cooling systems part 2 Flashcards
two most common problems with cooling systems
to hot
to cold
first thing to check when trouble shooting cooling systems
coolant level
visual inspection of rad core
check for dirt a debris build up
bent tubes and fins
bent fin repair
bent fins can be repaired with a fin comb
when using compressed air to clean a rad
use low pressure
90 degrees to rad tubes and fins
keep nozzle safe distance away from tubes and fins
coolant leak checks
check for coolant puddles under unit
pressure cap may be malfunctioned or wrong cap
drive belt that is to loose will cause
water pump will not be able to drive as fast and consistently as required
drive belt that is to tight
pre mature wear of bearings on water pump shaft resulting in seal and bearing damage
excessive end play at one assembly equipped with a drive pulley
may cause the drive belt to wear uneven or fly of the pulleys
when checking cooling fans
always check when engine is shut down
when observing moving fan assembly
always stand in front or behind never stand beside or parallel with moving fan
fan blades have been known to fly off and kill techs
when removing pressure cap off rad
always cover with a heavy rag or cloth
wear gloves and keep face towards the side
remove cap slowly
when pressure testing rad
use pressure no more than 10% of rated cap psi
check for external leaks
dye can be placed in cooling system for ease of detection
if no external leaks but psi keeps dropping
an internal leak may be the cause
two indications of internal cooling leak
white smoke out exhaust
dipstick may have frothy white contamination
