Volvo Workshop Manuals
940 L4-2.3L SOHC VIN 88 B230F (1992)
Engine, Cooling and Exhaust > Cooling System > Coolant Pump <--> [Water Pump] > Component Information > Testing and Inspection > Verifying Water Pump Problem > Page 4054
Coolant Pump: Testing and Inspection
COOLING SYSTEM OPERATIONAL CHECK
NOTE: This vehicle may be equipped with an optional electric cooling fan.
IMPORTANT: Always verify the operation of the thermostat and cooling fan prior to driving the vehicle after a cooling system repair.
With the cooling system filled with coolant and the radiator cap installed, start the engine and allow the coolant to warm up.
The upper radiator hose should remain cool to the touch until the coolant within the engine block and head has reached the thermostat opening
The thermostat opening should be indicated by a rapid warm up of the upper radiator hose.
If upper hose gradually warms up, the thermostat may be stuck open (assuming the engine is started cold)
If the coolant temperature reaches the normal operating temperature (as indicated by the temperature gauge) before the upper hose becomes warm,
WARNING: Never remove the radiator cap, or disconnect a coolant hose on a warm engine. A warm cooling system may contain a large
After the cooling system has warmed up, turn off the engine, and verify the cooling fan clutch has engaged.
The clutch should offer resistance when attempting to rotate the fan by hand.
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