Cooling system
Cooling System Components Antifreeze/coolant Thermostat Water pump Radiator Radiator pressure cap Expansion tank Hoses Water outlet Water jackets Cooling fans Temperature indicators
Cooling System Components (Cont’d)
50/50
Premixed coolant
Cooling System Service Pressure test the system for leaks. Check coolant condition and strength using a hydrometer. Check radiator cap for proper pressure. Test thermostat for proper opening and closing temperatures.
Cooling System Service (Cont’d) Check hoses for leaks and swelling. Check the system with a voltmeter for electrochemical degradation. Check water pump for bearing failure and leaks. Check cooling fans and fan clutch for proper operation.
Common Causes of Water Pump Bearing Failure A bent fan A missing piece of fan blade A cracked fan blade Fan mounting surfaces that are not flush A worn fan clutch
Water Pump
Fan
Clutch fan Filled with a silicone fluid Some have a thermostatic spring on the front of the clutch that is temp sensitive. Visual and physical inspection.
Basic tests The basic procedure for testing a vehicle’s cooling system includes inspecting components and testing for external and internal leaks. Belt problems are easily discovered by visual inspection or by the sound of slippage.
Quick fix ? To stop leak or not to stop leak. That is the question. What else could go wrong here?
Thermostat Design
Radiator Cap
Hose Clamps Worm gear clamp Screw tower clamp Spring clamp Twin wire clamp Rolled edge clamp Heat shrink clamp
Don't Get Hosed!
Check the Belt
Smooth to Smooth Groove to Groove