Question about Nissan Xterra

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AC/heater blower only only works in level two or higher, and the AC only works in the first position! I know the cooling is good, because when It's on the 1 position it's very cool and if I turn it to hi, it blasts cold air for a moment but the AC light goes out and the air becomes warm.

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Sounds like the " credit card " type resistor that governs the fan speed is on the blink. The speed resistor is part of the system that lets the AC operate. It can be found by following the wires that come out of the fan motor ( usually blue but Nissan changes colors at random ) which is in the passengers footwell. The wires should go to a plug that goes into the ducting between the fan motor and the main heater unit in the centre of the car. Unplug the wires and you should see a couple of screws holding in the resistor ( helps if you can do Yoga as, to see the screws you will be upside down with your head in the footwell and your feet draped over the back of the seat.) The screws can be quite hard to remove, I usually use a right angle phillips screwdriver or a 1/4 spanner holding a hex #2 phillips bit.
Once the screws are removed , the resistor can be removed. The resistor should be the size and shape of a credit card with a circuit board type resistor printed on it. Look for burnt or discolored areas of the board. If damaged , replace. If the resistor looks ok, check the connections and connecting wires.
Happy hunting Marshall

Posted on May 02, 2010

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