Component Maintenance Manual
EFFECTIVITY: ALL
21-00-22
Page 4003
JULY 21, 2011
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 COIL AIR INLET AIR FILTER
: The air filter will, over time, become
clogged with dirt, dust and other foreign matter. It is essential that the air filter remain
clear for proper operation of the evaporator module assembly. Carefully remove air
filter from evaporator assembly and use a soft utility brush and/or vacuum to remove
any accumulated lint, dirt, dust and other foreign matter. If air filter shows signs of
deterioration, replace filter (refer to Disassembly, Section 5 and Assembly, Section 9).
6.3.1.3 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.
6.3.1.4 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.
6.3.1.5 EXPANSION VALVE
: The expansion valve should be free from dirt, dust and foreign
matter. Use a brush or rag to clean.
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