The A/C Condenser/Radiator Fans Do Not Run At High Speed, But Do Run At Low Speed (With A/C)

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

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

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, R18A1 engine Radiator Fan High Speed Circuit Troubleshooting, K20Z3 engine Radiator Fan High Speed Circuit Troubleshooting

Also check for

HVAC DTCs How To Troubleshoot The Heating And A/C Systems

Also check for

Powertrain DTCs; R18A1 engine Initial Inspection and Diagnostic Overview, K20Z3 engine Initial Inspection and Diagnostic Overview

Also check for

Poor ground at G301; R18A1 engine, K20Z3 engine

Also check for

Poor or loose connections at the terminals