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 4055
When the engine is cold the fan should spin freely on the clutch.
Thermostat Closed, Cold Engine - With the thermostat closed, coolant flow through the radiator is blocked forcing the coolant to re-circulate
Thermostat Open, Warm Engine - Once the coolant has reached normal operating temperature, the thermostat begins to open, allowing coolant
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