Ford Ranger Forum - Forums for Ford Ranger enthusiasts!

Go Back   Ford Ranger Forum - Forums for Ford Ranger enthusiasts! > >
Forgot Password? Join Us!

Welcome to Ford Ranger Forum

Reply
 
Thread Tools Search this Thread

  #1  
Old 12-13-2010, 09:16 PM
ramblinche81 ramblinche81 is offline
Learning to use the forums
 
Join Date: Dec 2010
Posts: 4
Default Different Kind of Heat AC Vent Control Problem

When I searched the GenTech forum for Heat/AC problems, the topics seem to be all or nothing...mine is slightly different.

My 2001 Ranger 4cyl has intermittent vent control problems. Selector Knob set on floor&dash vents, sometimes you get both, sometimes you get floor, sometimes you get none of the above....nothing at all.

If you choose floor only, it may or not blow on the floor. Choose upper, it may or not blow in the dash vents.

AND....maybe or not related.....

When set on floor&dash both, I can hear the AC compressor click in (and since it is 4cyl, you can even feel it a little) regardless of the heat setting.

Yes, I have hot air, scorching hot !
Yes, I have AC when on full blue cold setting despite a blown compressor seal over the summer.

Other forums indicated RPM can influence vacumn, I have not been able to pin it down to an RPM level one way or another.

So, how do I isolate the source of the problem.

If it is vacumn line related, please tell me where to conveniently ID or find the vacumn lines so I don't screw something up.

THanks for the help.

Mike
Reply With Quote
  #2  
Old 12-14-2010, 05:55 AM
rwenzing rwenzing is offline
Some assembly required...
 
Join Date: Jun 2009
Posts: 890
Default Re: Different Kind of Heat AC Vent Control Problem

You have a vacuum loss to the A/C controls. A common problem is a disconnected or cracked vacuum reservoir under the hood below the air filter housing. If that is OK, trace the two vacuum lines from the reservoir- don't disconnect and mix them up because the reservoir has a check valve that makes it directional. One vacuum line should be connected to the intake manifold of the engine, the other goes rearward to the A/C box. Look for cracked, melted, broken or disconnected lines. If all that is OK, look up under the passenger side of the dash for probelms with the vacuum lines there.

By design, the AC compressor is allowed to run in several HVAC modes. It will not run in PANEL VENT ONLY, FLOOR ONLY or OFF.
__________________
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
Reply With Quote
  #3  
Old 12-14-2010, 11:38 AM
ramblinche81 ramblinche81 is offline
Learning to use the forums
 
Join Date: Dec 2010
Posts: 4
Default Re: Different Kind of Heat AC Vent Control Problem

That is very helpful. Thanks for the details. When I get off work I will take a look.

I must say I am puzzled by the logic which runs AC compressor just because dual vents are selected but not if any single vent upper/lower is selected......I could understand for defrost mode (or defog mode really) to blow dehumidified air across the interior glass.

On a related note, I used a rental car in Baltimore last week when it was 20deg outside and while I was scraping the frost off the outside of the windshield I was letting the car warm up. Imagine my surprise when I finished scraping, sat down behind the steering wheel and looked at the controls and the little blue AC light was burning brightly since I had the controls on DEFROST mode, even though heat setting was max. lt was humorous to see the AC running and well below freezing outside. There is probably some process engineer who created logic which says, no liquid flow in heater core, and DEFROST mode selected, then default AC on. It sounds logical....except on very cold days.

Thanks again....I'll let everyone know what I found and if solved for the next owner with similar problem.
Reply With Quote
  #4  
Old 12-14-2010, 06:00 PM
ramblinche81 ramblinche81 is offline
Learning to use the forums
 
Join Date: Dec 2010
Posts: 4
Default Re: Different Kind of Heat AC Vent Control Problem

rwenzing...thanks again for the suggestions.

I started at the reservior which was fine. At first I didn't recognize it because the lines in were wrapped with what looked like plastic nomex so I thought they were wire leads rather than suction lines. Once I figured out they were poly lines instead of wire I figured out the reservior was the ball shaped item exactly where you said it would be.

