air wont blow out of vents .. only defroster - Ranger-Forums - The Ultimate Ford Ranger Resource


General Technical & Electrical General technical and electrical discussion for the Ford Ranger that does not fit in any other sub-forum.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 06-22-2005
Member
Thread Starter
 
Join Date: May 2005
Location: Paoli,IN
Posts: 63
air wont blow out of vents .. only defroster

air wont blow out of vents .. only defroster, what could the problem be? how hard would it be to fix?
Reply With Quote
  #2  
Old 06-22-2005
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,831
Defrost only is the default position when the HVAC loses its vacuum source from the engine. Follow the plastic vacuum line from the HVAC box (under the hood on the passenger side firewall) back to the engine to see if its cut, melted or unplugged. Also check the spherical plastic vacuum reservoir under the air filter box for damage.
Reply With Quote
  #3  
Old 06-22-2005
loneFX4's Avatar
Member
 
Join Date: Jan 2005
Location: Summerville,SC
Posts: 955
might have something to do with vacuum lines. im not sure if your hvac uses them but that would be something to check. it is a default safety mechanism that if something like that would happen then the air is routed automatically to the defrost to keep the driver safe or sumthing of that sort.

check behind the unit itself. beyond that i dont know.

man bob, beat me to the explanation.
Reply With Quote
  #4  
Old 06-22-2005
Member
Thread Starter
 
Join Date: May 2005
Location: Paoli,IN
Posts: 63
by chance do you have a pic of the hvac box?
Reply With Quote
  #5  
Old 06-22-2005
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,831
Quote:
Originally Posted by wdstone
by chance do you have a pic of the hvac box?
You can't miss it. It's the big black box under the hood on the passenger side firewall. Look for a plastic vacuum line coming out of it. The vacuum line could have easily been disconnected while working under the hood.
Reply With Quote
  #6  
Old 06-22-2005
FoMoCoFiddy's Avatar
Member
 
Join Date: May 2004
Location: Smackdownville Tx
Posts: 4,508
Mine did that when coy destroyed my spherical plastic vacuum reservoir, it sucks. Lost the vac in the lines.
Reply With Quote
  #7  
Old 06-22-2005
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,831
Quote:
Originally Posted by FoMoCoEdge
Mine did that when coy destroyed my spherical plastic vacuum reservoir, it sucks. Lost the vac in the lines.
For some reason, my thoughts keep coming back to the "2001 front end conversion" in his signature.....
Reply With Quote
  #8  
Old 06-22-2005
Member
Thread Starter
 
Join Date: May 2005
Location: Paoli,IN
Posts: 63
it wasnt working before the front end conversino.. i looked real quick but everything look connected as far as i could tell, im going to go more in depth tomorrow
Reply With Quote
  #9  
Old 06-22-2005
rngprerunner's Avatar
Member
 
Join Date: Jun 2004
Location: Long Beach CA
Posts: 3,453
Mine went out once and it ended up being a vacume plug that goes to the resivour ball.. might check that, its behind the bumper under the passanger head light
Reply With Quote
  #10  
Old 06-22-2005
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,831
Crawl under the dash and see if any of the vacuum hoses are disconnected from the vacuum servos - I think there are 3 servos. There is also a multicolored vacuum harness that plugs between the underdash plenum and dash control panel. Having a leak under there might do the same thing.

Quote:
Originally Posted by rngprerunner
Mine went out once and it ended up being a vacume plug that goes to the resivour ball.. might check that, its behind the bumper under the passanger head light
I remember that!
Reply With Quote
  #11  
Old 06-23-2005
Rand's Avatar
Member
 
Join Date: Jun 2004
Location: Barberton,Ohio
Posts: 1,189
Mine was the vacuum line the dumbass firestone tech hid because I caught him changing 5 plugs not 6 :)

ITS DEFINITELY vacuum related..
I do need to see another ranger to see wtf the routing on this line is though..
I know its not where I have it now...
Rand
Reply With Quote
  #12  
Old 06-23-2005
2003stealthedge's Avatar
Member
 
Join Date: May 2005
Location: The ILL State
Posts: 1,297
i found this problem in th emustang 2day i dunno if its the same but on the 5.0 its on the top passenger side and ttheres 2 lines coming out of it
Reply With Quote
  #13  
Old 06-29-2005
Member
 
Join Date: May 2005
Location: Hampton NH
Posts: 54
While we are on the topic - the relay near the unit on the firewall clicks and my a/c compressor keeps cycling the compressor clutch about every 45 seconds. this seems to happen even when I have the thing on fresh air only. Got any ideas?
Reply With Quote
  #14  
Old 06-29-2005
ScottG's Avatar
Member
 
Join Date: May 2004
Location: Lewiston, Maine
Posts: 4,926
i have a similar problem with my air, only while on MAX AC it will off and on switch the the defroster and then the front vents... Does happen on Regular AC though
Reply With Quote
  #15  
Old 06-29-2005
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,831
Quote:
Originally Posted by kimmer415
While we are on the topic - the relay near the unit on the firewall clicks and my a/c compressor keeps cycling the compressor clutch about every 45 seconds. this seems to happen even when I have the thing on fresh air only. Got any ideas?
That is tha AC Cycling Switch and it's purpose is to cycle the compressor off to prevent the evaporator coil from freezing up. When the possibility of freezing is gone, the compressor cycles on again. It is doing its job.

The frequency of cycling is dependent on several variables like interior temp, ambient temp, engine RPM and the amount of refrigerant in the system. A system that cycles on for just a couple of seconds at a time is probably very low on refrigerant.

You don't give any indication about what you're driving. If it is a late model Ranger, your compressor clutch should not engage when the mode selector is in the Off, Vent Only or Floor Only positions. The compressor clutch can be engaged by PCM control in any of the other 5 positions.
Reply With Quote
  #16  
Old 06-29-2005
Member
 
Join Date: May 2005
Location: Hampton NH
Posts: 54
Sorry for the limited details:
1999 3.0 Auto 4X4 80k miles
I am kinda familiar with the system cycling but this is way to often
Going to have refrigerant checked/filled tomorrow. ANyone do this himself
or is it less hastle going to a grudge?
Reply With Quote
  #17  
Old 06-29-2005
V8 Level II's Avatar
RF Veteran
iTrader: (4)
 
Join Date: Nov 2004
Location: Michigan
Posts: 7,831
Quote:
Originally Posted by kimmer415
Sorry for the limited details:
1999 3.0 Auto 4X4 80k miles
I am kinda familiar with the system cycling but this is way to often
Going to have refrigerant checked/filled tomorrow. ANyone do this himself
or is it less hastle going to a grudge?
45 seconds is not too often for R134a. If it comes to it, you can recharge it yourself with a kit. But that would be a waste because it is leaking. Eventually, you will end up getting it repaired, evacuated and recharged anyway.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Air only blows through top dash vents... Deftsound General Technical & Electrical 51 07-12-2017 06:45 PM
air only blows out the dash defroster lmilhorn SOHC - 2.3L & 2.5L Lima Engines 12 07-17-2015 03:33 PM
Defroster Vents Only & Postions 1 & 2 arnt working Kris03 General Technical & Electrical 5 06-23-2012 12:29 AM
2002 Ranger; A/C & Heat Blows Air Thru Defrost Vents Only vsromero General Technical & Electrical 6 05-30-2012 04:36 AM
ac only blowing out the defroster .. bad FUSE? wdstone General Technical & Electrical 23 07-11-2005 03:45 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 06:33 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.