412-00-36 Climate Control System — General Information 412-00-36
DIAGNOSIS AND TESTING (CONTINUED)
Item
Description
1 Low-pressure (bar)
2 Outside temperature (°C)
Required values: switching cycles
The following three diagrams show the required
values for the compressor switching cycles.
Measure the cycles using a stopwatch and make
a note of the result.
If the measured value lies outside the tolerance
range then there is an error in the system.
Refer to the Symptom Chart in this section.
NOTE: The total cycle time is obtained by adding
the on time to the off time.
Specified values for on time
Item
Description
1 On-time (s)
2 Outside temperature (°C)
Specified values for off time
Item
Description
1 Off-time (s)
Item
Description
2 Outside temperature (°C)
Specified values for total cycle time
Item
Description
1 Total cycle time (s)
2 Outside temperature (°C)
Check the on/off-cycles
The following conditions must be met before
checking the switching cycle:
1. Connect the pressure gauges to the high and
low-pressure side of the air conditioning
system.
2. Start the engine and allow it to run for
approx. 10 min at 1500 rev/min.
3. Set the air conditioning to maximum cooling
and air re-circulation.
4. Set the blower to maximum power.
5. Adjust the interior temperature to approx. 22
°C.
6. Measure the switching cycles using a
stopwatch and make a note of the results.
7. Read off the pressure from the pressure
gauges, make a note of the values and
compare them with the required values in the
diagrams.
As an example, after comparison with the
diagrams the following five faults could be
present. Next compare these statements with
those in the Symptom Chart on the next page
and read off the cause of the fault.
Example:
• High-pressure - too low
• Low-pressure - normal
• Switching cycles per minute - too many
E9425 EN 07/2001 2002 Bantam
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