Diesel Data: Automotive Repair

The Condenser/Radiator Fans Do Not Run At High Speed, But Do Run At Low Speed




The condenser/radiator fans do not run at high speed, but do run at low speed

Probable cause: Malfunction in the fan 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

Also check for

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

Also check for

Powertrain DTCs

Also check for

Blown fuse No. 6 (20A), No. 15 (7.5A) and No. 7 (20A) in the under-hood fuse/relay box

Also check for

Poor ground at G302

Also check for

Poor or loose connections at the terminals