can cause an odor.
2. Temperature perception is different for each customer.
3. The specified temperature target value does not correspond to the customer's perception of the temperature.
4. The O3 generator (ozone generator) has been activated.
5. The heating and air conditioning system evaporator has iced up.
6. Normal switching pattern of the rear automatic air conditioning system.
7. As a result of the system design, the air conditioning system is also switched on when the "AUTO" button is pressed.
8. As a result of system design, the speed of the blower is raised if the blower of the rear air conditioning system has been previously set manually.
PROCEDURE
The following modifications to the heating and air conditioning system can be performed using ISTA/P, by selecting "Vehicle" and then "Conversions", and selecting the desired function to change.
Refer to CenterNet > Aftersales Portal > Service > Workshop Technology > Vehicle programming for information about ISTA/P.
1. "Conversion. Odor start locking"
Note:
When this conversion is activated, the blower air from the air conditioning system is blown out via the evaporator drains for approximately 3 seconds each time the vehicle is started. This also means that no air emerges from the ventilation grilles for 3 seconds when the vehicle is started.
2. "Conversion, temperature target value correction, x degrees"
Note:
This conversion can be used to correct the temperature target value setting accordingly.
3. "Conversion, lowering temperature level of footwell"
Note:
Not available until ISTA/P 2.34.0 or later.
4. "Conversion, deactivate disinfection of air conditioning"
Note:
An O3 generator has been fitted to automatically clean the evaporator of the air conditioning system. This cleaning can only be performed if the ignition has been switched off and the vehicle has been locked from the outside. As a result of this modification, the O3 generator is deactivated.
5. "Conversion, activate raising evaporator minimum temperature"
6. "Conversion, activate OFF memory beyond after-run"
Note:
The "rear automatic air conditioning system ON" status is stored for 15 minutes after the ignition has been turned "OFF". This modification can be used to leave the "ON" status of the rear automatic air conditioning system permanently switched off.
7. "Conversion, air conditioner not on with AUTO operation"
Note:
This modification removes the connection between the air conditioning system and the "AUTO" button.
8. "Conversion, activate reset of rear automatic climate control on vehicle start"
Note:
When this modification is applied, the rear control panel is set to "Automatic" and the target temperature is set to a target value of 72 degrees F (22 C).
WARRANTY INFORMATION
Information only
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