307D, 311D, 312D, 313D, 315D, 318D, 319D, 320D, 323D, 324D, 325D, 326D, 328D, 329D, 330D, 336D, 340D, 345D, 349D, 374D, 390D and M325D Excavators Air Conditioning and Heating Control Panel (Air Conditioner and Heater) Caterpillar


Control Panel (Air Conditioner and Heater)
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1.1. Functionality of the Switches
2.1. English Versus Metric Toggle
3.1. Display of Codes During Operation


Illustration 1g01441758
Control Panel Type 1


Illustration 2g03342251
Control Panel Type 2
(1) Air outlet select switch
(2) Temperature switch
(3) Fan switch
(4) Air inlet select switch
(5) On/Off switch
(6) Automatic control switch
(7) Display
(8) Compressor switch
(9) Defrost mode

The climate control panel is located under the right window inside the cab:

Functionality of the Switches



Illustration 3g01122088
(A) Vent for upper body
(B) Floor vent
(C) Defroster vent
(D) Defroster Vent
(E) Vent for upper body
(F) Control panel

Redirect the louvers for air outlets (A), (C), (D), and (E) by hand to the desired direction. The louvers for air outlet (B) cannot be redirected.

Air Outlet Select Switch (1) - This switch selects the position of each air outlet. Each switch controls a different air outlet.

Upper Body - Selecting this switch will open air outlet (A) and air outlet (D).

Upper Body and Floor - Selecting this switch will open air outlet (A), air outlet (B), and air outlet (D).

Floor - Selecting this switch will open air outlet (B).

Floor and Defroster - Selecting this switch will open air outlet (B) and air outlets (C) and (D).

Temperature Switch (2) - These switches control the temperature of the air that is coming from the air outlets to achieve the preset temperature. This preset temperature appears on display (7). If the heating and air conditioning system is in the automatic mode, pushing these switches changes the preset temperature.

Increase - Push this switch to increase the temperature of the air that is coming out of the air outlets or push this switch to increase the preset temperature.

Decrease - Push this switch to decrease the temperature of the air that is coming out of the air outlets or push this switch to decrease the preset temperature.

Fan Switch (3) - The fan switch directly controls the fan speed. If the climate control system is operating in the automatic mode, pushing this switch overrides the automatically selected fan speed.

Increase - Push this switch to increase the fan speed.

Decrease - Push this switch to decrease the fan speed.

Air Inlet Select Switch (4) - This switch selects the position of the air inlet.

Recirculate - When this position is selected, the air inlet is closed. The air will recirculate inside the cab.

Fresh Air - When this position is selected, the air inlet is open. Fresh air will circulate into the cab.

Main Power ON/OFF Switch (5) - Push the ON/OFF switch to power on the system. Push the switch again to power off the system.

Automatic Control Switch (6) - To enter the full "AUT" mode for automatic climate control, push this switch. However, if you push the switch again, you cannot turn off the air conditioning. When the system is in full "AUT" mode, you can manually change specific functions by pushing another switch. If you manually change a specific function, "AUT" does not appear in the display, but the unchanged functions will remain in "AUT" mode. Even on a day that is sunny, a climate control system with only a heater can cool the cab in full "AUT" mode if the ambient temperature is no more than 20 °C (68 °F).

The climate control unit provides excellent operator comfort in the full "AUT" setting. Press the "AUT" switch for full "AUT" mode. Push temperature switch (2) to set the desired temperature. The temperature is only shown in metric values. All other functions of climate control will be handled automatically.

If the climate control system is in the full "AUT" setting at engine start-up and the temperature inside the cab is too warm or too cool, the damper for fresh air ventilation may automatically close for a few minutes. This damper closing will help to bring the air temperature to the preset temperature more quickly.

Compressor Switch (8) - Push the switch to turn on the compressor or push the switch to turn off the compressor. In humid conditions, the compressor may be used to remove moisture from the air in the cab. In cool weather, operate the compressor weekly to prevent leakage of the refrigerant gas. This operation will also help to maintain the compressor in optimum working order.

Defrost (9) - Depressing this switch will defog the windows. The air will also be dehumidified while the compressor is running. This selection directs air flow out of air outlet (C) and air outlet (D).

Consult with your AVSpare dealer for periodic maintenance of the heating and air conditioning system.

English Versus Metric Toggle

To convert the temperature reading from Degrees Celsius to Degrees Fahrenheit, depress both keys of the temperature switch at the same time for 5 seconds when the ON/OFF switch is in the ON position. The same action is used for converting the temperature reading from Degrees Fahrenheit to Degrees Celsius.

Display of Codes During Operation



Illustration 4g01441757

The display (7) shows codes when system components are operating abnormally.

When a failure occurs, display (7) shows the letter "E" in the last position. For example, if an error occurs and the system is set at 20°C (68°F), display (7) will show "20. E (68. E)". Refer to Testing and Adjusting, "Troubleshooting Faults With Service Codes" for more information on a particular fault.

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