PISTON 2N9021 - Caterpillar

inspection is needed to ensure that the holes for the condensate drainage are not plugged with debris. Regular inspection is also needed to ensure that adequate flow is seen from the case. When the air conditioning system is in operation, there should be evidence of condensate that is exiting the machine from the drain lines.
Check the drain lines for pinch points.
If the lines are plugged with dirt and debris, flush the lines with water.To make sure that the drainage system is working, open the HVAC case and inspect the interior sloped floor or the drain pan.
Ensure that no large debris is clogging the drain.
If any large debris is observed, the HVAC case should be cleaned to prevent any future buildup from clogging the path of drainage.
Once the area for drainage has been cleaned, reassemble the HVAC case to make sure that the system works. Run the system and check the drain lines for condensate flow.