Question about 2000 Nissan Altima

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2000 Altima GXE: Air Conditioning does not shut off

As stated in the subject, the air conditioning is always running. I turn the knob to the "off" position, but I still feel air coming out. I have verified it's air-conditioned because when I set the level to hot, hot air blows out, and when I set it to cold, icy breath comes my way. :(
It doesn't come out with much intensity, but it's always on, and I think it's eating up my gas.

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  • mnsmns Jun 17, 2008

    Nissan Altima 2000 GXE: The air conditioning is always running. I turn the knob to the "off"
    position, but I still feel air coming out. I have verified it's
    air-conditioned because when I set the level to hot, hot air blows out,
    and when I set it to cold, icy breath comes my way.
    It doesn't come out with much intensity, but it's always on, and I think it's eating up my gas.


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Air will always come out of vents but unless u have your a/c button pressed in and light on your a/c pump will remain disengaged and not use any more gas try tuneup and check tire press. to regain fuel economy

Posted on Jul 18, 2008

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How do I fix the air condition control buttons?


Well, I can't tell by your explanation if the knob stem is broken & just spinning around or if it feels normal and nothing happens.

So, I guess I would first have you check all the fuses labeled "AC" or "Heater". Might be just a blown fuse, but remember, fuses always blow for a reason. There are many things that can be causing your problem like the heater/ac fan speed relay or a broken wire, etc.

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D The gage moves a little when you turn a corner or United States Canada Your fuel gage tells you about how much fuel you have left, when the ignition is on. When the indicator nears empty, the light will come on and you will hear a chime. You still have a little fuel left, but you should get more soon. D The gage goes back to empty when you turn off the ignition. Section 3 Comfort Controls and Audio Systems In this section, you’ll find out how to operate the comfort control and audio systems offered with your vehicle. Be sure to read about the particular systems supplied with your vehicle. 3-2 3-2 3-4 3-4 3-5 3-6 3-6 3-7 3-7 3-7 Comfort Controls Climate Control System with Air Conditioning Air Conditioning Heating Defogging and Defrosting Windows Rear Window Defogger (If Equipped) Ventilation System Audio Systems Setting the Clock for Systems without Automatic Tone Control Setting the Clock for Systems with Automatic Tone Control 3-8 3-10 3-15 3-19 3-20 3-23 3-23 3-24 3-25 3-25 3-25 AM-FM Stereo AM-FM Stereo with Cassette Tape Player and Automatic Tone Control (If Equipped) AM-FM Stereo with Compact Disc Player and Automatic Tone Control (If Equipped) Remote Cassette Tape Player (If Equipped) Theft-Deterrent Feature (If Equipped) Understanding Radio Reception Tips About Your Audio System Care of Your Cassette Tape Player Care of Your Compact Discs Care of Your Compact Disc Player Fixed Mast Antenna Comfort Controls This section tells you how to make your air system work for you. With this system, you can control the ventilation and heating in your vehicle. Your vehicle also has the flow-through ventilation system described later in this section. Fan Knob The left knob selects the force of air you want. Turn the knob clockwise to increase fan speed and counterclockwise to decrease fan speed. To turn the fan off (which will also turn the climate control system off), turn the knob all the way counterclockwise. In any other setting, the fan will run continuously. The fan must be on to run the air conditioning compressor. Temperature Knob The center knob regulates the temperature of the air coming through the system. Mode Knob The right control knob changes the functions of the system. VENT : In this position most of the air comes through the instrument panel outlets.

A small amount of air comes through the floor outlets. Set the center control knob to the temperature desired. Climate Control System with Air Conditioning BI-LEVEL : In this position the air comes through the instrument panel outlets and through the floor outlets. Set the center control knob to the temperature desired. FLOOR : In this position most of the air comes through the floor outlet. The rest of the air comes through the windshield and side window outlets. Set the center control knob to the temperature desired. DEFOG : This position divides the air between the floor outlets and the windshield defroster outlet. The air conditioning compressor will run automatically in this position when it is needed to help dry the air in the vehicle. DEFROST : This position directs most of the air through the windshield defroster outlet. Some of the air goes to the floor outlets.

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I have the same problem with my windstar blower is fine but is coming cold air but no heat i dont know what to do can any one show me how to fix it thnx

First, feel the heater hoses going into the firewall under the hood. If they are hot, then you have hot engine coolant going into the heater core. If they are not hot, then you either have a bad thermostat or you are very low on engine coolant.

Next you need air flowing through the heater core so it can come out heated through your vents. If the iar is flowing somewhere else, your temp blend door is not moving because the bend door motor is bad or your temp knob on your heater controls is bad. The blend door motor is an electric motor.

Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob , mounted on the heater function selector switch, which is part of the heater control .
  • The function selector knob has the following positions: OFF, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST.
  • The heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318) . Refer to the System Airflow Schematic and Vacuum Control Charts.
  • An internal single-pole electrical switch is also controlled by the selector. The switch controls the electrical supply to the heater blower motor switch (18578) .
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
Temperature Control
The temperature control operates in the following manner:
  • Temperature control of the heater system is determined by the position of the temperature control knob (between COOL-BLUE and WARM-RED) of the heater control .
  • This control knob is connected to a potentiometer mounted in the heater control . This potentiometer is electrically connected to the electric blend door actuator that operates the A/C air temperature control door.


  • Movement of the control knob from COOL (Blue) to WARM (Red) causes a corresponding movement on the air temperature control door and determines the temperature that the system will maintain.
System uses a reheat method to provide conditioned air to the passenger compartment.
  • All airflow from the blower motor (18527) passes through the A/C evaporator housing .
  • Temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
  • Temperature blending is varied by the air temperature control door, which regulates the amount of air that flows through and/or around the heater core (18476) , where it is then mixed and distributed.
inside you plenum box:


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You would be wise to check all the small rubber hoses under the hood as it would appear that you have a vacuum leak preventing the airflow door from moving to any other position. Look for cracked /cracking, split hoses or disconnected hoses and replace as necessary.

Good Luck!
Rich Lilja

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