Diesel Data: Automotive Repair

HVAC Control Unit




Both fans do not run at low speed with the A/C on (but the A/C compressor runs with the A/C on)

Radiator and A/C condenser fan low speed circuit troubleshooting Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting

Also check for

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

Also check for

Blown fuse No. 7 (30 A) in the under-hood fuse/relay box, and No. 36 (10 A) in the under-dash fuse/relay box

Also check for

Poor ground at G202*1, G201*2

Also check for

Poor or loose connections at the terminals