Did I screw up my A/C system? - Ford Powerstroke Diesel Forum
 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 07-14-2009, 05:25 PM Thread Starter
Compression Ignition Addict
 
Maverick1701's Avatar
 
Join Date: Nov 2008
Location: Memphis, TX
Posts: 1,374
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Send a message via AIM to Maverick1701
Did I screw up my A/C system?

so I checked my low pressure and it was around 35psi so I added most of the can and it upped it to around 37-40ish.
(if should be 45psi)

I was driving around w/out much of a change....that is until I switched my a/c over to the vent mode and I felt the engine work a little.
I checked pressure on the low side again and it had spiked well into the red zone on the gauge...once I switched back to max a/c it was back down to 37
Is this normal?!?!?!

on max it still blows cool air (about the same temp as before) and the same psi

When i click it over to vent my pressure climbs to 140psi where it plateaus and remains at 140psi

Any ideas?

ChrisChris
2003 Kawasaki KLR650
1997 Ford Expedition 4x4
1967 Kaiser Jeep M35A2 6x6
2016 Silverado 4x4 Crew-Cab LS/Police


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maverick1701 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 07-14-2009, 07:52 PM
Emergency Services
 
metallitera's Avatar
 
Join Date: Aug 2008
Location: Texas!
Posts: 747
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
when u say vent, do u mean A/C OFF, or OUTSIDE air with A/C ON as opposed to re circ inside air?

when A/C is OFF i believe the pressure equalizes throughout the system, thats why you only go off readings while system is ON.

someone correct me if im wrong.

-ReD

Fire Lieutenant/Paramedic, Tinkerer

1990 Jeep Wrangler YJ
metallitera is offline  
post #3 of 7 Old 07-14-2009, 08:53 PM
Emergency Services

 
Join Date: Apr 2008
Location: Beeville, TX
Posts: 1,489
Thanks: 1
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Correct! When the compressor is not running (vent mode or off), the high and low sides equalize. It will end up being about 140-180ish on both sides. As soon as you click the compressor on, it will drop down on the low side, and up on the high side.

About the running pressure, 37-40 is a little low still. R134a is picky about the pressure it runs at. A little high or a little low will both be less efficient than having the exact amount for your particular application.

45 psi on the low side is good if your ambient temperature is 80 to 85 degrees. If you are in South Texas at 104 ambient temp, the low side will be 60ish.. There are charts that detail what ambient temp and what pressures are normal.

Eli Benson - EMT, Ambulance Mechanic
----------
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance
elibenson is offline  
post #4 of 7 Old 07-14-2009, 09:37 PM Thread Starter
Compression Ignition Addict
 
Maverick1701's Avatar
 
Join Date: Nov 2008
Location: Memphis, TX
Posts: 1,374
Thanks: 0
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Send a message via AIM to Maverick1701
Quote:
Originally Posted by elibenson View Post
Correct! When the compressor is not running (vent mode or off), the high and low sides equalize. It will end up being about 140-180ish on both sides. As soon as you click the compressor on, it will drop down on the low side, and up on the high side.

About the running pressure, 37-40 is a little low still. R134a is picky about the pressure it runs at. A little high or a little low will both be less efficient than having the exact amount for your particular application.

45 psi on the low side is good if your ambient temperature is 80 to 85 degrees. If you are in South Texas at 104 ambient temp, the low side will be 60ish.. There are charts that detail what ambient temp and what pressures are normal.
PHEW! That is GREAT news.... I saw that needle going up and up and all I could hear was $$$$$$$$$

As long as it is doing what it should....that is good news

The info on the can says for 100*-110* (south-east tx) the psi should be 55 but but I am still at 37

ChrisChris
2003 Kawasaki KLR650
1997 Ford Expedition 4x4
1967 Kaiser Jeep M35A2 6x6
2016 Silverado 4x4 Crew-Cab LS/Police


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Maverick1701 is offline  
post #5 of 7 Old 07-14-2009, 09:44 PM
Mob boss

 
Jarrod B's Avatar
 
Join Date: Jul 2008
Location: Austin Texas
Posts: 26,951
Thanks: 25
Thanked 29 Times in 27 Posts
Mentioned: 2 Post(s)
Quoted: 148 Post(s)
Feedback Score: 1 reviews
subscribed

2006 Ford F250 CCSB FX4 6.0

Sold
1997 F350 CCLB 2WD 7.3
1999 F350 CCLB 4WD 7.3
2003 F350 CCLB FX4 6.0



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



LSP Chapter Director

LSP Group Threads

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Jarrod B is offline  
post #6 of 7 Old 07-14-2009, 09:45 PM
Emergency Services

 
Join Date: Apr 2008
Location: Beeville, TX
Posts: 1,489
Thanks: 1
Thanked 1 Time in 1 Post
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
I threw out some numbers from memory, so they may not be exactly on the money..

Sounds like you need another can of refrigerant..

Eli Benson - EMT, Ambulance Mechanic
----------
'08 F350 Dually KR - Spartan'd
'07 F250 CC SB 4x4 XLT - SCT /w Innovative Tunes
4 '09 & '10 E350 6.0l ambulances
1 '08 Duramax 6.6 (LMM) van ambulance
elibenson is offline  
post #7 of 7 Old 07-15-2009, 04:53 AM
Member
 
ghostang93's Avatar
 
Join Date: Jun 2008
Location: Pace, FL (just over the river to the east of Pensacola)
Posts: 36
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
That next can of refrig you throw in, you might grab one that has the dye in it. That ways you can use a black light to check for leaks a bit better. Don't know who needs the A/C more, you in the high heat of TX or me with the high humidity of FL, either way its sucks without it.

Dave D

1994.5 F350
4x4 with 285/75R16
5 Speed Manual
4.11 Gears
1st Year Stroker still going at 287K
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Fuel Regulator Shim
Homemade Tymar Intake
3" DP with 3.5" Straight Pipe
ghostang93 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome