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There is no cabin ari filter on a 1991 Totyota Previa
The 1991 Toyota Corolla cooling fan will stay on all the time if the temperature sensor is malfunctioning. Replace the temperature sensor.
The location for the idle switch of a 1992 Toyota Previa mini van can be found in the Toyota Previa Auto Repair Manual 1991 thru 1995. This can be purchased from the Toyota dealership.
it weights 5.410 pds
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it has a 2.4li engine size for gasoline
.....still lookin'
It's inside the air cleaner housing.
I CHANGE MY OWN OIL IN MY 1991 PREVIA. 5W30 IS WHAT I HAVE USED FOR YEARS. PREVIA JUST PASSED THE 334,000 KM MARK
On the panel I think it says radio
5.8 quarts
Try and get someone to read the ECU codes, that will tell you if the problem is from the "Knock Sensor". If it is you will need to buy a new one and replace it. They are very expensive and can only be got from a Toyota Dealer. To fit your self Drill a hole under the front seat(Directly above the sensor) and replace from there. If you dont want to drill a hole you will have to drop the engine and that is not a cheap option on a previa.