651E Wheel Tractor-Scraper Heating and Air Conditioning Control Caterpillar


Heating and Air Conditioning Control
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1.1. Temperature Variable Control
2.1. Fan Speed Switch For The Heating and Air Conditioning System
3.1. Heating and Air Conditioning System Operation



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The heating controls and the air conditioning controls are located on the front dash to the right of the operator.

Temperature Variable Control




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Temperature Variable Control - Turn the knob anywhere between OFF position (left) and MAXIMUM position (right). This will control the amount of heating and the amount of cooling.

Fan Speed Switch For The Heating and Air Conditioning System




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The Fan Speed Switch for the Heating and for the Air Conditioning - The fan speed switch controls the three-speed blower fan motor.


Off (1) - Move the switch to this position in order to stop the blower fan.


Heater - Move the switch to the right in order to operate the heating system.


Low (2) - Move the switch to this symbol for the lowest fan speed.


Medium (3) - Move the switch to this symbol for a medium fan speed.


High (4) - Move the switch to this symbol for the highest fan speed.


Air Conditioner - Move the switch to the left in order to operate the air conditioning system.


High (5) - Move the switch to this symbol for the highest fan speed.


Medium (6) - Move the switch to this symbol for a medium fan speed.


Low (7) - Move the switch to this symbol for the lowest fan speed.

Heating and Air Conditioning System Operation

The heating and air conditioning system can perform four functions:


Heating - Turn the blower fan switch to LOW, MEDIUM or HIGH speed. Adjust the temperature variable control for the desired temperature.


Air Conditioning - Activate the air conditioning system. Turn the blower fan switch to LOW, MEDIUM or HIGH speed. Adjust the temperature variable control for the desired temperature.


Pressurizing - When heating or cooling is not desired, pressurize the cab in order to prevent dust from entering.

Turn the temperature variable controls to a comfortable stage. Turn the blower fan switch to LOW, MEDIUM, or HIGH speed. Use the fan speed that is needed to keep out the dust.


Defogging - Activate the air conditioning system. Turn the blower fan switch for the air conditioner to LOW, MEDIUM, or HIGH speed. Use the fan speed that is needed to remove moisture from the air in the cab. This prevents moisture from forming on the windshield and the windows. Adjust the temperature control until the moisture level is lowered. Adjust the temperature control until the temperature of the cab is comfortable.

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