Well in my case (91) previa the connection inside f the blower housing had vibrated loose.
shaking the blower resister
In a 1991 Toyota Previa, the heater fan blower is located under the dashboard on the passenger side. You'll need to remove the lower dash panel to access it. The blower motor is typically mounted on the firewall, and you may need to disconnect electrical connections and possibly the blower motor housing to replace or service it.
if you can manually move it with you hands them u need to tighten the nut on the arm
Toyota Previa was created in 1990.
There are a number of reasons why your Toyota Previa will not start. You should ensure that the battery is working properly, that the engine is able to pump fuel and if you cannot resolve the problem, you should call a mechanic.
how to replace a heater matrix in a toyota previa
yes
Raise the hood, remove the inlet shroud to the blower housing, then remove the top half of the radiator fan shroud. Next start removing the screws that hold a protective cover that is below the blower motor. There are 4 screws and one bolt that secure this. Let this cover drop down and then the blower resistor can be seen behind the blower motor. Remove the electrical connection plug and then the two screws that hold the resistor in place. Go to this site for great Previa info: http://autos.groups.yahoo.com/group/previa/
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Not all toyota previa are automatic supercharged as some are manual.