A/C System Cooling Performance, Testing
Test Requirements
- Radiator and condenser clean (clean it necessary)
- Ribbed belt OK and correctly tensioned
- All air ducts, covers and seals OK and properly installed
- Air flow through dust and pollen filter not obstructed by dirt
- Air conditioner unit properly sealed (when fresh air blower is at maximum speed setting, no additional air is drawn in; air delivery is via vents only)
- Vehicle not standing in direct sunlight
- Engine at normal operating temperature
- All instrument panel vents open
- Engine running and A/C control head -E87- set as follows:
- AUTO mode
- Compressor switched on (LED in ECON button not lit up)
- Temperature selection LO (for both driver's side and passenger's side)
- Compressor activated (A/C clutch is switched on)
- Coolant fan -V7- running (at least 1st speed)
- Fresh air blower -V2- running at maximum speed
- Fresh air/recirculated air flap moved to "recirculated air" setting (within 1 minute of starting the engine)
- Air should come out of the instrument panel vents
- Both temperature flaps in "cooling" position
NOTE: If any of the above test requirements is not obtained refer to "On Board Diagnostic, Air Conditioning System/Check DTC Memory (Function 02) and perform output Diagnostic Test Mode refer to "On Board Diagnostic, Air Conditioning System/Output Diagnostic Test Mode (Function 03)".
Preparatory Steps
- Check DTC Memory and eliminate any malfunctions that may be displayed.
- Perform basic setting and check control module coding.
- Close hood and sunroof.
- Measure ambient temperature.
- Close doors and windows.
Testing
- Switch ignition on.
- Select AUTO mode on A/C control head -E87- and switch temperature setting to LO (both driver's side and passenger's side).
- Start engine.
The compressor will run.
- Press button for recirculated air.
The LED in the button will light up.
- Increase engine speed to 2000 RPM (timed period begins).
- Measure temperature of air delivered by instrument panel vents.
- Compare measured values with graph.
A - Temperature of air from center instrument panel vents
B - Measured ambient temperature
C - Permissible temperature range for air from vents
After 5 minutes (depending on ambient temperature) the temperature of air from the center instrument panel vents should settle to within tolerance range -C- on the graph.
NOTES:
- If the specified values are not obtained refer to "Compressor Was Switched Off During Cooling Performance Test" below.
- The temperature of the air from the vents can also be measured via the vent temperature sensors refer to "Read Measuring Value Block (Function 08)", display groups 007 and 008.
Identifying Malfunctions If Specified Values Are Not Obtained
Compressor Was Switched Off During Cooling Performance Test:
Compressor Was Switched Off During Cooling Performance Test - Continued:
