The A/C Condenser/Radiator Fans Do Not Run At High Speed, But Do Run At Low Speed (10-12 Models)

The A/C condenser/radiator fans do not run at high speed, but do run at low speed ('10-12 models)

Probable cause: Malfunction in the fan(s) high speed circuit(s)

Do the following troubleshooting as needed:

A/C condenser fan high speed circuit troubleshooting A/C Condenser Fan High Speed Circuit Troubleshooting

Radiator fan high speed circuit troubleshooting Radiator Fan High Speed Circuit Troubleshooting

Probable cause: A/C pressure sensor circuit malfunction

Do the A/C pressure sensor troubleshooting:

A/C pressure sensor circuit low voltage DTC Troubleshooting

A/C pressure sensor circuit high voltage DTC Troubleshooting

NOTE: The A/C pressure sensor can malfunction without setting a DTC

Also Check for

HVAC DTCs How To Troubleshoot The Heating And A/C Systems (Without Climate Control)

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Powertrain DTCs

Also Check for

Blown fuses No. 3-8 (30 A) and No. 3-6 (30 A) in the under-hood fuse/relay box

Also Check for

Poor ground at G301

Also Check for

Poor or loose connections at the terminals