Diesel Data: Automotive Repair

Blower and Heater Controls and the A/C System Do Not Work (With Climate Control)




The blower and heater controls and the A/C system do not work

Probable cause: Climate control unit malfunction

Do the Climate Control Power and Ground Circuit Troubleshooting Climate Control Power And Ground Circuit Troubleshooting (With Climate Control)

Also check for

HVAC DTCs How To Troubleshoot The Climate Control System

Also check for

Blown fuse No. 30 (10 A) in the under-dash fuse/relay box

Also check for

Faulty blower motor relay

Also check for

Poor ground at G401

Also check for

Poor or loose connections at the terminals