Question about 1998 Ford Ranger SuperCab

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All air comes out of the defroster

Just put in new air/heat controls. Believe it is problem with vacuum hose going into motor from under dash. How hard is it to pull dash?

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I had almost the same problem. All air came out defrost and heat vents. Found that vacuum line under hood was not connected to the intake hose near the mass air flow sensor. Also a line that "T"ed off the line mentioned above was broken. A very simple fix.

Posted on Jan 31, 2009

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Are you sure its vacume? or is it electronic.

Posted on Jan 23, 2009

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2 Answers

No air blows out the dash vents hot or cold


if all your air or heat comes out of your defrost than the problem is more than likely your switch or a vacuum hose to the switch. Car's default to defrost when there is a problem. I can't recall off the top of my head but I do believe that vacuum controls the blend doors on the 98 Ranger. I can't quite remember but I think the white one is the main vacuum. Either way. pull out your heater switches, disconnect the rubbery plug with all the vacuum hoses, start the engine....1 of those should have constant vacuum, if not...chase it.....there will be 1 that goes through the firewall to the engine, the rest go to the blend doors.

Mar 29, 2015 | 1998 Ford Ranger

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Air will not come out of a/c vents


Your controls are vacuum operated. Make sure that there is vacuum present...if not find the disconnect. Or, the vacuum "motor" that controls air direction has failed or is stuck.

Jun 18, 2009 | 2001 Jeep Cherokee

1 Answer

1987 monte carlo heater control blows out everwhere


The vacuum motor is located under the dash in a most inaccesable location. Will be located above the air ducts about center dash. Follow the heater control vacuum hoses to the motor unit. Remember that it is connected by linkage to an air duct.

Apr 03, 2013 | Chevrolet Monte Carlo Cars & Trucks

2 Answers

Trying to figure out what exactly is wrong with my 2002 dodge intrepid. Blows air but only on defrost and the switch to make it go doesn't work


  • The first thing is to check the vacuum lines in the engine bay and coming off the HVAC. Your system is vacuum controlled. It sounds like a hose either rotted and split or you might get away with one having come off.
  • Check the hoses real well in the engine bay running to the HVAC. Which will be the blower motor area.
  • Do you hear the actuator moving when you switch the temp/heat to AC?


  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.


Regards,Tony

Oct 07, 2011 | 2002 Dodge Intrepid

1 Answer

Where is the windshield washer motor located? Is it near the heater motor? I had mine fixed and now the heat comes out of the dash for the defroster


Windshield Washer Pump Removal & Installation To Remove:
  1. Remove the air cleaner assembly.
  2. Remove the bolts. windwash.gif

  3. Position the pump and reservoir aside.
  4. Disconnect the electrical connectors.
  5. Disconnect the washer hose.
  6. Remove the pump and reservoir.
  7. Remove the washer pump.
washpump.gif

WARNING
Windshield washer solution contains methanol which is poisonous. Observe all cautions and warnings indicated on label of washer solution container.
NOTE: Windshield washer fluid should be collected in a container after the windshield washer hose is disconnected.
To Install:
WARNING
Windshield washer solution contains methanol which is poisonous. Observe all cautions and warnings indicated on label of washer solution container.
  1. Install washer pump in reservoir.
  2. Install washer pump reservoir assembly.
  3. Connect washer hose.
  4. Connect washer electrical connector.
  5. Install air cleaner assembly.
---
The windshield wiper fluid pump is located in the tank which is not in the heater motor or defroster area in the dash.

The defroster/heat control door is located in the dash board area:

Air Door Actuators, Cables or Motors Removal & Installation Air Inlet Door Vacuum Control Motor To Remove:
  1. Remove the instrument panel lower insulator cover.
  2. Disconnect the vacuum connector.
  3. Remove the control arm clip and the spring.
  4. Remove the nuts and the air inlet door vacuum control motor.
Air inlet door vacuum motor mounting screws for-10-00-245.gif

To Install:
  1. Install the vacuum motor on the mounting bracket.
  2. Connect the control arm and spring.
  3. Connect the vacuum hose to the vacuum motor.
  4. Install the lower instrument panel lower cover.
Floor Defrost Door Vacuum Control Motor To Remove:
  1. Disconnect the negative battery cable.
  2. Remove the left lower dash insulator panel and disconnect the lamp.
  3. Remove the two pin-type retainers and remove the fill panel.
  4. Remove the DLC mounting screws.
  5. Detach the vacuum line.
  6. Remove the lighting module.
  7. Remove the screws and the bracket.
  8. Remove the floor/defrost door vacuum control motor.
Floor/Defrost vacuum motor mounting screws for-10-00-246.gif

To Install:
  1. Connect the vacuum lines and install the floor/defrost vacuum motor.
  2. Install the bracket and lighting control module.
  3. Install the DLC bracket and mounting screws.
  4. Install the fill panel.
  5. Install the left lower dash insulator panel.
  6. Connect the negative battery cable.
Panel Door Vacuum Control Motor To Remove:
  1. Remove the instrument panel.
  2. Reach through the door opening and remove the pin.
  3. Disconnect the panel door vacuum control motor vacuum line.
  4. Remove the screws and remove the panel door vacuum control motor.
To Install:
  1. Install the panel door vacuum motor.
  2. Connect the vacuum line to the panel door motor.
  3. Reach through the opening and install the pin to the linkage.
  4. Install the instrument panel.
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Jan 19, 2011 | 2003 Mercury Grand Marquis

3 Answers

2001 Windstar- I have no heat or defrost. I do


I had this problem and noticed a faint clunking sound behind the radio. It was the blend door motor that needed to be replaced. The motor has small fine tooth plastic gears that wear out and won't open to allow heat.

Nov 07, 2009 | 2001 Ford Windstar

4 Answers

Heating / air conditioning control stuck to front defrost vents


There is a vacuum leak under the hood. Find the vacuum line on the passenger side where it comes through the firewall and follow it to the engine. You system needs vacuum to operate and without it the default setting is on defrost for safety reasons.

Jun 19, 2009 | 1999 Dodge Durango

4 Answers

Climate controls


Car manufacturers use the defrost mode as a default for safety reasons. Being they want you to be able to defrost the windshield no matter what. So when something goes wrong the system automatically goes to the defrost mode. You most likely don't have the vacuum hose connected under the dash at the climate control assy. Or if this vehicle doesn't use the vacuum hose style you may have not plugged in one of the connectors under the dash or behind the climate control assy. Good luck.

May 21, 2009 | 1997 Lincoln Continental

1 Answer

My name is bob michalski,and i have just replaced a heater core in my buddy's 1991 buick century,we have heat,i just can't find what's wrong with the defroster's there's very little heat coming from the...


a kink in the hose will cause poor water flow so it will be slow to heat and may cause the heat not to be as hot, as for the defrost, check the operation of all diverter doors, should be vacuum controlled, you may have a vacuum leak under dash or missing hose

Apr 07, 2009 | 1991 Buick Century

1 Answer

Defrost will not work


The switch that does this is the mode control, You will need to pull the heater control out and check that it is sending a vacuum signal to the defrost air diversion door vacuum motor, if it is then the hose is either restricted or the vacuum motor is bad or more likely something has fallen down into the dash and jammed the defrost door, this is the most common problem I saw as a Ford dealer tech for 20 years. The usual item found is a pen or pencil.

Nov 21, 2008 | 1996 Ford Taurus

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