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

Diagnostic Procedure:

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

2. Do the following troubleshooting as needed:

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

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

Also check for:

- Climate control DTCs Initial Inspection and Diagnostic Overview
- Powertrain DTCs Reading and Clearing Diagnostic Trouble Codes
- Blown fuse 3-6 (MAIN FAN MTR) (30 A) in the under-hood fuse/relay box
- Poor ground at G301
- Poor or loose connections at the terminals