TX / TXH / TXB 180S - 400L (Rev. 4/23/07)TX / TXH / TXB 180S - 400L (Rev. 4/23/07)
20A-220A-2
FILTERFILTER
COVERCOVER
FASTENERSFASTENERS
Illustration 20A-1. Illustration 20A-1. Air Conditioner Air Conditioner / Heater / Heater UnitUnit
Heater Shut-off Heater Shut-off VValvealve(Illustration 20A-1)(Illustration 20A-1).. TheThe
heater shut-off valve controls the circulation ofheater shut-off valve controls the circulation of
heated coolant through the air conditioning / heat-heated coolant through the air conditioning / heat-
er unit. er unit. AdditionallyAdditionally, there are t, there are two shut-off wo shut-off valves,valves,
located on the engine, that control the circulationlocated on the engine, that control the circulation
of heated coolant through the heating / defrostingof heated coolant through the heating / defrosting
circuit. circuit. All three shut-ofAll three shut-off valves must f valves must be fully openbe fully open
for maximum for maximum heating. heating. If any of If any of the shut-off the shut-off valvesvalves
are closed, there will be no circulation of heatedare closed, there will be no circulation of heated
coolant through the heating system.coolant through the heating system.
Refrigerant Hoses.Refrigerant Hoses. Periodically Periodically check check the hosesthe hoses
and fittings and fittings for chafing for chafing or cracking. or cracking. Replace asReplace as
conditions require.conditions require.
Cleaning and / or Changing The Air Condition-Cleaning and / or Changing The Air Condition-
er / Heater Unit Filterser / Heater Unit Filters (Illustration 20A-1)(Illustration 20A-1).. The The
air conditioner filters should be cleaned everyair conditioner filters should be cleaned every
3 months 3 months or as conditions or as conditions warrant. warrant. The filtersThe filters
must be replaced yearly or as conditions warrant.must be replaced yearly or as conditions warrant.
If filters are not cleaned regularly, they mayIf filters are not cleaned regularly, they may
become partially clogged with lint, dirt, grease orbecome partially clogged with lint, dirt, grease or
other debris. other debris. The filters The filters should be cshould be cleaned orleaned or
changed as changed as conditions warrant. conditions warrant. Perform the Perform the fol-fol-
lowing procedures to remove filters for cleaning orlowing procedures to remove filters for cleaning or
replacement:replacement:
1.1. RemovRemove file filter ter covercovers frs from tom the aihe air conr conditionditioner /er /
heater unit’s housing by removing fasteners.heater unit’s housing by removing fasteners.
2.2. RemovRemove fie filters lters from from filtefilter covr covers aers and cnd clean lean withwith
low pressure airlow pressure air. . Replace old filters Replace old filters with newwith new
filters if filters are damaged.filters if filters are damaged.
3.3. InstaInstall the fll the filterilters in ts in the filhe filter coter covers vers and and secsecureure
filter covers to air conditioner / heater unit withfilter covers to air conditioner / heater unit with
fasteners.fasteners.
Inspection.Inspection. In the In the event of event of a cooling a cooling problem,problem,
perform the following inspection procedures.perform the following inspection procedures.
Death or serious injury couldDeath or serious injury could
result from result from a runaway truck. a runaway truck. Park the truck Park the truck onon
a hard, level surface, apply the parking brakea hard, level surface, apply the parking brake
and block the wheels in both directions toand block the wheels in both directions to
prevent movement of the truck.prevent movement of the truck.
Rotating fan and belts canRotating fan and belts can
cause severe injury. cause severe injury. Stay clear Stay clear of fan of fan andand
belts when engine is running.belts when engine is running.
1.1. CheCheck thck the come comprepressossor drivr drive belt te belt tensension anion andd
pulley alignment. pulley alignment. TTension on the drive ension on the drive beltbelt
should be such that a firm push with the thumbshould be such that a firm push with the thumb
at a point midway between the two pulleys willat a point midway between the two pulleys will
deflect the belt deflect the belt approximately 3/8” (9.approximately 3/8” (9.5 mm). 5 mm). IfIf
the deflection of the belt is more than 3/8” (9.5the deflection of the belt is more than 3/8” (9.5
mm), adjust the belt tension.mm), adjust the belt tension.
22 CheCheck thck the cone condendenser fser for debor debris aris and clnd clean ifean if
engage the clutch of the compressor (refer toengage the clutch of the compressor (refer to
DrierDrierin this section).in this section).
7.7. CheCheck thck the air coe air conditnditionioning hoing hoses ases and fitnd fittintingsgs
for leaks. for leaks. If a leak If a leak is detected, is detected, the refrigerantthe refrigerant
must be recovered prior to making repairs.must be recovered prior to making repairs.
NOTE:NOTE: The Clean Air The Clean Air Act, passed Act, passed in 1992, speci-in 1992, speci-
fies that anyone who works on vehicle air condi-fies that anyone who works on vehicle air condi-
tioning systems must be certified by an EPAtioning systems must be certified by an EPA
approved approved agencyagency..
8.8. For aFor any fny further urther repairrepairs, cs, contacontact a t a certicertified fied airair
conditioning repair technician.conditioning repair technician.
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