Auxiliary Water Pump: Description and Operation
ELECTRIC COOLANT PUMPElectric Coolant Pump:
The electric coolant pump ensures the uniform flow of coolant through the heater core without bubbles, even at low speeds. The electric coolant pump is located in the left side of the engine compartment near the battery and is controlled by the A/C-heater control.
The electric coolant pump housing contains two coolant hose connections and an electric motor which drives the vane-type pump using a magnetic clutch.
The electric coolant pump is controlled by the ATC A/C-heater control and is only operational when the ignition switch is on under the following conditions:
1. Vehicle speed below 27 Km/h (17 mph).
2. Coolant temperature above 65° C (150° F) but less than 110° C (230° F).
3. Any blower motor speed setting.
4. Temperature heat setting above the halfway setting (60% heat).
5. The pump will turn off at speeds above 48 Km/h (30 mph).
6. The pump will turn off if the coolant temperature rises above 110° C (230° F).