Question about 1999 Oldsmobile Bravada

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No heat unless set at max temp. setting.

I HAVE TO MANUALLY MOVE THE DOOR TO SWITCH FROM HEAT TO AIR. EVEN WHEN THE AIR IS ON AND IT DOES STAY COOL IT STILL BLOWS HEAT. THE CLIMATE CONTROL DOESN'T WORK EITHER. My heat only works when turned to the highest setting. It makes no difference what the fan is set on, but it will only blow out hot air if at max heat. I also have no A/C but, I am currently having it recharged so we will see if that corrects the A/C problem! Does anyone have any suggestions?

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  • Oldsmobile Master
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Hey Summers,, Are you running the A/C with the temperature set at max heat?? If yes. STOP... the A/C is for COLD air..As far as the fan speeds not working....you may have a fan switch that is going bad..(my vehicle is doing this!)..

Posted on Jun 16, 2017

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Posted on Jan 02, 2017

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SOURCE: 1994 Olds Dual Climate Control blows cold on passenger side

the heat door is probably stuck.that why temp light flashing

Posted on Mar 18, 2009

  • 1 Answer

SOURCE: Climate control driver side blowing only hot air.

is it low on free-on?

Posted on May 18, 2009

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Tip

Climate control settings,on all vehicles


When using the ac on a hot summer day,or a mild spring day,the compressor runs all the time.If you set it to low,and turn the temp to cold or toward the warmer side,lets say cool,then the ac compressor runs also,it just cycles,on,and off.No matter what setting you are using on your ac control,the ac compressor stays on,using fuel.Get the most out of your ac,while it uses your fuel,to keep you comfortable.All vehicles have a MAX setting,or a recirculate setting.Always use this setting.I say,always use this setting,not only that,but use this setting.I stress this because you are pulling in air ,from the out side,that is warming the evaporator,and making the ac work harder to give you comfort.In the hot ,hot summer,the settings MAX,and recirculate,keep the air that is in the vehicle,in the vehicle.It recirculates the air,instead of bringing hot air inside the vehicle ,and bringing the temp,up,to a warmer temp.A lot of people don`t even know that this is on the control,or don`t know what it is for.Some times the recirculate button,or dial,will have a picture that looks like a C,but squared off at the corners.So folks,get more out of your vehicles cooling and heat system.Yes ,this will work on heat also,maybe not defrost,but on some cars,it will work.

on Dec 08, 2009 | Chevrolet 1500 Cars & Trucks

1 Answer

My Nissan Almera 2005 Model keeps blowing heat even when the switch is off. now when l turn on the aircon hot air is mixing with cold air. Could it be the blower resister?


Could be the diverter paddle control that moves to allow cold air or hot air into the duct. It may be staying in the heat position even when you set the control to cool.

Jan 02, 2015 | Nissan Cars & Trucks

1 Answer

Peugot 407 heater not working


You more than likely have a problem with the temperature control blend door inside the air ducting, this door sits between the heater core and the AC evaporator core and mixes the air for the desired temp at the registers/vents. More than likely it is sticking due to being warped from heat. To replace this door and its actuator requires the dash be removed from the car.

Feb 08, 2012 | Cars & Trucks

2 Answers

Only hot air blows out vent when switch is in cold or blue area even when ac is on


Could also be that you are out of Freon, Compress may have a leak. Try it on cold setting in the early morning if its not even cool and heats up fast then Rob is correct. ITs a damper/ temp problem which is eternal. You can tear apart you dash and check on the damper (looks like a doggie door) make sure nothing is in the way and the hinger isnt broken.....I hope you can fix it yourself..

May 13, 2009 | 2002 Nissan Maxima

1 Answer

Aircondition blows hot air on normal but blows cold air on max


The temp blend door rotates between allowing heat through the heater core, or cold air through the a/cevaporator, or a blending of the 2 by being anywhere between the two.

