Question about 1996 Mazda Pickup

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1996 B2300 4 cyl, All positions on the Heat/A/C selector blow hot, except Max A/C. At Max A/C it will cool the truck down but if at any other position, it's blowing full hot with temp selector set on cold. I changed the vacuum actuated valve under the hood that the 4 heater hoses are connected to, but no help.

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  • dgallagher4 Oct 16, 2010

    Followed your suggestions. Checked Fuses #18 and #10, both checked good. Checked Function Control Cable and Temp Control Door Cable and both checked good. Back to square one. Thanks for the help.

  • dgallagher4 Oct 22, 2010

    I checked all items that 1kbron suggested and I found nothing wrong. What should i check next or replace? Thanks

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Under the dash on the passenger side there is a cable for temp control. When you move the temp from blue to red you should see it move. This opens a door to the heater core. The cable is either broke or not operating the door or the door is broke, or the cable just came loose. But it is under the dash up in where the passengers feet would kick if they kicked straight up under the dash.

Posted on Oct 22, 2010

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  • Master
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Hi!
On the passenger compartment Fuse Box, check fuse #18 15A and fuse #10 10A, also, make sure that the Ground connection on the engine compartment, center of the left fender is not loose or corroded. If fuses and ground are OK, check Function Control and Temp. Control Door operation cable may need adjustment, the Temp. Control Door is located on the Blower Housing under dash.
ADJUSTMENTS
FUNCTION CONTROL CABLE Set function lever in defrost detent. Attach cable end to function cam. Pull on cam jacket (White) until cam travel stops. Push cable jacket into clip from top until it snaps into place. Operate blower on high speed and actuate lever. Check for proper operation.
TEMPERATURE CONTROL DOOR CABLE Set temperature lever at cool setting. Attach cable end wire to temperature door cam. Push gently on cable jacket (Black), until resistance is felt, to seat blend door. Push cable jacket into clip from top until it snaps into place. Operate blower on high speed and actuate lever. Check for proper operation.
Good Luck!! Keep me posted!!

Posted on Oct 14, 2010

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here is a descripton of the system.

Section 12-03A: Air Conditioning, Heater System, Manual, Ranger and Explorer 1996 Ranger and Explorer Workshop Manual
DESCRIPTION AND OPERATION A/C-Heater System, Manual The manual air conditioning/heater system used in these vehicles is a split-case, blend air design. This design includes the following major components:
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The A/C control (19980) assembly consists of three main parts:
  • The function selector knob, a vacuum selector valve combined with an internal electrical switch.
  • Heater blower motor switch (18578), an electrical switch that provides four speeds of A/C blower motor operation.
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---------------------------
Temperature Control
The temperature selector actuates a variable resistance switch. This switch varies the voltage to an electric actuator used to position the temperature blend door. Positioning the temperature control in any position between COOL and WARM causes the temperature blend door to direct more or less outside air through or around the heater core (18476) for whatever proportion of heated or unheated outside air is desired. The air blends together as it leaves the heater core and enters the heater air plenum chamber (18471) for distribution.
---------------------------
System Airflow Description Air is drawn into the system by the blower motor (18527) through the outside-recirc. door opening. The air is blown through the A/C evaporator core (19860) and then the heater core (18476) (when the temperature control is moved toward the WARM position). When the temperature blend door is in the maximum COOL position, the air bypasses the heater core. When the temperature control is moved to the right, away from the maximum COOL position, air passes through the heater core where it is warmed, and then mixed with the cool air before it is discharged through the registers. OFF
With the function selector in the OFF position, the outside-recirc. door is in the recirculated air position. It is closed to outside air and no air passes through the system. The blower motor is off. MAX A/C
NOTE: No temperature modulation is possible in the MAX A/C position.

In the MAX A/C position, the outside-recirc. air door is in the recirculated air position. All of the air discharges through the panel registers except for a small amount of floor bleed. The A/C compressor (19703) operates in this function control setting.
--------------------------------
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Removal
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