Question about 2006 Ford F-250 Super Duty

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The A/C pump starts when i move heater controls to defrost or mix

The heater works great until you move the controls to defrost or mix then the A/C pump kicks on and then it blows cold air.

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Great question dustin but the A/C is suppose to come on in defrost or mix mode- this is floor & defrost. Does not seem to make sense does it. One of the things the a/c does is remove the moisture from the air. You need warm DRY air to remove the moisture from the windows. An automotive H.V.A.C. ( Heating,Ventilation,Air conditioning) first forces air thru the a/c evaporator core then thru the heater core and out the selected vent. If you only want a/c a blend door will by-pass the heater core which is controlled by a hot/cold knob or digital temp cotrol on the dash. Now back to the cold air problem- assuming the basics are all ok- Coolant is full, Engine gets up to proper operating temp-around 195 degrees- upper radiator should be hot. Both heater hoses should be hot. If thats all OK the blend door might not be working. It is controlled by an electric motor called a Blend Door Actuator which are prone to fail. I have replaced many on ford vehicles. Hope this helps

Posted on Nov 26, 2013

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Bloomingidoi
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SOURCE: Heater only blows hot (well, warm) on full speed of fan

Replace the temp control on this car, it should be electrical control not cables.

Posted on Dec 03, 2008

jamaicanmech
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SOURCE: My 1999 Ford F150 Heater only blows out cold air

guys have you checked for a vaccum leak????? there is a little plastic ball with a vaccum line going to it that controls the outside air coming in. check for a leak in this line

Posted on Jan 08, 2009

localwonder
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SOURCE: heater is blowing but its cold air not hot air 2000 expedition

Make sure the heater core is in the open position by using the shut off valve and turning it to open. next, you may have a malfunction in the direction door the directs the air flow in the dash. a lever may have become lose or separated. may be a bad servo motor not directing the door to move to the heater position. i would start by checking that shut off valve first on the heater core.

Posted on Mar 13, 2009

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SOURCE: Air Conditioner stops blowing cold air when vehicle is not moving

plus one on the cooling fan problem. if it was low on charge then as you slow down, condensor temps and line prressures would raise therefore it would cool at low speed and and not when moving since the incoming air would drop system temp,reducing line pressure and then cusing compressor to cycle. the auxillary cooling fans must be on whenever a/c is on, if not, thats your problem. get this taken care of because if you get stuck in traffic, your engine will overheat also if fans are not running

Posted on Sep 02, 2009

johnjohn2
  • 5763 Answers

SOURCE: Heater not working. A/c working fine, move

This is a problem with these trucks, theres two things that cause this, the blend door is not working, the most common is the actuator motor that controls this door is bad and thats the clicking you are hearing, this motor is bolted to heaterbox, you will need to move heat lever to find the clicking motor as to there are a few of them that control other options, the other problem is the door breaks where the motor hooks to. that moves the door, if you remove the motor look at end where motor connects if its broke then a new door is needed, most of the time its just the actuator, heres a picture to help you find it, hope this helps.f802497.jpg

Posted on Oct 19, 2010

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How to access/replace the vent selector(defroster) ?


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Removal & Installation
  1. Remove the upper console panel.
  2. Remove the instrument cluster finish panel
  3. Release the 2 fitting claws and pull out the heater control assembly.
  4. Using a screwdriver, open the claw of the cable clamp and disconnect the defroster damper control cable. NOTE Be careful not to bend the cable wire. If the cable wire bends, the heater control assembly operationally becomes worse.
  5. Using a screwdriver, open the claw of the cable clamp and disconnect the air mix damper control cable.
  6. Disconnect the connector, remove the heater control assembly. 42050_coro_g0008.gif Removal and installation of the control panel
To install:
  1. Install the inner cable end of the air mix damper control cable to the heater control lever.
  2. Install the outer cable of the air mix damper control cable to the cable clamp. NOTE Be careful not to bend the cable wire. If the cable wire bends, the heater control assembly operationally becomes worse.
  3. Operating the heater control knob and check that it properly stops at both ends of MAX. COOL and MAX. HOT and no recoil is identified.
  4. Check that the outer cable should not be disengaged (moved) from the heater control assembly when the cable is pulled.
  5. Install the inner cable end of the defroster damper control cable to the heater control lever.
  6. Install the outer cable of the defroster damper control cable to the cable clamp.
  7. Operating the heater control knob and check that it properly stops at both ends of FACE and DEF and no recoil is identified.
  8. Check that the outer cable should not be disengaged (moved) from the heater control assembly when the cable is pulled.
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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

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I am helping change a thermostat - (we have no manual) where exactly is the thermostat located. This is a 4 cyl, standard trans, 2WD, speedo stopped working at 225K. Heater went out about 6 months ago, AC...


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If you really want to change the thermostat, please see my tip at http://www.fixya.com/cars/r5929960-s_thermostat . The thermostat is in the housing at the end of the upper radiator hose.

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Heater temperature control cables to blend door and heater water valve--adjustment:
WATER VALVE CONTROL ROD

See Figure 8
When adjusting the water valve control rod, disconnect the temperature control cable at the air mix door lever and then adjust air mix door control cable. Next, adjust the control rod. Reconnect the temperature control cable and then readjust it.
  1. Push the air mix door lever in the correct direction.
  2. Pull the control rod in the direction shown (in the accompanying illustration) until there is an 0.08 in. (2mm) clearance between the ends of the rod and link lever. Connect the rod to the door lever.
jturcotte_114.gif

TEMPERATURE CONTROL CABLE
See Figure 9
Move the temperature control lever to the cold position. Push the cable sheathing and the air mix door lever in the correct and then tighten the clamp. Verify proper operation.

jturcotte_115.gif

Nov 08, 2010 | 1992 Nissan Pickup

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The heater control knob will not turn all the way to either hot (right) or cold (left) so therefore I only get medium warm or medium cold. I assume the knob moves a cable but I cannot see it or remove the...


Cable is probably kinked or slipped adjustment. There are 2 cables connected to the knob. One move the blend door in the heater box to make the air flow thru the heater core, and the other cable opens a valve in the heater hose (engine compartment) to let the hot engine water into the heater core. Check both cables for kinks and fix and kinks. It is still doesn't work, first disconnect both cables at the blend door and valve and check the door and the valve for proper operation (can you open and close them by hand?--if not, these must be repaired or replaced), then, if good, adjust the cables according to this procedure from autozone.com:


CONTROL CABLE Adjustment

  1. Under the hood, open the clamp and disconnect the heater control valve cable from the arm.
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Since warm air eventually comes out when the vehicle is in motion, you may have an air mix door that is stuck in fresh or is somehow blocking warm air from the heater core.

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1. Turn the ignition switch ON (II).
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