From there, I traced the white, red, green poly lines and found no cracks, kinks or anyting related to the lines themselves. I found quite a few of the slip fittings loose or almost off the nipple. Most were obvious once I knew what I was looking at the connectors. They either showed too much of the slip fitting, or they were loose and easily removed from the nipple.

Two items I am curious about that are part of the vacum line system....attached to the left side of the rocker cover tucked under the air intake duct , almost in line between the reservoir and the block was a fitting which looked like it is an adjustable pressure regulator. Another similar unit on the other side of the engine between the intake manifold and the brake line manifold block. Both are capped with a round notched knob which can be turned either direction. Are they adjustable regulators ? Besides not touching or messing with them, how would you know they are set correctly ?
Reply With Quote
  #5  
Old 12-14-2010, 07:34 PM
rwenzing rwenzing is offline
Some assembly required...
 
Join Date: Jun 2009
Posts: 890
Default Re: Different Kind of Heat AC Vent Control Problem

I'm not sure what you're looking at. There is an EGR Vacuum Regulator solenoid with a round bleed filter that may look like a knob. On the driver side near the ABS Module, there is a Vapor Management Valve with a similar solenoid and filter mounted on top of a diaphragm valve. Maybe those are what you thought were regulators?

EVR:





VMV:

__________________
2003 FX4 Level II, Supercharged 5.0L V8, Headers, Duals
BW4406 manual transfer case, Aussie Locker, Torsen L/S, 4.10's
Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
Heated seats, Explorer EATC, Trip Computer and consoles

2003 XLT 2.3L M5OD-R1 reg cab, 2011 Taurus SEL, 2016 C-MAX Energi Plug-in Hybrid
Reply With Quote
  #6  
Old 12-15-2010, 10:31 AM
ramblinche81 ramblinche81 is offline
Learning to use the forums
 
Join Date: Dec 2010
Posts: 4
Default Re: Different Kind of Heat AC Vent Control Problem

Yes, those are the two items I was curious about.

The really good news is they are not adjustable regulators that can vibrate out of adjustment.

Thanks for helping me learn a little more about what is under the hood.

And overall, thanks for supporting the fourm in general. I have been out of work off and on for over three years and being able to handle the small things on my little old truck has been very helpful in saving money and keeping the truck up.

Merry Christmas and Happy New Year.
Reply With Quote
  #7  
Old 12-22-2010, 11:42 PM
PaulBennett PaulBennett is offline
Ford Truck Driver
 
Join Date: Jul 2010
Posts: 95
Default Re: Different Kind of Heat AC Vent Control Problem

Quote:
Originally Posted by ramblinche81 View Post
I must say I am puzzled by the logic which runs AC compressor just because dual vents are selected but not if any single vent upper/lower is selected......I could understand for defrost mode (or defog mode really) to blow dehumidified air across the interior glass.
You are puzzled yet you truly understand it. My Owner's Manual actually states, to wit, any knob and vent position which will allow heater air to blow on any windows including side windows will be accompanied by a/c dehumidify. Thus a/c is off only for floor heat or front vent heat.

Sounds like the results of a law suit.
Reply With Quote
  #8  
Old 02-27-2011, 12:25 AM
Joe Garfield Joe Garfield is offline
stockboy
 
Join Date: Jul 2010
Posts: 36
Default Re: Different Kind of Heat AC Vent Control Problem

Sounds like I have a similar 'problem'. My compressor clunks on and off intermittently, in what I thought was any position/setting. Sounds like it should do that? Not sure I understand what 'front vent heat' setting is, or if the temperature knob should affect the switching on and off of the compressor.

Also, any thoughts about a very loud clunk from the compressor when it turns on and off? Can hear it from outside/under the truck, and can feel it clunk through the truck.

Thanks.
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Problem with cruise control cdiehn Interior Tech 5 03-26-2011 05:18 PM
Want to Buy: AC/Heat Vent IndianScout Interior Parts 4 11-09-2010 01:25 PM
What part is this? (pic) Blower problem, this the problem? stuck on vent! Chargerondavins General Tech 2 10-02-2010 09:46 AM
2004 3.0 Vacuum problem causing a/c to go from vent to defrost on acceleration dkt 3.0 Vulcan Tech 1 04-03-2010 06:44 AM
Heater control problem Thunderstorm2_2002 General Tech 6 09-16-2009 07:15 PM