RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 7 (2001)
Control Assembly: Testing and Inspection
Heater-A/C Control Test
Satisfactory heater and air conditioner performance depends upon proper operation and adjustment of all operating controls and refrigeration system
components. These inspections, tests, and adjustments should be used to locate the cause of a malfunction.
Operation must be tested as described in the following sequence:
1. Inspect and adjust the serpentine drive belt. Refer to Cooling for the procedures.
2. Start the engine and hold the idle speed at 1,300 rpm.
3. On vehicles with air conditioning, turn the temperature control knob to the extreme counterclockwise (Cool) position, and set the mode control
switch knob to the Bi-Level (A/C) position. The outside (recirculation) air door should be open to outside air. If not OK.
4. Open the vehicle windows. Test the blower motor operation in all speeds. If not OK.
5. On vehicles with air conditioning, the compressor should be running and the air conditioning system in operation unless the ambient air
temperature is below about -1 °C (30 °F). If not OK.
6. Check the mode control switch operation. The heater and air conditioner systems should respond as described in the owner's manual in the vehicle
glove box to each mode selected. Reduce the engine speed to normal idle. The vacuum will be high at low idle and the vacuum actuators should
respond quickly. If not OK.
7. If the vacuum tests, and the electrical component and circuit tests reveal no problems, disassemble the HVAC housing to inspect for mechanical
misalignment or binding of the mode doors.
