Introduction:
The initial vehicle inspection is not a checklist. Systems with a fixed orifice valve and cycle switch (CCOT) are controlled mainly by pressure measurement. This means that pressure type tests like cycle tests are well suited to diagnosing system faults. Systems like TXV which are controlled by measuring temperature are well suited to all gauge and temperature tests.
Simple inspection routine
CHECK CONDENSER FINS FOR BLOCKAGE OR DAMAGE
Note – be careful not to damage the fins.
CHECK THE POLLEN FILTER FOR SERVICE CONDITION
MAKE SURE THAT DRIVE BELT IS INSTALLED CORRECTLY
CHECK DRIVE BELT TENSION
CHECK CONDENSER FAN FREELY ROTATES
Note – after installing the drive belt, check that it fits properly in the ribbed grooves.
CHECK ENGINE COOLANT LEVEL
START ENGINE AND TURN ON A/C SWITCH
CHECK MAGNETIC CLUTCH OPERATION
CHECK THAT IDLE INCREASES
CHECK THAT CONDENSER FAN MOTOR CUTS IN
CHECK THAT THE HEATING PIPES LEADING TO THE HEAT EXCHANGER ARE HOT
CHECK THE PERFORMANCE OF THE A/C CONTROLS
The initial vehicle inspection should direct the technician to one of the following:
1. A performance diagnostic test on the A/C operation:
2. A/C electrical tests:
Information from the customer on the symptoms, vehicle history and conditions upon which the fault occurs will allow the technician to be selective. The technician should first try to gather as much information as possible and assess if the symptom is normal behaviour (water dripping from underneath the vehicle) or not. The technician should then assess if the environment in which the fault occurs can be replicated.