Question about 2004 Pontiac Grand Am

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No heat. How do I check the blend actuator for proper function?

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  • Expert
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Fold down the glove box to observe the movement of the blend door when you switch between A/C & heat.

Posted on Nov 09, 2014

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Might not be as straight forward as that , does the engine coolant system has the correct level of coolant ? does the engine heat up to the correct operating temperature ?if both of these ok and the rad cooling fan cuts in then the heater controls or the heater matrix are the likely problem area's , try bleeding the coolant system as may have an air lock stopping the heater matrix getting hot , open and shut the heater temp from hot to cold while doing this a few times to get the coolant into the matrix , let me know how you get on .

Posted on Nov 09, 2014

  • Don Boal
    Don Boal Nov 12, 2014

    I'm having the same no heat problem. Where is the bled valve located to bleed any trapped air from getting to the matrix?

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1 Answer

Heat and air conditioning temperature control does not work. Why doesn't ac blow cold air even though compressor runs and the refrigerant line gets cold? Only hot air comes from vents.


Probably the air blend door is not functioning properly. This can be caused by a vacuum leak; bad actuator; or bad vacuum check valve.

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heater core might need replaced . check the hoses going to it under the hood after it gets to operating temperature .One should be hot and the other not so much

Nov 19, 2015 | Ford Cars & Trucks

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1998 Dodge Stratus - Air conditioning is blowing through the defrost vents


Vacuum controls this circuit and leaks will cause blend air door to default to defrost. Check for bad check valve or hose leaks under hood first as these are the easy ones to get at and under hood heat causes deterioration.

Jul 08, 2015 | 1998 Dodge Stratus

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NO HEAT THE CORE IS NOT PLUGED UP WITH ANY JUNK JUST NOT CIRCULATING


Make sure your coolant level is correct - turn the engine on, turn the defrost, heat, and blower on high, open the coolant cap and rev the engine up for a little bit. Do this at a cold start. Check the level while doing this and make sure it is full. Another possibility is the blend doors are not functioning properly. Make sure the actuators are not binding up that control the blending.

Mar 15, 2011 | 2003 Dodge Durango

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Heater blows cold air


Hi!
If the Temp. Selector Control is set to Heat and blows cold air, your Blend Door Actuator may be stuck or it is inoperative. The actuator is not fixable, if it fails, it must be replaced. Follow the instructions to remove and replace it.
  1. Disconnect battery negative cable from battery and properly isolate to prevent accidental reconnection.
  2. Remove the instrument panel.
  3. Disconnect the electrical connector from the blend door motor/actuator.
  4. Remove the four screws holding the blend door actuator to the plenum.
  5. Remove the temperature blend door actuator.
BLEND DOOR ACTUATOR CONNECTOR e8349ea.jpg

BLEND DOOR FASTENING SCREWS 9744710.jpg

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Oct 07, 2010 | 2003 Mercury Grand Marquis

1 Answer

My heater will only blow hot air out of the rear vents from the rear controls. The front vents only blow cold air. Is there a simple fix?


blend door or temp contrl switch is bad.

Section 12-02: Heating and Defrosting 1998 Windstar Workshop Manual
REMOVAL AND INSTALLATION Actuator Motors, Electric Temperature Blend Door
Removal
  1. Remove cassette storage box or center shelf unit, if equipped.
  1. Remove instrument panel ash receptacle (04810) by depressing service lever.
  1. Disconnect electrical harness connector from electric blend door actuator.


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  1. Remove three retaining screws.


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  1. Carefully pull electric blend door actuator outward and off A/C evaporator housing (19850) assembly.
Installation
  1. Follow removal procedure in reverse order.
  1. Air temperature control door shaft is keyed. Move door to properly insert electronic actuator shaft. Make sure the shaft is completely in and properly seated.

Jan 14, 2010 | Ford Windstar Cars & Trucks

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Heater not working properly, doesn't get as warm as it should, fan is working, appears that the control that regulates the flow of air is not working properly


sound like a vacuum leak. you can check this by spraying wd40 very carefilly on the vacuum lines under the hood. the idle will change when a leak is detected. could also be a modulator valve or vacuum line under the dash. check this with a spray bottle filled with water. dont want the smell of wd40 in the cabin

Jan 02, 2010 | 2001 Ford Taurus

2 Answers

1999 Silverado - cannot get the temperature to switch from cool air to warm air when turning the knob to heat.


The temp blend door, or blend door actuator may be faulty. You can check this by watching the movement of the blend door actuator while you turn the temp selector knob. If the actuator is working, then it may be the blend door, or blend door lever broken. If these are ok then the control head may be faulty.

Oct 18, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

No heat Heater core is hot


If heater core is getting coolant circulating through it then you may have a temp blend door, or blend door actuator not working properly. The blend door is located in the air box under the dash, and the actuator is located on the air box. You may be able to visually check the operation while turning the temp knob, by locating the coresponding actuator on the air box and monitoring the movement. If it is moving ok and still no heat then the blend door, or lever is broken, which will require removal of the dash.

Oct 17, 2009 | 2001 Dodge Ram 2500 Truck

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