TM 5-3810-207-20/TO 36C23-3-37-12 Section III.  CRANE ENGINE COOLING SYSTEM 95.  General The    engine    temperature    is    controlled    by    the circulation of coolant through  the  coolant pump, which forces the coolant through the engine water jackets and back into the radiator for cooling.  Until the engine is up to   operating   temperature,   all   or   part   of   the   coolant leaving    the    engine    is    bypassed,    by    means    of    a thermostat,    directly    to    the    pump    for    recirculation. Draincocks are located on the bottom of the radiator and on the forward, left side of the engine block. 96.  Hose, Lines, and Fittings a. Removal. (1) Drain the cooling system (TM 5 3810-207- 10). (2) Remove  the  hose,  lines,  and  fittings  as instructed on figure 33. b. Cleaning and Inspection. (1) Clean      all   parts   with      an      approved cleaning solvent. (2) Inspect    hose    and    fittings    for    cracks, breaks,  and  other  damage.    Replace  all defective parts. c. Installation. (1) Install   the   hose,   lines,   and   fittings   as illustrated on figure 33. (2) Fill radiator with coolant (TM 5-3810-207- 10). 97. Thermostat Housing Assembly a. Removal. (1) Remove  the  radiator-thermostat  housing hose and pipe assembly (par. 96). (2) Remove the thermostat housing as instructed on figure 34. b. Cleaning and Inspection. (1) Clean all parts thoroughly. (2) Inspect the thermostat housing for breaks, cracks,    and    other    damage.        Replace defective thermostat housing. c. Installation. (1) Install the thermostat housing as illustrated on figure 34. (2) Install  the  pipe  assembly  and  radiator-to- thermostat housing hose (par.  96). 98.  Thermostat Assembly a. Removal. (1) Remove    the    thermostat    housing    (par. 97). (2) Remove    the    thermostat    assembly    as instructed on figure 35. b. Cleaning and Inspection. (1) Clean    the    thermostat    in    an    approved cleaning solvent. (2) Inspect   the   thermostat   and   gasket   for proper function and other damage. Replace defective thermostat. c. Test.      Test   the   thermostat   for   opening   and closing   range   of   165° to   180 ^o F.      by   placing   the thermostat  in  a  container  of  water  that  can  be  heated and   checked   with   an   accurate   thermometer.      If   the thermostat  opens  before  165 ° F.,  closes  after  180 o F., or does not open or close at all, replace the thermostat. d. Installation. (1) Install   the   thermostat   as   illustrated   on figure 35. (2) Install the thermostat housing (par. 97). 99.  Radiator Shroud and Fan Guard a. Removal.      Remove   radiator   shroud   and   fan guard as instructed on figure 36. b. Cleaning and Inspection. (1) Clean  the  radiator  shroud  and  fan  guard with an approved cleaning solvent. (2) Inspect the shroud for breaks, bends, and other damage.  Replace defective shroud. c. Installation.    Install  the  radiator  shroud  and  fan guard as illustrated on figure 36. 59