A/C HIGH / LOW PRESSURES
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Tuned
Joined: Feb 2006
Posts: 354
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A/C HIGH / LOW PRESSURES
'05 6.0L PSD EX.. REAR AIR.... WHAT SHOULD MY AIR CONDITIONER PRESSURES BE AT IDLE, HIGH SIDE? LOW SIDE?
TAKES A LONG TIME TO GET COLD,,, 12-15 MILES DRIVING
GAUGES SHOW 35L, 225 H
TAKES A LONG TIME TO GET COLD,,, 12-15 MILES DRIVING
GAUGES SHOW 35L, 225 H
Hotshot
Joined: May 2005
Posts: 13,484
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From: Stevens Point, WI
I am not an AC guy at all, I just know how to replace the components and hook up the bottles until they are empty. The one kit I have to put the fluid in has a gauge on it and I remember the 'green' part of the gauge is somewhere around 85-120psi.
I know the fluid always goes in the low side when filling with the engine running and AC on. I will take a look at the gauge today if I remember and get the actual numbers off it. Unless a Ac guy chimes in.
I know the fluid always goes in the low side when filling with the engine running and AC on. I will take a look at the gauge today if I remember and get the actual numbers off it. Unless a Ac guy chimes in.
Senior User
Joined: Nov 2008
Posts: 319
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From: near mm217 off I-70 in MO
Those pressures don't sound too bad at idle. My 2000 takes a bit to get going also, once it is going it works well. Maybe add a heater hose shutoff valve?
https://www.ford-trucks.com/forums/7...off-valve.html
https://www.ford-trucks.com/forums/7...off-valve.html
Senior User
Joined: Nov 2010
Posts: 450
Likes: 1
I've been working on my A/C also. I'm guessing those pressures are fine.
Is your front ok and rear warm? If that is the case you need a new thermal expansion valve. That valve controls how much refigerant can flow through the coil and hence, how much cooling. If you are running about 40 degrees out of the compressor I'd think 45-50ish would be your vent temp after a couple minutes.
Is your front ok and rear warm? If that is the case you need a new thermal expansion valve. That valve controls how much refigerant can flow through the coil and hence, how much cooling. If you are running about 40 degrees out of the compressor I'd think 45-50ish would be your vent temp after a couple minutes.
More Turbo
Joined: Jul 2010
Posts: 669
Likes: 7
From: Tennessee
Why don't you measure temperatures and tell us what it is doing. If you are 50-55 degrees with the fan on full and the RPM's up a little you can't ask for more than that. It takes it a long time to get cold at the vent or in the cab? If it is 120 in the cab it will probably not be cold when it comes out the vent. If it is 90 in the cab it should be cold coming out the vents. Are we talking after it has sat in the sun all day or what here? Is it just the rear AC that is hot and the front is ok?
If it has been sitting in the sun all day especially if it is a dark colored vehicle it will take a while to cool all that thermal mass.
http://www.motorcycleproducts.org/Ex...stem-tests.pdf
Perry
If it has been sitting in the sun all day especially if it is a dark colored vehicle it will take a while to cool all that thermal mass.
http://www.motorcycleproducts.org/Ex...stem-tests.pdf
Perry
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New User
Joined: Nov 2010
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I don’t remember the outside temp when I did this but it was mid 80s I suppose. At the AC vent I read low 40s at an idle and the refrigerant pressure was reading within the specs of the cheap gauge I was using. The issue is when I accelerate or climb even a modest hill the air will blow warm. It is obvious the AC clutch is disengaging in these unique conditions.
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Senior User
Joined: Nov 2010
Posts: 450
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MMG, check out your compressor clutch using this method. Someone posted it in my thread about a/c
SpringerPop's Compressor Clutch Air Gap
SpringerPop's Compressor Clutch Air Gap
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