Chapter 15: Engine Cooling System
Questions With Correct Answers
The vengine vcooling vsystem v- vAnswer v- vthe vengines vinternal vcombustion vsystem vtakes vplace vat
vabout v4,500 vdegrees vfahrenheit. vApproximately vone-third vof v the vheat vproduced vby v combustion
vis vconverted vinto vthe vengines vpower. vAnother vthird vis vremoved vthrough v the vexhaust vsystem.
vThat vstill vleaves vone-third vof v the vheat vthat vis vdissipated vby vthe vengine vcooling vsystem. vIt vis va
vsealed vand vpressurized vsystem vthat v uses va v combination vof vequal v parts vwater vand v coolant
Coolant/antifreeze v- vAnswer v- vCoolant/antifreeze vis vadded vto vthe vwater vto vincrease vthe vboiling
vtemperature vof vthe vmixture. vOtherwise, vthe vwater vwould vevaporate vat vthe vengines vhigh
vtemperatures. vThe vaddition vof vcoolant vkeeps vthe v mixture vfrom vfreezing vin vthe vwinter vand v the
vengine vfrom vrusting. vMost vcoolant/antifreeze vcontains va vsubstance vcalled vethylene vglycol,
valthough vsome vuse vpropylene vglycol, vwhich vis vnon vtoxic vand vless vharmful.
Water vPump v- vAnswer v- vthe vwater vpumps vthe vwater-coolant vmixture vthrough vthe vengine vcooling
vsystem vvia va vlower vradiator vhose. vThe vwater vpump vis vpowered vby va vv vor vserpentine vbelt
vattached vto vthe v crankshaft. vOn v cars vwith vmechanical vfans vthe vwater vpump vis vgenerally vright
vbehind vthe vfan. v On v cars vwith velectric vfans v the vlocation vvaries. vOn vsome v cars vthe vwater vpump
vserves vtwo vpurposes: v driving vthe vfan vand vcirculating vcoolant
Water vjackets v- vAnswer v- vThe vcoolant vmixture vis vcirculated vthrough vareas vcalled vwater vjackerts
vthat vsurround v the vengine vcylinders vand vother vengine vhot vspots. vThe vheat vof vthe vcylinders vis
vtransferred vto vthe v cool vliquid vbeing vcirculated.
Fan v- vAnswer v- va vfan vmounted vbehind vthe vradiator vpulls vcool voutside vair vthrough vthe vradiator,
vcooling vthe vwater-coolant vmixture vas vit vtravels vthrough vthe vradiator. v There vare v two vtypes vof
vfans velectrical vand vmechanical. vMechanical vfans vare vmainly von vpick vup v trucks. vThe vmechanical
vfans voperates vby vmeans vof va vv-belt vor vserpentine vbelt vthat vconnects v to vthe v crankshaft. vThe
vnumber vof vfan vblades vvaries. vMost vprivate vpassenger vcars vhave velectric vfans
Fan vshroud v- vAnswer v- vPlastic vor vmetal vmounted vdirectly vto vthe vback vof vthe vradiator vthat
vforms va vtunnel v to v help vprotect v the vfan vand v channel vair vthrough vthe vradiator
Questions With Correct Answers
The vengine vcooling vsystem v- vAnswer v- vthe vengines vinternal vcombustion vsystem vtakes vplace vat
vabout v4,500 vdegrees vfahrenheit. vApproximately vone-third vof v the vheat vproduced vby v combustion
vis vconverted vinto vthe vengines vpower. vAnother vthird vis vremoved vthrough v the vexhaust vsystem.
vThat vstill vleaves vone-third vof v the vheat vthat vis vdissipated vby vthe vengine vcooling vsystem. vIt vis va
vsealed vand vpressurized vsystem vthat v uses va v combination vof vequal v parts vwater vand v coolant
Coolant/antifreeze v- vAnswer v- vCoolant/antifreeze vis vadded vto vthe vwater vto vincrease vthe vboiling
vtemperature vof vthe vmixture. vOtherwise, vthe vwater vwould vevaporate vat vthe vengines vhigh
vtemperatures. vThe vaddition vof vcoolant vkeeps vthe v mixture vfrom vfreezing vin vthe vwinter vand v the
vengine vfrom vrusting. vMost vcoolant/antifreeze vcontains va vsubstance vcalled vethylene vglycol,
valthough vsome vuse vpropylene vglycol, vwhich vis vnon vtoxic vand vless vharmful.
Water vPump v- vAnswer v- vthe vwater vpumps vthe vwater-coolant vmixture vthrough vthe vengine vcooling
vsystem vvia va vlower vradiator vhose. vThe vwater vpump vis vpowered vby va vv vor vserpentine vbelt
vattached vto vthe v crankshaft. vOn v cars vwith vmechanical vfans vthe vwater vpump vis vgenerally vright
vbehind vthe vfan. v On v cars vwith velectric vfans v the vlocation vvaries. vOn vsome v cars vthe vwater vpump
vserves vtwo vpurposes: v driving vthe vfan vand vcirculating vcoolant
Water vjackets v- vAnswer v- vThe vcoolant vmixture vis vcirculated vthrough vareas vcalled vwater vjackerts
vthat vsurround v the vengine vcylinders vand vother vengine vhot vspots. vThe vheat vof vthe vcylinders vis
vtransferred vto vthe v cool vliquid vbeing vcirculated.
Fan v- vAnswer v- va vfan vmounted vbehind vthe vradiator vpulls vcool voutside vair vthrough vthe vradiator,
vcooling vthe vwater-coolant vmixture vas vit vtravels vthrough vthe vradiator. v There vare v two vtypes vof
vfans velectrical vand vmechanical. vMechanical vfans vare vmainly von vpick vup v trucks. vThe vmechanical
vfans voperates vby vmeans vof va vv-belt vor vserpentine vbelt vthat vconnects v to vthe v crankshaft. vThe
vnumber vof vfan vblades vvaries. vMost vprivate vpassenger vcars vhave velectric vfans
Fan vshroud v- vAnswer v- vPlastic vor vmetal vmounted vdirectly vto vthe vback vof vthe vradiator vthat
vforms va vtunnel v to v help vprotect v the vfan vand v channel vair vthrough vthe vradiator
