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I am working on a 2004 Chevy SSR. One of the blend doors is not closing completely in the heater control box. With the ignition in the run position, the door keeps "cycling" between closed and 1/4" open, motor can be heard running, makes a thumping noise each time door closes. If the fan is turned on or defrost is selected, the door opens completely and functions normally. Any ideas?

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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this is caused by loss of vacuum from the engine to the ac control head.

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SOURCE: 2004 silverado ac selection ie defrost floor dash

Control panels tend to fail or that model.

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SOURCE: cant get back door to stay closed

It sounds to me ( correct me if I'm wrong ) like the door latch on the side vertical edge of the door is in the LOCKED POSITION. In order to unlock it perform the following. First electrically with the LOCK button UNLOCK the locks. Now with one hand hold the OUTSIDE DOOR HANDLE IN THE OPEN POSITION, while at the same time FLIPPING OPEN THE LATCH. All Done . Now you can close the door. Hope this helps

Posted on Jun 27, 2009

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where is the flaaper down located at in a windstar

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SOURCE: 1997 explorer a/c blend door ?

may possibly have a vacuum leak.

Posted on Apr 07, 2010

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I replaced the heat blend actuator because I was not getting any heat. Now, after replacing, all I get is hot air and no cold. The A/C was working fine just before replacing.

Do you have Manual Climate Control System or Dual Automatic Temperature Control System ?
The temperature control switch:
  • is a potentiometer that outputs a variable voltage to the temperature blend door actuator to set the position of the temperature blend door.
  • initiates closing of the heater control valve. When set to full COOL, a lever on the temperature blend door pivot shaft depresses the pintle of the heater control valve vacuum switch. The heater control valve vacuum switch then applies vacuum to the heater control valve, closing off engine coolant flow to the heater core.
  • is serviced only with the climate control assembly.
You may have disturbed something when changing the actuator , the vacuum switch o vacuum hose .

Oct 21, 2015 | 2005 Ford Explorer XLT

1 Answer

The heater blows cold air on the drivers side and hot air on the passangers side?

temp blend door problem. either actuator motor bad, door broke inside heater box, or somthing interfearing with it closing. it could be an electrical issue w controller as well.

Feb 16, 2013 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

Front heater dont work but back does

Sounds like the heater control actuator/door isn't opening. Should be under the dash middle to passengers side... on the heater box. The temp switch on the dash causes the actuator to open and close the baffle/door. It may have an arm thet moves the door or it might be that the actuator itself mounts to the heater box. With vehicle running, turn the temp control and watch to see if the actuator is moving. One actuator will move to position the defrost/mix/vent/floor... usually on the drivers side middle... the other should open the heater blend door. Usually hard to get to on most vehicles. Hope this helps, Mike

Dec 30, 2010 | 1997 Ford Expedition

1 Answer

Have a 1998 dodge caravan blows cold only new thermastst flushed system new anti freeze help

Most likely the problem is a broken blend door inside the heater box or a broken adjuster cable going to the blend door, the blend door inside the heater box is responsible for heater output depending on your temp adjustment on your heater control panel, most likely the blend door is stuck in the cold position allowing cold air to come through the vents verses allowing the blower motor to blow warm air past the hot heater core to produce heat, check the temperature adjuster cable behind your heater controls and make sure its connected and not broken, lastly make sure the blend door isnt broken and operating freely.

Dec 06, 2010 | 2000 Dodge Caravan

1 Answer

Hi..i put in the thing in the AC to make it get cool..and hot air still coming out of the vent..its not blowing cold...even the compressor comes on...but only one of the fans come on...can u help me...

The blend door is inside the box where the air flows from outside into the car. The air goes through the air conditioner first, then it goes to the blend door. When the door is open, the air will then go thru the heater and get hot. When the door is closed, the cold air will come out the vents. In this way, the blend door controls how much air goes thru the heater. When you are running the A/C, you want the blend door closed. If your a/c compressor is working but you are not getting cold air, the blend door may be stuck open.
My book shows your blend door is behind the glove box. It also says your door is controlled by a cable. What you should do is look behind the glove box to see what happens when you change the temperature on the panel. It should move a cable behind the glove box that turns a lever on the door. The cable should turn the lever as far as it will go. If it doesn't do that, it is either broken or needs to be adjusted. It may have slipped out of it's clamp. To adjust, loosen the clamp, turn the knob to cold, and push the door fully closed, then tighten the clamp.

