Question about 1997 Honda Passport

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Heater control will not turn on defrost. Appears out of adjustment. Control will also not go all the way to the left for Max AC

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Look under the glove box, there should be a plastic tube covering a cable running from the head unit (heater control) to a lever... cycle the heat temp...
the plastic cable more than likely has broken free from the retaining clip and not allowing the blend doors to move. hold the plastic tube in place and move the temp controls, if the doors then work you need a new retainer for the cable,

Posted on Oct 07, 2009

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Posted on Jan 02, 2017

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1 Answer

1999 durango vent control switch will not let AC blow threw vents only defrost


Usually this is a problem with the blend doors under the dash. You either have a vac leak, a dead motor, or a faulty door.
The control opens and closes the doors to direct air thru the heater core and evaporator core along with directing air thru the vents.
When a problem occurs, the default position is the defrost vents to make sure the windshield remains clear.
You can do an internet search for "repair durango blend door" for more info.

Jul 29, 2012 | 1999 Dodge Durango

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Ac system goes to the defrost vent when on max ac or regular ac sometimes moves to floor area


Heater ducting is designed to fail in defrost mode. Look for lose or leaking vacuum hoses. The you investigate the controls, then the heater / A/C box...

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If my fan turns on as soon as i turn the key is it a coolant sensor


if you left the heater control in defrost or ac control on,,one will come on,, or if engine is hot

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I have a mercury mountaineer 2003 V6. It has a problem of making sound repeated when I want to have heat turned on. No sound when the dashboard A.C/Heat stays at AC level, which is the zero? level. The...


When the engine is cold,check the coolant level.

Make sure it's on max.

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A coolant system should be flush every two years.

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If you did a coolant flush recently then air pocket can be the cause of the un-even heating problem.

The DIY method is to drive you car onto a ramp or a steep hill.

Iet the engine cool off and top off the coolant tank.

Set MAX heat + MAX fan

Let the engine ran for 20 minutes wih the cap off and the trap air will escape from the coolant reserve tank,

Check coolant level and top off coolant when the engine cools down.



A shop will charge $75+ for this but using an air operated excavate tool!

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A car with over 90K miles may experience linkage problem to the heater control valve.

The heater control valve (near the firewall) may be stick over time.

Open the hood and move the heater to max and min. Back and forth.

Clean and lube the linkage with WD-40 to free the heater control valve.

If it's a vacuum type heater control valve then cash for leaky vac. hoses.


=======
Move the fan switch back and forth to re-new the electrical conductors.

Pass a vacuum over the control panel to prevent dust build up behind the console.

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1 Answer

1997 explorer max ac switches between front and defroster vents


Check the vacuum hose going to the heater control valve,it may have popped off. If that is on. check the vacuum hose going to your recirculation door under the right side of your dash. I hope this helps.

Jun 09, 2009 | 1997 Ford Explorer AWD

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Air Condition acting wierd - 1997 Ford Explorer


Below, I've pasted instructions for the Control Cable adjustment.

Function Selector And Temperature Selector Control Cable To check the temperature cable adjustment, move the temperature control lever all the way to the left, then move it all the way to the right. At the extreme ends of lever travel, the door should be heard to firmly seat, indicated by a loud thumping sound, allowing either maximum or no air flow through the heater core. To check the function cable adjustment, see that the function lever will reach the detents at the far left and right of its travel. In addition, check that the air flow is correct when the function lever is moved through each detent provided in the control assembly. If cable adjustment is needed, proceed as follows:
  1. Disengage the glove compartment door by squeezing its sides together. Allow the door to hang free.
  2. Working through the glove compartment opening, remove the cable jacket from the metal attaching clip on the top of the plenum by depressing the clip tab and pulling the cable out of the clip.
The adjustable end should remain attached to the door cams.
  1. To adjust the temperature control cable, set the temperature lever at COOL and hold. With the cable end attached to the temperature door cam, push gently on the cable jacket to seat the blend door. Push until resistance is felt. Reinstall the cable to the clip by pushing the cable jacket into the clip from the top until it snaps in.
  2. To adjust the function control cable, set the function selector lever in the DEFROST detent and hold. With the cable end attached to the function cam, pull on the cam jacket until cam travel stops. Reinstall the cable to the clip by pushing the cable jacket into the clip from the top until it snaps in place.
  3. Install the glove compartment.
  4. Run the system blower on HIGH and actuate the levers, checking for proper adjustment.
Should the Control Cable turn out fine, then it's most likely to be the Blower Motor Resistor. It's a common Ford issue where some fan speeds fail in Ford's climate control but others work. In your case, it appears the lower speed is failing.
An illustration of the Blower Motor Resistor is linked to below.
Removal & Installation
  1. Disconnect the negative battery cable.
  2. Disconnect the wire connector from the resistor assembly.
  3. Remove the 2 screws attaching the resistor assembly to the blower or evaporator case and remove the resistor.
  4. Installation is the reverse of the removal procedure. Check the blower motor for proper operation in all blower speeds.
Best of luck with your problem!
Greg

http://www.chiltonlibrary.com/content/images/8555/images/85556005.pdf

May 17, 2009 | 1997 Ford Explorer AWD

1 Answer

No heat - ac stays on blowing through defrost vents


If you have the heater directed to the windshield, the AC will turn on. Move the control away from defrost.

Feb 01, 2009 | 1998 Ford Windstar

1 Answer

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.

Jan 18, 2009 | 1997 Chevrolet K1500

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