Vehicle: 2006 Dodge RAM 2500, 2WD, L6-5.9L DSL Turbo, VIN C, Automatic Transmission
Mileage: 168,009
Problem: The truck was brought to the shop because the A/C was blowing warm air. The customer said it was working fine the day before.
Case Details: The tech noted that the A/C compressor clutch was not engaging. The static A/C system pressures were within specifications, and he found no diagnostic trouble codes. At that point, he called ALLDATA Tech-Assist for some advice.
The Tech-Assist consultant recommended that the technician use a scan tool to monitor the data PIDs that could stop compressor operation, such as: engine coolant temperature, intake air temperature, A/C refrigerant pressure, ambient air temperature, and evaporator temperature.
The tech followed the consultant’s advice and found that the evaporator temperature sensor PID was reading only 1 degree Fahrenheit.
Next, he checked the evaporator temperature sensor electrical circuit. He found that pin 7 on Connector C1 at the control head was slightly pushed out.
Confirmed Repair:
Once he repaired and refitted the pin, the evaporator temperature sensor PID readings were back in the correct range. Normal compressor operation was restored, and A/C began cooling as designed. Fixed!
About the Author
Richard Diegle
Senior Automotive Editor for ALLDATA
Rich Diegle has been in the automotive industry since 1978. After graduating from a local community college, he began working at a Nissan dealership as a used car technician. Since then, he’s worked as a Nissan and ASE master automotive technician, shop owner, marketing copywriter, automotive editor, public relations manager, instructor, ALLDATA Tech-Assist team manager, and a senior automotive editor.