MARUTI SUZUKI Maruti 800 Service Manual page 60

DIAGNOSIS TEST TABLE
TESTING RESULTS
Pressure high
("A" area of high side
graph)
Pressure low
("B" area of high side
graph)
Pressure high
("A" area of low side
graph)
Pressure low
("B" area of low side
graph)
Outlet air temperature
at center duct is high
(Crossing point is in
area "A")
Outlet air temperature
at center duct is low
(Crossing point is in
area "B")
If ambient temperature is within 30 – 35 5C (86 – 95 5F), it is possible to do using next page table for detail diagnosis.
POSSIBLE CAUSE
Refrigerant overcharged
Expansion valve frozen or clogged
Clogged refrigerant passage of high side
Condenser fan malfunction
Dirty or bent condenser fins
Compressor malfunction (Insufficient oil etc.)
Engine overheat
Insufficient refrigerant (Insufficient charge or
leakage)
Expansion valve malfunction (valve opens too
wide)
Compressor malfunction (Insufficient
compression)
Expansion valve malfunction (valve opens too
wide)
Compressor malfunction (Insufficient
compression)
Insufficient refrigerant (Insufficient charge or
leakage)
Expansion valve malfunction (valve opens too
narrow)
Clogged refrigerant passage (crashed pipe)
Insufficient or excessive charge of refrigerant
Dirty or bent evaporator fins
Air leakage from cooling (heater) unit or air duct
Malfunctioning, switchover function of damper
in cooling (heater) unit
Compressor malfunction
Insufficient air volume from center duct (Heater
blower malfunction)
Compressor malfunction
AIR CONDITIONING (OPTIONAL) 1B-9
Recharge
Check expansion valve
Clean or replace
Insufficient Check condenser fan
cooling of
condenser Clean or repair
Check compressor
Check engine cooling
system
Check for leakage, repair if
necessary and recharge
Check expansion valve
Check compressor
Check expansion valve
Check compressor
Check for leakage, repair if
necessary and recharge
Check expansion valve
Repair or replace
Check refrigerant pressure
Clean or repair
Repair or replace
Repair or replace
Check compressor
Check blower motor and
fan
Check compressor
REMEDY