Air Conditioner Solution or Fix by Symptoms

Vehicles Engine Bay

Learn how to troubleshoot your car air conditioning system based on current conditions and know possible solutions to fix the problem by following the procedures below.

A/C  SYMPTOMS CHART
High-pressureLow-pressureClutch cycle times: cycleClutch cycle times: on-timeClutch cycle times: off-timeFault cause/action
too hightoo highA/C compressor running constantlyA/C compressor running constantlyA/C compressor running constantlyAir conditioning condenser contaminated
too highnormal to too highA/C compressor running constantlyA/C compressor running constantlyA/C compressor running constantlyEngine overheated
normal to too highnormalA/C compressor running constantlyA/C compressor running constantlyA/C compressor running constantlyAir or contaminants in the circuit. Too much refrigerant in the system
normaltoo highA/C compressor running constantlyA/C compressor running constantlyA/C compressor running constantlyFixed orifice tube. O-rings damaged or leaking
normalnormaltoo slowtoo long or constantlynormal or not at allContaminants in the circuit or too much refrigerant oil
normaltoo lowtoo slowtoo longtoo longA/C low pressure switch faulty
normal to too lowtoo highA/C compressor running constantlyA/C compressor running constantlyA/C compressor running constantlyA/C compressor faulty
normal to too lownormal to too highA/C compressor running constantlyA/C compressor running constantlyA/C compressor running constantlyLow-pressure line blocked
normal to too lownormaltoo fasttoo shortnormalEvaporator blocked
normal to too lownormaltoo fasttoo shortnormal to too longAir-conditioning condenser, fixed orifice tube or high-pressure line blocked
normal to too lownormaltoo fasttoo shorttoo shortNot enough refrigerant in the system
normal to too lownormaltoo fasttoo shorttoo longEvaporator input line blocked
normal to too lowtoo lowA/C compressor running constantlyA/C compressor running constantlyA/C compressor running constantlyLow-pressure line
irregular operation or inoperativeirregular operation or inoperativeirregular operation or inoperativeA/C low-pressure switch contacts are dirty or permanently open. The connector of the A/C low-pressure switch or of the A/C compressor clutch is dirty or damaged.
R-134a TEMPERATURE PRESSURE CHART
Ambient Temperature Low-Pressure Gauge High-Pressure Gauge
65°F (18°C) 25-35 psi/ 172.241 kPa 135.155 psi/931-1069 kPa
70°F (21°C) 35-40 psi / 241-276 kPa 145-160 psi/1000-1103 kPa
75°F (24°C) 35-45 psi/241-310 kPa 150-170 psi /1034-1172 kPa
80°F (27 C) 40-50 psi/276-345 kPa 175-210 psi / 1207-1448 kPa
85°F (29°C) 45-55 psi/310-379 kPa 225-250 psi/1551-1724 kPa
90°F (32°C) 45-55 psi/310-379 kPa 250-270 psi / 1724-1862 kPa
95°F (35°C) 50-55 psi/345-379 kPa 275-300 psi / 1896-2068 kPa
100 F(38.C) 50-55 psi/ 345-379 kPa 315-325 psi/ 2172-2241 kPa
105°F (41°C) 50-55 psi/345-379 kPa 330-335 psi / 2275-2310 kPa
110°F(43°) 50-55 psi/345-379 kPa 340-345 psi/2344-2379 kPa
R-134a TEMPERATURE PRESSURE CHARTAmbient TemperatureLow-Pressure GaugeHigh-Pressure Gauge65°F (18°C)25-35 psi/ 172.241 kPa135.155 psi/931-1069 kPa70°F (21°C)35-40 psi / 241-276 kPa145-160 psi/1000-1103 kPa75°F (24°C)35-45 psi/241-310 kPa150-170 psi /1034-1172 kPa80°F (27 C)40-50 psi/276-345 kPa175-210 psi / 1207-1448 kPa85°F (29°C)45-55 psi/310-379 kPa225-250 psi/1551-1724 kPa90°F (32°C)45-55 psi/310-379 kPa250-270 psi / 1724-1862 kPa95°F (35°C)50-55 psi/345-379 kPa275-300 psi / 1896-2068 kPa100 F(38.C)50-55 psi/ 345-379 kPa315-325 psi/ 2172-2241 kPa105°F (41°C)50-55 psi/345-379 kPa330-335 psi / 2275-2310 kPa110°F(43°)50-55 psi/345-379 kPa340-345 psi/2344-2379 kPa
R-134a TEMPERATURE PRESSURE CHART
Ambient TemperatureLow-Pressure GaugeHigh-Pressure Gauge
65°F (18°C)25-35 psi/ 172.241 kPa135.155 psi/931-1069 kPa
70°F (21°C)35-40 psi / 241-276 kPa145-160 psi/1000-1103 kPa
75°F (24°C)35-45 psi/241-310 kPa150-170 psi /1034-1172 kPa
80°F (27 C)40-50 psi/276-345 kPa175-210 psi / 1207-1448 kPa
85°F (29°C)45-55 psi/310-379 kPa225-250 psi/1551-1724 kPa
90°F (32°C)45-55 psi/310-379 kPa250-270 psi / 1724-1862 kPa
95°F (35°C)50-55 psi/345-379 kPa275-300 psi / 1896-2068 kPa
100 F(38.C)50-55 psi/ 345-379 kPa315-325 psi/ 2172-2241 kPa
105°F (41°C)50-55 psi/345-379 kPa330-335 psi / 2275-2310 kPa
110°F(43°)50-55 psi/345-379 kPa340-345 psi/2344-2379 kPa

We hope you find the Air Conditioner Solution or Fix by Symptoms guide helpful. Check these troubleshooting and repair guides for more help on your vehicle.

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