Go Back   F150online Forums > Body > HVAC
Sign in using an external account
Register Forgot Password?

Reply
 
 
 
 
Thread Tools Search this Thread Display Modes
  #1  
Old 03-16-2007, 03:40 PM
Senior Member
 
Join Date: Dec 1969
Location: TUCSON,AZ,USA
Vehicle: 1997 Ford F150
Posts: 996
Question Which Port to Recharge 134A?

New to playing with A/C systems. Which port do I hook up my can of 134A with a guage to check the A/C system?

I found a black cap on an A/C line on the passenger side and toward the front of the engine (is this the correct place)?

There also appears to be a port on the tin can looking thing up by the firewall.

Any help wld be appreciated.

97 F-150 XLT with 4.6 V8
__________________
97 F150, 2WD, Reg Cab,Flareside,Dk Toreador Red, Windsor 4.6, Live Wires & Coil Packs, Underdrive Pulleys, Troyer Performance Dual 16" Electric Fan Kit, 3.55 LS, EGR Bug Deflector, Retrax Bed Cover, BedRug, XL Full Length Running Boards,EGR Fender Flares, Air Aid Kit, Gibson Single Out Cat Back, Superchips, Hellwig Rear Sway Bar, Hellwig 2500# Overload Springs,Energy Suspension Polyurethane Sway Bar Bushings, 265 70 16 tires, Rancho RS9000 shocks,Expedition Center Console
Reply With Quote
  #2  
Old 03-16-2007, 05:04 PM
Senior Member
 
Join Date: Oct 2002
Location: St. Louis (Out in the woods)
Vehicle: 2001 Ford F250 6.8
Posts: 5,224
Quote:
Originally Posted by T Ellenberger
....



There also appears to be a port on the tin can looking thing up by the firewall.

....

That one. The other is the high side port that your adapter wouldn't fit anyway.

Take a static reading first to see if you even need a recharge. You need a minimum of 45 psi at your ambient temperature in order to "make" the cycling pressure switch and enable compressor clutch engagement.

Steve
Reply With Quote
  #3  
Old 03-16-2007, 11:53 PM
Senior Member
 
Join Date: Nov 2006
Location: Memphis, TN 38135, USA, Earth
Vehicle: 1983 Ford Bronco
Posts: 5,334
The first one should be helpful - the 2nd might be too technical, and probably not useful for you anyway.

.
__________________
Walk softly & carry a BIG SIX ! ! !

. . .
Reply With Quote
  #4  
Old 03-17-2007, 11:51 AM
Senior Member
 
Join Date: Dec 1969
Location: TUCSON,AZ,USA
Vehicle: 1997 Ford F150
Posts: 996
Thanks guys. I will be out in the garage playing around tody.
__________________
97 F150, 2WD, Reg Cab,Flareside,Dk Toreador Red, Windsor 4.6, Live Wires & Coil Packs, Underdrive Pulleys, Troyer Performance Dual 16" Electric Fan Kit, 3.55 LS, EGR Bug Deflector, Retrax Bed Cover, BedRug, XL Full Length Running Boards,EGR Fender Flares, Air Aid Kit, Gibson Single Out Cat Back, Superchips, Hellwig Rear Sway Bar, Hellwig 2500# Overload Springs,Energy Suspension Polyurethane Sway Bar Bushings, 265 70 16 tires, Rancho RS9000 shocks,Expedition Center Console
Reply With Quote
  #5  
Old 03-18-2007, 12:58 PM
Senior Member
 
Join Date: Dec 1969
Location: TUCSON,AZ,USA
Vehicle: 1997 Ford F150
Posts: 996
Thanks again. Over 10 years of service on my 97 and the 134A level was up to where it should be. I love to tinker with things so I felt I just had to know which port to check.
__________________
97 F150, 2WD, Reg Cab,Flareside,Dk Toreador Red, Windsor 4.6, Live Wires & Coil Packs, Underdrive Pulleys, Troyer Performance Dual 16" Electric Fan Kit, 3.55 LS, EGR Bug Deflector, Retrax Bed Cover, BedRug, XL Full Length Running Boards,EGR Fender Flares, Air Aid Kit, Gibson Single Out Cat Back, Superchips, Hellwig Rear Sway Bar, Hellwig 2500# Overload Springs,Energy Suspension Polyurethane Sway Bar Bushings, 265 70 16 tires, Rancho RS9000 shocks,Expedition Center Console
Reply With Quote
  #6  
Old 06-18-2007, 10:16 PM
Junior Member
 
Join Date: Oct 2006
Location: Mesa, AZ
Vehicle: 2001 Ford F150
Posts: 18
Quote:
Originally Posted by projectSHO89
That one. The other is the high side port that your adapter wouldn't fit anyway.

Take a static reading first to see if you even need a recharge. You need a minimum of 45 psi at your ambient temperature in order to "make" the cycling pressure switch and enable compressor clutch engagement.

Steve

Hey I just checked mine and it is right at 45-46, but my guage says that is full and not to add anymore, what do you think? Am I ok, should I add more, I don't want to overfill it by any means
Reply With Quote
  #7  
Old 06-18-2007, 11:43 PM
Senior Member
 
Join Date: Oct 2002
Location: St. Louis (Out in the woods)
Vehicle: 2001 Ford F250 6.8
Posts: 5,224
Quote:
Originally Posted by tayloraz
Hey I just checked mine and it is right at 45-46, but my guage says that is full and not to add anymore, what do you think? Am I ok, should I add more, I don't want to overfill it by any means

Sounds like you have a POS low-side only guage.... It's like trying to listen to stereo music while being deaf in one ear.

