Diagnostic Chart

System Pressure OK (High and Low Side)
| |
Yes No
| |
A/C System Cooling Performance OK? Troubleshooting System
| |
Yes No
| |
-Check switching pressures Was the Compressor
for A/C refrigerant low pressure Switched off during
switch -F73- and replace if A/C Cooling Perf. test?
necessary. | |
-Check Switching Pressures Yes No
for A/C refrigerant high | |
pressure switch -F118- and -Read Measuring -Check coupling
replace if necessary. Value Block; between
repair or evaporator and
eliminate heater box.
malfunction