12037 N Highway 99
Seminole, OK 74868
Phone (405) 382-0731
www.enviro-ok.com
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Copyright © 2020
Original Release
ATA 21‐00‐60
Page | 26
6.3. Evaporator Module Assembly Cleaning Procedures:
6.3.1. The following components of the Evaporator Module Assembly will require periodic
cleaning
(refer to the Inspection Schedule in section 7 for time intervals)
• Evaporator Coil Air Inlet
• Evaporator Housing Assembly
• Condensate Drain (part of Evaporator Housing Assembly)
• Expansion Valve
CAUTION
: USE EXTREME CARE TO PREVENT DAMAGE OR BENDING OF COIL FINS
6.3.1.1.
EVAPORATOR COIL AIR INLET: The coil fins will, over time, become clogged with
dirt, dust and other foreign matter. It is essential that the coil fins remain clear for proper
operation of the evaporator module assembly. Using a soft utility brush and/or vacuum,
remove any accumulated, lint, dirt, dust and other foreign matter. A small stiff brush such
as a tooth brush can be used to break loose any caked on dirt.
6.3.1.2.
EVAPORATOR HOUSING ASSEMBLY: The components that comprise the
evaporator housing assembly are the shroud and escutcheon. Over time, the shroud and
escutcheon may show signs of separating and this can cause the evaporator module
assembly to have less than optimal performance. If there are signs of separation between
the shroud and escutcheon, clean the separated areas carefully with isopropyl alcohol to
remove any dirt, dust, and other foreign matter, to include the old RTV sealant. Refer to
Repair (section 8) for resealing procedures.
6.3.1.3.
CONDENSATE DRAIN: The condensate drain can become clogged with dirt, dust
and foreign matter over time. It is essential that the drain remain free and clear of
foreign matter or performance will be less than optimal. Use a small brush or other
suitable cleaning tool to ensure that all foreign matter is removed from the drain.
6.3.1.4.
EXPANSION VALVE: The expansion valve should be free from dirt, dust and foreign
matter. Use a brush or rag to clean.
