Question about 1998 Mercury Grand Marquis

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My air conditioner is working but won't blow out

The switch that controls the hot and cold air through the vents stopped working is there a simple fix please help summer in Florida brutal

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  • Mercury Master
  • 4,369 Answers

Are you saying the temp blend door is not working?
If yes, it's the control head or the temp blend door motor on th plenum case under the dash. Buy used on ebay.

DO you have manaul or electroic controls?

If electronic

A/C Electronic Blend Door Actuator The A/C electronic blend door actuator is located on top of the A/C evaporator core housing (19A553) assembly.

  • Its function is to move the A/C air temperature control door on command from the control assembly.
  • The A/C electronic blend door actuator 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.
  • A five volt signal is applied to the ends of the potentiometer. The voltage available at the wiper indicates the position of the potentiometer. The expressed value of 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 whichever direction is necessary to make the actuator wiper voltage agree with the control module wiper voltage.
-----------------------------------------------------------
manual

#3 is the blend door.

My air conditioner is working but won't blow out - 0425af0.gif

Posted on May 08, 2010

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

  • 192 Answers

SOURCE: air conditioner blows hot air from dash

On most cars when you push a button or slide a lever to change your choice of location where you want the air to blow out louvers move inside the dash to redirect the air to your chosen location. When you switch from heat to AC other louvers move. These louvers are often powered by vacuum lines running from the engine. If one of these louvers is stuck or if you have a vacuum leak in one of the lines it may be causing your problem.

Posted on May 12, 2009

  • 77 Answers

SOURCE: 2003 accord air conditioner

This is a common problem when the AC system has a low charge.
If this is the case, you have a leak somewhere. Do not try to fix it yourself without the proper equipment.

Posted on May 21, 2009

  • 37 Answers

SOURCE: Heat wont blow through heater or defroster vents

The door in the heater box is most likely stuck. It is located under the dash on the passenger side

Posted on Dec 06, 2008

  • 1 Answer

SOURCE: Air Conditioner only works on the driver's side

Can someone who has had the problem , provide the solution? I want to thank you in advance if you have the answer.
Z from North Carolina

Posted on Aug 16, 2009

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1 Answer

What caused heat to stop working?


same answer on all cars. nice photo, so rare here, shocking that.
in order,......
1: sure the blower must blow.
2: the engine must get to min. 180F , if not, thermostat bad in engine.
3: ok, engine is hot, so the heater core must get hot next. it has 2 hoses, we feel them with hands, are both hot?, yes, then the core is most-likely hot. (inside) (if not core is packed in gunk inside)
ever do 2year cooling flushes< (oops. zero service lands you here)
4: the controls must open the dampers, if not? bad controls
5: if the controls work and dampers fail, then the dampers are bad.


all answers assumes , cooling system full to top of RAD.
your car uses 3 damper motors. (electric)
that operate them by controls
the motor for temp is called temperature actuator motor.
the controller is called HVAC controller
did you scan the PLC to see if HVAC controller has errors.
the controller needs fuse 15 good. Cab fuse box ."hvac-rfa"
the controller use a network, data comm .
if you scan the PCM and it tells you the HVac comms are dead
what do you know? (means you cant fix it)
its not just a simple switch like in 1990 (gone)
its all computer controlled now.


26094348-k5quzreiqde4k1egefe3gt0o-2-0.jpg
check fuse first
scan 2nd.
like we do on all modern cars, or , its all just a guessing game.

Feb 14, 2016 | 2008 Suzuki XL7

1 Answer

99 air conditioner switch


im not sure what fails here.
no air, from all vents. no cold air , no hot air.
tell me what you want.? hot or cold air. (or defrost)
does the blower blow on high?
did you check all fuses. 1st.
if real serious. on DIY repairs, try the FSM.
or a great subs. alldata.com

Jan 01, 2014 | 1999 Toyota Camry

1 Answer

The heater in my 1999 Land Rover Discovery Series 1 won't blow cold.


As per your problem mentioned.There are few solved help links to troubleshoot these problems.Go through the list and Click the link below:----
Air conditioner blows air but not cold air http://repairhelpcenter.blogspot.in/2012/07/air-conditioner-blows-air-but-not-cold.html

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Car overheats and Air blows hot at idle? http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html

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Heater blows cold? http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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Heat blows cold on drivers side and hot on passenger side? http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html---------- Hot air on the driver's side vents only? http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

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2005 Chrysler PT Cruiser: A/C Blows Warm? http://whoisbyme.blogspot.in/2012/06/2005-chrysler-pt-cruiser-ac-blows-warm.html

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1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold? http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

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No heat, blower blows only cold? http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

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These will help.
Thanks.

Nov 22, 2012 | Cars & Trucks

1 Answer

Driver side air on the duel climate control is blowing hot and the rest of the vents are cold


Joey i had a similar problem in my 2000...The problem lies in the A/C Actuator. The Actuator is what opens and closes the vents, when the vents are open it allows hot air to flow through and when thier closed it prevents hot air coming in while air conditioner is running. depending on the year some vehicles require an upper and lower actuator. they are fairly simple to replace, and dont take much time. most actuators are located under the control switch box (radio, a/c dials) parts run about 60.00 each.

Sep 11, 2010 | 2002 GMC Sierra C/K1500

1 Answer

2001 Suburban: I have a 2001 chevy suburban and the air condition...


if its the computer climate controlled series then it might be the the vents. what happenes some times is the vent wont switch over from hot to cold or vise-versa. i had the same problem but reversed, no heat in front and it worked up to the last time i had switched it from hot to cold.
give it a shot, best of luck

May 18, 2010 | 2001 Chevrolet Suburban

2 Answers

2003 Grand Prix not blowing hot air. Does the heater coil need to be replaced? If so where is it located?


If the heater coil was bad, it would be leaking radiator fluid... probably into your dash/floorboard (depending on where it is installed in your model car). There is a switch that diverts the hot radiator fluid through the heater coil when you want heat. There is also an air diverter valve that helps to mix the hot and cold air. The fluid valve is controlled by the A/C settings control. The one that you use to choose between heater/air conditioner/vent/ defrost. The air diverter is controlled by the temp mixing controller. The most simple explanation is that one of those valves or the controller of one of those valves is not working. If the hot water cant be diverted through the heater coil, the coil can't exchange the heat (warming the air). If the air diverter (hot/cold controller) cant move to add heat, then all you will feel is air from the vent side (from outside) or from the A/C cooling the air.

I would guess that its either a controller or one of the valves themselves. Odds are, it is a controller. That tends to be what malfunctions first.

Feb 25, 2010 | 2003 Pontiac Grand Prix

1 Answer

Air Conditioner only works on the driver's side


Can someone who has had the problem , provide the solution? I want to thank you in advance if you have the answer.
Z from North Carolina

Jul 14, 2009 | 2003 BMW 325

1 Answer

2003 accord air conditioner


This is a common problem when the AC system has a low charge.
If this is the case, you have a leak somewhere. Do not try to fix it yourself without the proper equipment.

May 21, 2009 | 2006 Honda Accord

1 Answer

Hot air coming out of vent when air is on.


put some frion in and change out the antifreeze

Apr 19, 2009 | 2001 Ford F150 Styleside SuperCrew

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