2000 Dodge Ram heater/defroster air direction selector

Tiny
OLEFRANK
  • MEMBER
  • 2000 DODGE RAM
  • 6 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
My heater works, making hot air, and my air conditioner works making cold air. The fan works at all speeds. However, I can't change where the air comes out at, no matter where I switch the knob to. I would guess that the switch is bad however I don't want to just throw parts at the truck. I really like my Dodge and want it to work. Could you help me?
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Sunday, May 17th, 2015 AT 11:56 AM

32 Replies

Tiny
SATURNTECH9
  • EXPERT
Can you hear any clicking noise when changing the different air positions? It could be a bad mode door actuator let me know about the clicking noise and we will go from there.
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Sunday, May 17th, 2015 AT 12:00 PM
Tiny
OLEFRANK
  • MEMBER
I can hear no clicking.
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Sunday, May 17th, 2015 AT 12:04 PM
Tiny
SATURNTECH9
  • EXPERT
Do have a manual ac or auto climate control?
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Sunday, May 17th, 2015 AT 6:35 PM
Tiny
OLEFRANK
  • MEMBER
It's manual. There's a knob you turn. Top knob is where the air goes (def, floor, to occupants, both, etc), middle knob is fan power, bottom knob is how hot or cold.
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Monday, May 18th, 2015 AT 7:17 AM
Tiny
SATURNTECH9
  • EXPERT
Looks like the positioning of the air outlet is ran by vacuum and has more then one vacuum actuator. Can you hear any hissing with the truck running if you put the air flow in different ways positions while listening under the dash?
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Monday, May 18th, 2015 AT 7:57 PM
Tiny
SATURNTECH9
  • EXPERT
Also the solid black vacuum line to the air flow positioning knob should have vacuum to it with the truck running.
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Monday, May 18th, 2015 AT 8:14 PM
Tiny
OLEFRANK
  • MEMBER
I'll look/listen tomorrow. Is there a vacuum line going to the switch? Or where are they/it? Where do they come from under the hood. Maybe, if it's a lack of vacuum, I could follow the line/s and see if there's something worn, crimped, or broken.
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Monday, May 18th, 2015 AT 8:37 PM
Tiny
OLEFRANK
  • MEMBER
And I'll look at this too, tomorrow.
Thanks,
Frank
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Monday, May 18th, 2015 AT 8:38 PM
Tiny
SATURNTECH9
  • EXPERT
You're welcome.
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Monday, May 18th, 2015 AT 9:41 PM
Tiny
OLEFRANK
  • MEMBER
OK. I'm back. I listened and could hear nothing as far as air goes. I even took the dash apart and unscrewed the control box. Looking behind it everything appeared to be hooked up and like new. I switched from one position to another and noted that something changed slightly. It appeared to be the amount of air being forced through a channel - not vacuum but exhaust from the fan. As if it were being deflected in another direction. While less air appeared to come from the defroster vent, nothing came out of the front vents. Does this help with your diagnosis?
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Tuesday, May 19th, 2015 AT 4:27 PM
Tiny
OLEFRANK
  • MEMBER
Can you tell me where the vacuum pump is on my diesel? If I know that I can check the hose to see if it has a break/leak/bend in it.
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Tuesday, May 19th, 2015 AT 5:20 PM
Tiny
SATURNTECH9
  • EXPERT
It sounds like the mode door is binding up that be in the center behind the dash see if that is moving smoothly. As far as a vacuum pump those are mainly used for power brake boosters. Do you have hydro boost for the power brakes or is it vacuum?
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Tuesday, May 19th, 2015 AT 5:52 PM
Tiny
OLEFRANK
  • MEMBER
I have no idea.
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Tuesday, May 19th, 2015 AT 7:10 PM
Tiny
OLEFRANK
  • MEMBER
Where do you get to the door? From the inside, under the dash? Can I reach it without disassembling a lot?
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Tuesday, May 19th, 2015 AT 7:12 PM
Tiny
SATURNTECH9
  • EXPERT
You should be able to get to it under the dash inside there may be a plastic panel you may have to remove.I would try from the passenger side. Take a picture of your master cylinder and post it.
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Tuesday, May 19th, 2015 AT 9:17 PM
Tiny
OLEFRANK
  • MEMBER
On the passenger side, under the dash, all is enclosed in a number of black plastic containers that don't have any indication on how to open them. I did see, however, one small flat, round item with wires coming from it that looked like it could be a controller of some kind. It appeared to be something that I could remove from its base.

I hope you get the pictures I have taken.
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Wednesday, May 20th, 2015 AT 10:18 AM
Tiny
OLEFRANK
  • MEMBER
From another angle
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Wednesday, May 20th, 2015 AT 10:18 AM
Tiny
OLEFRANK
  • MEMBER
First pic larger
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Wednesday, May 20th, 2015 AT 10:19 AM
Tiny
SATURNTECH9
  • EXPERT
Thats hydro boost meaning the power brakes a are powered by the power steering pump sending pressure to the power brake unit. No vacuum needed.
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Wednesday, May 20th, 2015 AT 3:51 PM
Tiny
OLEFRANK
  • MEMBER
I have found another website while waiting for answers from you. In it it discusses a "blend door" problem that happens to Dodge trucks of my year. It also shows a fix. Would you tell me if this could be the problem and the solution. Please look at heatertreater. Net and look at the 98-02 Dodge Ram. The video shows what I believe to be the piece under the dash on the heater component covers.
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Wednesday, May 20th, 2015 AT 4:10 PM

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