Static pressure with 90F ambient underhood temp should be around 100-110 psi, not 45 or so.

You are substantially undercharged.

The low side guage reading is for while the compressor is operating...and it's still like being deaf in one ear since you will have no idea when the proper chrage lelvel is reached.

Steve

Last edited by projectSHO89; 06-18-2007 at 11:49 PM.
Reply With Quote
  #8  
Old 06-20-2007, 01:08 PM
Junior Member
 
Join Date: Oct 2006
Location: Mesa, AZ
Vehicle: 2001 Ford F150
Posts: 18
Quote:
Originally Posted by projectSHO89
Sounds like you have a POS low-side only guage.... It's like trying to listen to stereo music while being deaf in one ear.

Static pressure with 90F ambient underhood temp should be around 100-110 psi, not 45 or so.

You are substantially undercharged.

The low side guage reading is for while the compressor is operating...and it's still like being deaf in one ear since you will have no idea when the proper chrage lelvel is reached.

Steve

Thanks Steve, but I have a question, Since all I have is the low side guage, and it read 45-46 when the engine was on and the AC was on the max setting how much more do you recommend that I add? What PSI should I fill it to on my low side guage?
Reply With Quote
  #9  
Old 06-20-2007, 01:54 PM
Senior Member
 
Join Date: Oct 2002
Location: St. Louis (Out in the woods)
Vehicle: 2001 Ford F250 6.8
Posts: 5,224
You cannot accurately charge a system with only a low-side gauge. I thought I made that clear. I cannot make ANY recommendation as to how much you need based solely on your single reading.

However, if you are reading the same value whether the A/C compressor is running or not and the reading is what you supplied, you are charged below the minimum required to even activate the compressor clutch.

If the compressor were cycling, you'd see the low side reading drop down to around 22-23 psi, the clutch would disengage, the low side pressure would rise back up to around 45 psi, and the cycle would repeat. The frequency of the cycle would be determined by several factors including the charge in the system, the ambient temperature, and the heat load being transferred. During more extreme conditions, it might never cycle (it would stay on constantly) and would still be normal.

Are you seeing any evidence that the compressor is engaging or not?

Steve
__________________
If your original owner's manual is missing, download a soft copy from www.fleet.ford.com under the MAINTENANCE tab.

1995 Mustang GT Convertible, only 68K miles.
200 Ford Contour Daily drive.
2001 F250 SD, 6.8L, 4 X4.
2007 Mercury Mariner AWD - Wifey's daily driver

Last edited by projectSHO89; 06-20-2007 at 01:56 PM.
Reply With Quote
  #10  
Old 06-20-2007, 02:01 PM
Senior Member
 
Join Date: Sep 2006
Location: Lexington,SC
Vehicle: 2005 Ford F150
Posts: 601
Post

Check the o-rings in that gauge set.
__________________
2005 King Ranch Supercrew
White/Arizona Beige
5.4 L 3-v
MODS:
Magnaflow SI/DO exhaust system;Leer cap;Bed Rug bed liner;Volant cold air intake system;Sylvania Silver Star Halogens;Carriage Works Billet Grilles(upr & lwr);Putco chrome door & tailgate handles,Edge Evolution,Magellan Integrated Nav System,WOLO air horns.
Reply With Quote
  #11  
Old 06-20-2007, 03:16 PM
Junior Member
 
Join Date: Oct 2006
Location: Mesa, AZ
Vehicle: 2001 Ford F150
Posts: 18
Thanks for the information, I didn't know the compressor and clutch cycled like that. When I got my reading I just snapped the guage on and took it right back off, maybe I should put it on and watch it for a few minutes and see if it dips down, if the pressure dips down I guess the clutch is engauging therefore I must have enough coolant to at least keep the system going. If it just stays at the 45-46psi mark and never dips I might add a little because that will mean the clutch isn't engauging correct?
Reply With Quote
  #12  
Old 06-27-2007, 01:23 PM
Senior Member
 
Join Date: Nov 2006
Location: Memphis, TN 38135, USA, Earth
Vehicle: 1983 Ford Bronco
Posts: 5,334
You can hear the clutch engage, the engine will change tone due to the load, and you'll see the front of the compressor start spinning.
__________________
Walk softly & carry a BIG SIX ! ! !

. . .
Reply With Quote
  #13  
Old 06-27-2007, 11:17 PM
Junior Member
 
Join Date: Mar 2007
Location: SoCal
Vehicle: 1999 Ford F150
Posts: 14
I have the same question except for on a 1999 f-150 5.4L. Any help to locate the low pressure side port?
Reply With Quote
  #14  
Old 06-29-2007, 12:09 AM
Senior Member
 
Join Date: Oct 2002
Location: St. Louis (Out in the woods)
Vehicle: 2001 Ford F250 6.8
Posts: 5,224
Quote:
Originally Posted by supraisthebest
I have the same question except for on a 1999 f-150 5.4L. Any help to locate the low pressure side port?

You'd better be wearing your fire-retardent suit because you're going to get flamed for asking a question I already answered IN THIS THREAD.
Reply With Quote
Old 06-29-2007, 12:09 AM


 
 
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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 On
Refbacks are Off


All times are GMT -4. The time now is 02:32 PM.





This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company
 
Contact Us Advertising Privacy Statement Terms of Service Jobs Forum Text Archives
Emails & Contact Details