2 2 Gllllllllll VI driven by the vibration damper pulley as are the belts Keeps impurities and air out of the system to for the other engine driven accessories refer to Drive minimize corrosion Belt Arrangement diagrams at the end of this section Allows atmospheric pressure no enter the system The steel wer vump imneller is pressed on the rw and equalize during mi down when s cooling of the shaft which rides in a bushing pressed into the System vacuum Occnl s cast iron housing The housing has a small hole to Seals the cooling system up to 15 pslpwssurel w S p f any p thu may q r Tm which raises the coolant boiling point approxi water pump seals are lubricated by antitreeze the mately 24 2 F per pound of pressure bearings are sealed and no additional lubrication is necessary The Tempatrol fan drive is a torque and temperature sensitive clutch unit which automatically Rubber h 0 00l t to f h heifer 1 Md increases or decreases fan speed to provide adequate radiator On vehicles with V 8 engines the heater core cooling fig 2 3 It is used with nenvyajngy Ol an cnn return hose is routed through a bracket attached to di1 i0ningc 0 ingsygggmg the carburetor choke housing The lower radiator hose on all models is spring reinforced to prevent collapsing caused by suction at the water pump inlet NOTE Coolant Temperature Override CTO switches are installed in the cooling system to control vacuum for emission control equipment Refer to Sectron a 4A Emiss ion Control for descrlptwn and operation A pelIet type thermostat controls operating tem perature of the coolant by controlling coolant flow to V the radiator The temperature sensitive pellet keeps ll the water control valve closed below 195 F causing V coolant to be recirculated within the engine or open E Moum ING above 195 F to allow coolant flow to the radiator This v I FLANGE provides quick warmup and overall temperature con Ql trol Stamped on the thermostat are the words UP and i TO RAD to indicate the proper installed position The f same thermostat is used winter and summer Engines should not be operated without a thermostat except u lLf E for servicing or testing Operating without a ther CHAMBER cL QE mostat causes longer engine warmup time poor war am 1 s 4l mup performance and slower heater warmup 1 With the thermostat open coolant flows into a fin and tube type radiator The radiator is composed of a top and bottom tank soldered to the cooling tubes On the upper tank is the filler neck which has an overflow 42415 tube that routes overboil to the road The bottom tank contains an oil cooler on vehicles equipped with Fly Z 3 l p r Ulm Fa automatic transmissions The radiator has a drain cock in the lower tank to permit draining of the d A himetal thermostatic coil at the front of the clutch unit reacts to changing radiator air tem S m d h v pL h d m h d peratures and regulates the flow of silicone fluid into funnel air more directly through the radiator for im the drive clmmbgrl The amount of fluid flowing lnm proved lmg the chamber provides automatic fan speed control in Fitted to the radiator filler neck is a radiator pres pr p m t the comm demmds of me gm sure cap consisting of a pressure valve and a vacuum The temperature page is an electrlcal instrument V V Th up p rf ms wleml f that indicates coolant temperature It responds to elec Prevents coolant loss when vehicle is in motion trical resistance changes of the sending unit which is