I would check the heater a/c control head first and hope it's just the control head.
----------------
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:
  • An A/C evaporator housing (19850) which is attached to the engine compartment side of the dash panel (01610). This assembly includes: (1) the A/C evaporator core (19860), (2) the suction accumulator/drier (19C836), (3) the A/C cycling switch (19E561), (4) an internal, A/C evaporator core orifice (19D990) located inside the inlet line to the A/C evaporator core, (5) a blower motor (18527), (6) a blower motor wheel (18504), (7) a heater blower motor switch resistor (18591), and (8) the A/C evaporator case (19897).
  • A heater air plenum chamber (18471) which attaches to the passenger compartment side of the dash panel. This assembly includes: (1) the outside/recirculating air inlet door, (2) the panel door, (3) the floor defrost door, (4) the temperature blend door, and (5) the heater core (18476).
  • Other components which link and/or control the heating and air conditioning systems include: (1) the A/C control (19980), (2) the ducts and registers, (3) the windshield defroster hose nozzle (18490), (4) the control cables, (5) the vacuum lines, (6) the refrigerant tubes and hoses, (7) the A/C compressor (19703), and (8) the A/C condenser core (19712).
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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.
  • A temperature control knob, which controls the position of the temperature blend door mounted on A/C evaporator housing (19850) assembly.
---------------------------
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.
--------------------------------
You have to almost remove the dash to get this part out.
Removal
  1. Disconnect battery ground cable.
  1. NOTE: Refer to Section 01-12 for instrument panel removal and installation procedure.

    Loosen instrument panel (04320) and pull back from cowl.
  1. Remove A/C electronic door actuator motor electrical connector from bracket on A/C evaporator housing.
  1. Remove three A/C electronic door actuator motor retaining screws.
  1. NOTE: The mounting bracket remains in place on the A/C evaporator housing.

    Lift A/C electronic door actuator motor vertically approximately 12mm (1/2 inch) to disengage it from bracket and actuator shaft, then pull A/C electronic door actuator motor back toward passenger compartment.
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Apr 25, 2009 | 1996 Ford Explorer

1 Answer

Heater stays at max temp, air conditioner hot except on max cool.


it sound like one of the flap in the duck work is not working. check your heat contrell unit in the dash

Mar 22, 2009 | 1998 Mercury Mountaineer

1 Answer

I CAN EITHER HAVE AIR COND. OR HEAT


your actuatior valva is bad.you can order 1 from auto parts giant online for about 45 bucks the dealer wnats 240.00 that will give the heat and air back

Feb 18, 2009 | 1999 Oldsmobile Bravada

1 Answer

1995 lincoln town car heater


the door opening & closing on Max a/c is the inside/outside air intake door.
The temp blend door is the one you are concernd about. It says you have to remove instrument panel for access. ouch!!!

-------------------------------------
A/C Electronic Door Actuator Motor
The A/C electronic door actuator motor (19E616) is located on top of the A/C evaporator core housing assembly.
  • Its function is to move the A/C air temperature control door on command from the control assembly.
  • The A/C electronic door actuator motor contains a reversible electric motor and a potentiometer. The potentiometer wiper is connected to the actuator output shaft and moves with the output shaft to indicate the position of the A/C air temperature control door.
  • Battery voltage is applied to the ends of the potentiometer. The voltage available at the wiper indicates the position of the potentiometer. The actuator wiper voltage is sent to the control module and matched with the wiper voltage of the module potentiometer. The printed circuit board then drives the actuator motor in the direction necessary to make the actuator wiper voltage agree with the control module wiper voltage.
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Dec 27, 2008 | 1995 Lincoln Town Car

2 Answers

Temp control switch does not regulate temp i get heat on all settings except max ac


switch prolly not bad but you might wanna look into your heater control valve. valve not closing and letting the hot coolant fill your heat exchanger rather than recycling it back to the cooling system. The heat is over powering your a/c system and you're only getting a bit of cooling when you have the a/c on max. try it out

Jul 20, 2008 | 1996 Ford Explorer

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