TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 BODIES AND CABS Make sure control cables are properly adjusted.  (See control cable adjustment instructions outlined elsewhere in this section.  ) 2. It  is  most  important  that  all  refrigerant  fittings  and "O"  rings  be  lubricated  with  refrigeration  oil  to  allow the connections to seat squarely and to be tightened evenly to the specified torque.  It is nearly impossible to attain the correct torque with a dry fitting. Do not attempt to disconnect or reconnect refrigerant fittings with only one wrench. Always use a back-up wrench    when    loosening    or    tightening    fittings    to prevent damage to hoses, lines or components. When  tightening  refrigerant  connections,  use  only  a torque  wrench  known  to  be  accurate.  It  should  be noted   that   torque   values   specified   in   the   "Torque Chart"    are    for    original    components    with    fittings manufactured   from   specific   materials;   i.e.      brass, aluminum,  etc.    These  torque  values  may  not  be correct for substitute components.  Use only genuine IH replacement parts. 3. Be   certain   that   the   evaporator   core   temperature control   sensing   bulb   is   properly   inserted   into   the evaporator core. 4. The expansion valve refrigerant temperature sensing tube  must  be  securely  attached  to  the  evaporator refrigerant outlet tube.  Also, the temperature sensing tube  and  expansion  valve  must  be  tightly  wrapped with     insulating     tape     to     prevent     the     ambient tempeature   from   affecting   correct   sensing   of   the temperature of the refrigerant leaving the evaporator. 5. All  refrigerant  hose  and  tubing support  clamps  and strap   locks   must   be   reinstalled   in   their   original positions. 6. The  freon  compressor  oil  level  must  be  maintained as specified.  (See SPECIFICATIONS and "Checking Compressor Oil Level" under SERVICE OPERATIONS.) 7. Last   but   certainly   not   least   is   cleanliness.   When removing components of the air conditioning system, all    openings    should    be    immediately    covered    or plugged     during     removal     and     remain     so     until reinstallation to prevent the entry of dirt, moisture or other foreign material. BLOWER MOTOR AND FAN Removal: 1. Make sure key and blower fan switches are "OFF ". 2. Remove cover from right side of instrument panel. 3. Remove cover from heater/evaporator unit. 4. Disconnect    blower    motor    wiring    connector    and ground wire. 5. Disconnect   motor   cooling   air   hose   from   blower housing (where equipped). 6. Remove  mounting  screws  and  remove  motor/  fan assembly from blower housing (Fig.  38). 7. Remove fan from motor shaft as follows: a. Remove fan lock nut. b. Remove fan from motor shaft. c. Pry metal spacer from motor side of fan. Fig. 38  Blower Motor/Fan Removal Installation: 1. Install fan on motor shaft as follows: a. Position   metal   spacer   in   shaft   hole   (motor side) of fan. b. Position fan on motor shaft. c. Install  fan  lock  nut  and  tighten  to  1.4  to  1.7 N.m (12-15 in.lbs.). 2. Install  motor/fan  assembly  on  blower  housing  and install mounting screws. 3. Connect  motor  cooling  air  hose  to  outlet on  blower housing (where equipped). 4. Connect blower wiring connector and ground wire. CTS-2731  Page 25 PRINTED IN UNITED STATES OF AMERICA