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2002 Nissan Altima - Heat doesn't get hot and doors get stuck

I had the air conditioner control unit replaced because the knob that switches from cold to hot was broken. The heat still blows warm air. The mechanic said that I need a heater control box because when he turns the new knob from cold to hot, the doors get stuck due to corrosion around the bushing(?). Nissan said that I just might need to replace the actuators, the blower resistor and all three doors.

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Did the switch break because it was stuck? If so, then yes, they will have to change actuators and doors. Does the fan work on all speed setting? If so then you do not need a blower resistor. The resistor pack only controls the current flow to change speeds of the fan.

Posted on Dec 05, 2008

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I have a 2002 taursus I have replaced the thermostat but still do not have HOT heat it is lukewarm. We disconnected the plug to the air conditioner because we noticed the line was cold as if was engaged....

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Nissan Altima no cool air blowing or hot air blowing

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Check for heat inside vehicle if warm replace coolant cap but keep an eye on temperature gauge as the ~Air lock may have moved on from heater matrix/core so proceedure needs to be carried out again from COLD.

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