A/C help needed, blows cold but not cold enough!
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Posting Guru
Joined: Feb 2007
Posts: 1,327
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From: Las Vegas, NV
A/C help needed, blows cold but not cold enough!
So today I put 2 cans of R-134 into the the A/C system of my truck, using the guage on the hose I charged er to 55 PSI or using the oposite dial on the guage 400 PSI ( all I know is its at the top of the green zone on the guage). The problem is my inside temp vent thermometer tool is still reading 60 degrees. If I read and understood everything correctly I supposedley have a full charge and should have an A/C temp of about 48 degrees or lower. Just curiouds any tips, tricks or ideas. Faulty guage maybee? Maybee I should pull the A/C relay and jump the connection to keep the compressor running while charging? I don't know, Im just baffled.
Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
Okay not what you wanted to hear but those pressures are both way to high. The system should be 35-44 psi low side and 250-270 high side. You may have a clogged orifice tube and the system is now way overcharged.
Postmaster
Joined: Jan 2009
Posts: 2,544
Likes: 4
From: Suffolk, VA
More refrigerant does not = cooler temps. Those pressures are way to high as said above. Let some out and try it.
Then look around here for a thread on the A/C clutch shim mod and see if this might be a problem. It could just be a worn out compressor. Crewcabs have a lot space to cool too, so keep that in mind.
Put the a/c setting at max, fan on high, let it run for 10 minutes and see what you temps you have at the vent.
Then look around here for a thread on the A/C clutch shim mod and see if this might be a problem. It could just be a worn out compressor. Crewcabs have a lot space to cool too, so keep that in mind.
Put the a/c setting at max, fan on high, let it run for 10 minutes and see what you temps you have at the vent.
Logistics Pro
Joined: Mar 2002
Posts: 3,881
Likes: 84
From: Wake Forest, NC
Oh, boy.
You need to put a real set of guages on there to see what is going on. I would really encourage a full evacuate and recharge with the properly measured amount of refrigerant. Knowing how much refrigerant is in the system is the first step to diagnosing any problems.
You need to put a real set of guages on there to see what is going on. I would really encourage a full evacuate and recharge with the properly measured amount of refrigerant. Knowing how much refrigerant is in the system is the first step to diagnosing any problems.
Posting Guru
Joined: Mar 2007
Posts: 1,905
Likes: 2
From: East Peoria, IL
Oh, boy.
You need to put a real set of guages on there to see what is going on. I would really encourage a full evacuate and recharge with the properly measured amount of refrigerant. Knowing how much refrigerant is in the system is the first step to diagnosing any problems.
You need to put a real set of guages on there to see what is going on. I would really encourage a full evacuate and recharge with the properly measured amount of refrigerant. Knowing how much refrigerant is in the system is the first step to diagnosing any problems.
And those pressures are WAY too high. Your high pressure switch is probably close to kicking out at about 400..
Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
Start by reading this thread, starting with post #4:
https://www.ford-trucks.com/forums/8...r-at-idle.html
Read the whole thing to see what's going on with yours.
The thread is only four days old. :-((
Pop
https://www.ford-trucks.com/forums/8...r-at-idle.html
Read the whole thing to see what's going on with yours.
The thread is only four days old. :-((
Pop
Thread Starter
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Posting Guru
Joined: Feb 2007
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From: Las Vegas, NV
Thanks for the replies. I will go over everything listed and see what I come up with. I have an Excellent set of Professional guages but they are older and have R-12 fittings, the hoses are interchangable but have no idea where to pruchase hoses or maybee just R-134 adapters. Any ideas where to start to look for em?
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Hotshot
Joined: Jan 2002
Posts: 17,988
Likes: 207
From: La La Land
I got mine local at an auto air conditioning shop, but you might start here:
http://www.jcwhitney.com/autoparts/S...&zmap=ZX511294
Pop
http://www.jcwhitney.com/autoparts/S...&zmap=ZX511294
Pop
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Lead Driver
Joined: Feb 2000
Posts: 5,374
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From: Palm Bay, Florida
My a/c in my late '99 F350 CC that I believe has never been touched blows 37* air out the vents when in max position idling-I have done the Ranger valve mod last summer and I think it helped mine, I'm in Florida on the east coast where we have very high humidity and temps in the mid-high 90s right now.
I previously had the a/c system in my old '94 OBS F150 re-done a few years back and at the sugguestion of the shop and some folks here on the FTE we swapped in a high performance orifice tube and THAT itself made a difference-my Nephew is still driving the '94 and the a/c is as cold or colder than mine!
I, too believe you've got your system over-charged, I'd bleed some off and re-check-the title of the ULTRA-LONG a/c thread is "WOW-REAL AIR CONDITIONING" if you do a search you will find it, its probably got over 5,000 views now-it comes up every summer! Good Luck & keep us posted!
I previously had the a/c system in my old '94 OBS F150 re-done a few years back and at the sugguestion of the shop and some folks here on the FTE we swapped in a high performance orifice tube and THAT itself made a difference-my Nephew is still driving the '94 and the a/c is as cold or colder than mine!
I, too believe you've got your system over-charged, I'd bleed some off and re-check-the title of the ULTRA-LONG a/c thread is "WOW-REAL AIR CONDITIONING" if you do a search you will find it, its probably got over 5,000 views now-it comes up every summer! Good Luck & keep us posted!
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Posting Guru
Joined: Feb 2007
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From: Las Vegas, NV
So where is the orifice tube, I cant seem to find it in the service manual, is there another name for it?
Logistics Pro
Joined: Mar 2002
Posts: 3,881
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From: Wake Forest, NC
Yeah, except an expansion valve and orifice tube are not the same thing.
So for the right of less confusion, we have an orifice tube in these trucks. ( I know you know pop, not a correction, just don't want there to be confusion)
And a new orifice tube by itself, if it is the right one in there, will (should) not improve performance. If there is crap in it, there may be a bigger problem. There were some dynamic o-tubes a few years back (and probably currently) but I never really thought they were worth it. Your results may vary. They worked more like an expansion valve and varied the orifice size depending on load.
So for the right of less confusion, we have an orifice tube in these trucks. ( I know you know pop, not a correction, just don't want there to be confusion)
And a new orifice tube by itself, if it is the right one in there, will (should) not improve performance. If there is crap in it, there may be a bigger problem. There were some dynamic o-tubes a few years back (and probably currently) but I never really thought they were worth it. Your results may vary. They worked more like an expansion valve and varied the orifice size depending on load.
Posting Guru
Joined: Mar 2007
Posts: 1,905
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From: East Peoria, IL
WHat is your ambient temp? 30* differential is what is considered acceptable and within spec. so if its 90* out, your a/c is "technically" working good.
Whats your pressures?
Does your compressor cycle irregularly or often. Does it seem to follow a pattern in which it will cut out at a certain pressure (high or low side)