Let me know if it doesn't look like what I'm saying or if you have other questions.

Oct 05, 2010 | 1997 Mitsubishi Eclipse

1 Answer

1986 chevy elcamino. i am having a problem with the heater blowing only cold air. i changed the thermostat but it did no good. someone told me maybe it is the blend door. how can i tell if it is and how to...

First thing you want to do is check the heater control valve on the engine side of the firewall attached to one or both of the heater hoses. Coolant must pass through it for the heater to work. If the valve is good, make sure you are getting flow through the heater core (you can run a garden hose through it) "blend door" is inside the heater box and is moved either by a small vacuum chamber (looks a lot like the vacuum advance mechanism on older chevy distributors). or it is moved by a cable. Whichever you have, it can be found on the heater box under the dashboard.
Easiest way to check them is to watch the heater box and with the engine running move the heater control Whichever type of actuator you have it should move the arm for the door when you do that. If you find one that does not work (for vacuum ones only) use a hand held vacuum pump and try to make it move. If it does, it's good if not, you either have a bad dash control or disconnected vacuum supply.
If cable type, find out why the cable isn't moving.

Sep 26, 2010 | 1986 Chevrolet El Camino

1 Answer

2004 chevy s-10 hater blows cold or lukewarm air

Well 1996 or 2004 is just a blend door to controll the temp.I see it also shows a heater core temp sensor on the 2004,but not sure if this would cause the problem.Your blend door allows air to pass over your heater core or just draw outside air.Well hope this helps.

Mar 13, 2010 | 1996 Chevrolet S-10 Pickup

1 Answer

No heat from vents with climate control. heater core is hot. fan is okay, changed out air blend motor, ac works great, infact it seeems to be on all the time?

Did you change the one behind the glove box door? If so you may have something inside the heater box keeping the door from moving completely open or closed.

Nov 07, 2009 | 1999 Ford Explorer

1 Answer

98 Jimmy Blend door cycling

I have the Heater/blend door to replace the old one in my 98 gmc jimmy. I cant get the part to slide on the shaft. Any ideas?

Mar 21, 2009 | 1998 GMC Jimmy

2 Answers

Heating system only blows out hot air through the vents

I would look at the air blend doors first, it sound like they are not working or your control in the dash is not working send a signal to them. they work by changing the air from hot to cold or in between.

Avalanche, Sierra And Silverado
  1. Remove the floor air outlet duct extension (1) from the floor duct (2). 0900c152801c9c8a.jpgRemove the floor air outlet duct extension (1) from the floor duct (2)
  2. Disconnect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  3. Remove the blend door actuator mounting screws from the HVAC module.
  4. Remove the blend door actuator as an assembly with the actuator cam. 0900c152801c9c8c.jpgRemove the blend door actuator mounting screws from the HVAC module
To install:
  1. Install the blend door actuator as an assembly with the actuator cam.
    1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
    2. Line up the A/C valve lever with the blend door actuator cam
  2. Install the blend door actuator mounting screw to the HVAC module.
    1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).
  3. Connect the electrical connection at the blend door actuator (10). 0900c152801c9c8b.jpgBlend door actuator and related components
  4. Install the floor air outlet duct extension (1) to the floor air duct (2).
C/K Series
  1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
  2. Remove the screws.
  3. Remove the adjuster links from the control lever.
  4. Remove the mode actuator.
  5. Adjust the mode actuator by completing the following steps:
    1. Connect the electrical connector to the actuator.
    2. Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
    3. Turn the ignition switch to the OFF position.
    4. Remove the actuator from the electrical connection. 0900c152801c9c8d.jpgBlend door actuator-C/K Series
To install:
  1. Install the mode actuator.
  2. Install the screws.
  3. Install the adjuster links to the control lever.
  4. Connect the electrical connector.
  5. Test the circuit operation

Nov 27, 2008 | 2001 Chevrolet Silverado

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