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COMPRESSOR  DRIVE  BELT  ALIGNMENT  AND.  TENSION CHECK
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CHECKING COMPRESSOR OIL LEVEL
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS AIR  CONDITIONING  PERFORMANCE  CHECK  (PRESSURE TEST) This performance test can be used to determine if the air  conditioning  system  is  properly  charged  and  functioning correctly. The   procedure   for   making   the   performance   check utilizing   the   SE-2443   Portable   Service   Station   is   outlined below. 1. Park   vehicle   in   an   area   with   low   air   movement. Place transmission in neutral and apply brake. 2. Open  cab  doors.    Close  all  cab  ventilators.    Raise hood. 3. Connect SE-2443 Service Station to air conditioning system service ports as follows: (See Fig.  35) a. Close   manifold   suction   and   pressure   gauge valves.  (Turn fully clockwise.) b. Remove cap from compressor suction service port.  Connect manifold suction gauge hose to compressor suction service port. c. Remove   cap   or   engine   fan   drive   override switch (if equipped) from compressor discharge service port. Connect   manifold   discharge   gauge   hose   to compressor discharge service port. Fig.  35   Manifold and Garage Set Connected to Compressor Service Port 4. Position  a  thermometer  about  305-610  mm  (12-24") in     front     of     vehicle     grille     to     measure     ambient temperature of air entering condenser. 5. Insert another thermometer through center of passenger   air   conditioning   air   outlet.     Do   not   let thermometer touch side of air duct. 6. Set   air   conditioning   controls   for   maximum   cooling (A/C lever at "COLD", blower switch on "HIGH"). 7. Operate  engine  at  RPM  specified  in  "Engine  Speed Chart"  under  SPECIFICATIONS  for  about  ten  (10) minutes.  Then: a. Observe  and  record  ambient  temperature  of air centering vehicle grille. b. Observe and record cool air outlet temperature. c. Observe   and   record   discharge   and   suction pressure gauge readings. 8. To   evaluate   air   conditioning   system   performance, compare   readings   obtained   in   Step   7   with   those listed  in  the  "Operating  Pressure  Test  Chart"  under SPECIFICATIONS. If readings obtained from vehicle are not within limits specified in the chart, refer to TROUBLE SHOOTING GUIDE   for   causes   of   abnormal   pressures.      Make necessary repairs. 9. After pressure test is completed disconnect manifold and gauge set hoses from compressor service ports. Install    cap    on    compressor    suction    service    port. Install  cap  or  fan  drive  override  switch  (if  equipped) on compressor discharge service port. IMPORTANT To  keep  foreign  material  out  of  manifold  and gauge set hoses, always attach ends of hoses to bracket on service station when not in use. 10. Check  air  conditioning  system  for  refrigerant  leaks using an electronic leak detector.  Follow equipment manufacturer's instructions. 11. Close hood and cab doors. DISCHARGING THE AIR CONDITIONING SYSTEM Whenever   it   becomes   necessary   to   open   the   air conditioning refrigerant system to remove or service components, the refrigerant charge must be removed from the system. To    discharge    the    system,    utilizing    the    SE-2443 Portable Service Station, proceed as outlined below: CTS-2731   Page 21 PRINTED IN UNITED STATES OF AMERICA

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