Mazda TTCC007700--1155--0011H Student Manual page 30

AIR CONDITIONING
03 - Conducting a Performance Check
Technician Name
CONDUCTING A PERFORMANCE CHECK
Purpose: In this activity, you will diagnose a vehicle's air conditioning system.
A performance check is the basis of air conditioning diagnosis. All diagnostic routines
should begin and end with this test to determine if the system is performing to
specifications. It is thorough and easy to perform.
What you will need to complete this activity:
Current model vehicle
Workshop Manual or Body Electrical Trouble Shooting Manual
Thermometer
R-134a Refrigerant Pressure Gauge Set (49 C061 0A0B Gas Charge Set)
Safety Glasses
Humidity and temperature have an effect on the outcome of this test.
Function Check
During the following tests, monitor instrument panel gauges and warning lights for
out of specification readings.
1. Set hand brake and place gear selector in Park (ATX) or Neutral (MTX).
2. Keep hood open throughout the test to maximize airflow through the radiator and
condenser.
3. With engine running, select all the blower fan speeds.
Does the fan speed change?
Are all speeds available?
(If no, repair according to workshop manual directions.)
4. Operate mode control to all positions and confirm that sufficient airflow is at each
position.
Does the airflow change according to the position of the mode control indication
on the dash?
(If no, repair according to workshop manual directions.)
NOTE
NOTE
Yes
Yes No
Yes No
No
TC070-15-01H
SG03-1