Question about 2002 Hyundai Accent

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How to kno if I need blend door? No heat or cool. If I turn on fan I hear a squeal under the hood.

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When you turn on fan,is air coming out of vents normal but not getting hot or cold.If no air is coming out,then blend door is shut,causing air to back up and maybe cause that noise,here are 2 links on how to replace blend door and blower motor,join the,at top right hand corner of page,it's so free,then you can use their repairs like me.I just had my evaporator replaced,it was clogged up,a mouse made a home in the box that holds it,air is suppose to go thru it,but it backed up and made a noise,had midas repair,cause freon had to be removed to replace part,it's located next to blower,your blend door flap is probably broken,just stays closed.

Posted on Oct 11, 2013


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Posted on Jan 02, 2017


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sounds like the electronic blend door is not functioning in the duct work.its a actuated trap door that blends the warm and cool air to give your custom temps on your temp dials.

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Air Temperature Control Blend Door Failure No Heat or no AC (dependes on where door sticks)

In all modern cars there is a tiny DC electric motor driven gear drive that moves a plastic door that blends heated and cooled air from the AC and the heater core, this is called (interestedly enough) the air temperature control blend door actuator. The motor that moves this door fails because the door starts sticking from warping, most common complaint is no heat but it can be no AC as well. To replace these parts (blend door and blend door actuator) you must remove the entire dash from the car. Always have this problem confirmed by a dealer or qualified repair shop as it is a very expensive repair.

Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.

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im not sure how to remedy the heat problem, make sure the heater core is actually hooked up as many people simply run a bypass. I do know that you need to return the vacuum items because if there is a cable that means it is not vacuum actuated. the gunk may well be radiator or headgasket sealant which unfortunatly causes blockages and buildup in heater cores. i would suggest giving closer inspection to the heater core because everything else you have done is spot on. good luck

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Control settings will not change so the blower fan does not push any heat or defrost.

It sounds like the blend door is not switching. Many times a broken vacum hose under neath the hood will cause this. The blend door is vacum operated, if one of the hoses is cracked you wont have a functioning blend door. Usually with the vehicle running and hood open you may hear a hising noise. Locate it and fix it.

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When i turn on the heat the cooling fan kicks on and the temp drops way down.

The cooling fan as in the one in front of the radiator? This fan also comes on when the AC is turned on, It sounds like your ac is turning on (the knob is probably on the defroster setting) and your blend door is probably stuck in the cool position.Try changing the air distribution from to a few different positions and see if it helps, this will help you figure out if you have a stuck blend door or another fault.

Nov 30, 2010 | 2000 Mercury Sable

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I think that the servo controlled temperature door is sticking in the closed position. We can turn the dial on the temp selector to warm things up a bit & no change occurs. After messing with the...

You are correct about the main blend door sticking friend. And it happens to cover the heater core part of the box under the dash on the passenger side. Look under the hood at the firewall and see where the hoses connect to the heater core. That's the position your looking for. Could also be just a tight bend in a vacuum line from the blend switch valve to the door itself. Everything to do with heat and A?C is vacuum actuated from a vacuum canister under the hood. A black round ball about 4 inches in diameter.

Jul 07, 2017 | 2005 Chevrolet Malibu

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Heater stopped putting out heat, blower works fine air conditioning works fine

What you are saying is when you turn knob to hot you don't get any heat.? Let's start with the basics. Make sure your cooling system is filled up with coolant. Then with the engine warmedup and the temp gauge on the dash indicating between H and C. Find your heater hoses under the hood and feel them. Are they BOTH very warm or hot? os is only 1 warm and the other cool? If both are warm/hot, and still not getting heat from your vents. You have a problem with either the temp controller or the blends doors under the dash. usually the blend doors and it requires removal of the dashboard to get to it. If the heater hoses are wrm and cold then you may have a plugged heater core or water pump not circulating properly.

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200 Jeep Laredo..Air is cold and fan is blowing,

there is a blend door actuator for the laredo and if is bad the air wont come out here is a pic of what it looks like and how to get to it

The single zone heater-A/C system is equipped with a single blend door actuator. The dual zone system has two blend door actuators, one for the driver side blend-air door and one for the passenger side blend-air door.
  1. Disconnect and isolate the negative battery cable.
  2. Remove the glove box from the instrument panel.
  3. Remove the three screws that secure the blend door actuator to the passenger side of the HVAC air distribution housing .
  4. Remove the blend door actuator from the air distribution housing and disconnect the HVAC wire harness connector from the actuator.
  5. Remove the blend door actuator from the vehicle
to instal
  1. Position the blend door actuator into the vehicle.
  2. Install the blend door actuator onto the passenger side of the HVAC air distribution housing . If necessary, rotate the actuator slightly to align the splines on the actuator output shaft with those on the blend door cam .
  3. Install the screws that secure the blend door actuator to the passenger side of the air distribution housing . Tighten the screws to 17 inch lbs. (2 Nm).
  4. Connect the HVAC wire harness connector to the blend door actuator.
  5. Install the glove box into the instrument panel.
  6. Reconnect the negative battery cable.

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