the reason it wont circulate is cuz u radiator is clogged or plugged flush it or buy a new one
Thermostat could be stuck shut. Or the water pump could be failing.
remove the radiator, then remove 4 screws that holds the fan ,,done..
To flush a Toyota Previa radiator, first drain the antifreeze in the radiator into a bucket. This is done by turning the valve at the bottom of the radiator. Close the valve and add a radiator flush product purchased at an automotive parts store. Follow the directions on the bottle of flush. This usually means running the vehicle for a certain amount of time and then draining the radiator again.
Toyota Previa was created in 1990.
Raise hood look down you will see hoses that is it in front behind grill
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