A/C Evaporator Service

The air conditioning evaporator should be checked annually for cleanliness. If the air conditioning system produces insufficient cooling, a possible cause is clogged evaporator fins. Fins will clog up from the side, opposite the blowers.

The evaporator is located inside the heating air conditioning unit under the cab.

To clean the evaporator, proceed as follows:

CAUTION: Stop the engine and remove key from ignition before leaving operator’s seat for any reason. A child or even a pet could engage an idling machine.

1. 
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   W110 Drain Hose Clamps

   
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   W150 Drain Hose Clamps

   A - Drain Hose Clamps

   Loosen the clamps (A) on the two drain hoses and pull the hoses off the air conditioning drain tubes.

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2. 
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   W110 Evaporator Cover

   
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   W150 Evaporator Cover

   B - Cover Screws

   C - Evaporator Cover

   Remove the ten screws (W110) or eight screws (W150) (B) that attach the cover (C).

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3. 
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   D - Blower Side Air

   Blow compressed air through the evaporator fins from the blower side first (D), as shown. Direct the air straight into the evaporator to prevent fin damage. A nozzle extension will make the procedure easier.

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4. Repeat this step from the side opposite the blowers.

5. If dirt is still present, soak the evaporator with water to loosen dirt and blow out with compressed air.

6. Reverse the procedure, after servicing the evaporator, to replace the cover and drain hoses.