a/c refrigerant capacity
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Senior User
Joined: May 2015
Posts: 282
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From: Sonora,Ca
a/c refrigerant capacity
Hey guys, new to this forum. Just switched my ac system from r12 to r134. Wondering how many ounces of r134 to use to fill a completely empty system. Thanks
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Senior User
Joined: May 2015
Posts: 282
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From: Sonora,Ca
Ok, so i charged it to 35psi at idle. The thing is when i throttle up the engine it drops to 20psi and the clutch disengages. Does that mean i just gotta add more? I have about 27 ounces in it so far
i ain't rite
Joined: Mar 2005
Posts: 65,548
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From: Marlboro Mental Hospital.
27 ounces is not even 2 lbs. you should have closer to 36-38 ounces in the system.
you also want around 35 psi on the low side and no more than around 250 psi on the high side.
you also want around 35 psi on the low side and no more than around 250 psi on the high side.
Tuned
Joined: May 2014
Posts: 317
Likes: 16
From: Richmond, VA
so i charged it to 35psi at idle. The thing is when i throttle up the engine it drops to 20psi and the clutch disengages.
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
Hence the reason why you should charge by volume not pressure.
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Thread Starter
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Senior User
Joined: May 2015
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From: Sonora,Ca
So how many psi do i need to stop that at idle. 30 to 40 psi is the safe zone on the low side. Its holding at 35 at idle right now
Tuned
Joined: May 2014
Posts: 317
Likes: 16
From: Richmond, VA
rla2005 is correct, it's volume, not pressure that will stop the idle dysfunction.
I charge by pressure, because once the pressure remains even at 35 it's typically full. Also, you need to check the outside temperature. 35 PSI is only accurate if it's roughly 85 degrees. The filler hose you get should give you pressures v. temps.
Sorry for the confusion.
I charge by pressure, because once the pressure remains even at 35 it's typically full. Also, you need to check the outside temperature. 35 PSI is only accurate if it's roughly 85 degrees. The filler hose you get should give you pressures v. temps.
Sorry for the confusion.
Hotshot
Joined: Jul 2020
Posts: 10,501
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From: Near Salt Lake City
Just google any truck or car anytime the sticker is missing
Rule of thumb is the new systems use way less than the old ones
I can say without even looking that your 1998 truck takes just under 2 pounds
Whatever it takes, you add 4 ounces for the gauge set
I will look now on google for yours frodo2222
Found one 4 Seasons puts out charts as do others
Yours holds 44 ounces R134a and 9 ounces PAG-46 oil (without rear air) 64 and 13 with
Rule of thumb is the new systems use way less than the old ones
I can say without even looking that your 1998 truck takes just under 2 pounds
Whatever it takes, you add 4 ounces for the gauge set
I will look now on google for yours frodo2222
Found one 4 Seasons puts out charts as do others
Yours holds 44 ounces R134a and 9 ounces PAG-46 oil (without rear air) 64 and 13 with
5th Wheeling
Joined: Dec 2010
Posts: 28
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thank you!!!..mine was working great BUT in the process of building out the rear of van punctured a line back there and although there was no AC working in back the line did hold pressure so I ended up taking out all the lines and assorted parts of back AC..a tiny amount of yellow oil came out of back line but all the front didnt get touched other than to put a cutoff block off kit
I'm assuming since it had the pag oil in the compressor etc etc in front it should be ok but your thoughts?
Hotshot
Joined: Jul 2020
Posts: 10,501
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From: Near Salt Lake City
You might need to split the difference depending where the block off plugs are located
Meaning it might take more freon than a simple front only unit
With a difference of 20 oz. you might need 10 more if the evap only is blocked off
If the block offs are up front, you may only need a few more ounces
Meaning it might take more freon than a simple front only unit
With a difference of 20 oz. you might need 10 more if the evap only is blocked off
If the block offs are up front, you may only need a few more ounces
Hotshot
Joined: Jun 2015
Posts: 12,867
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Do you have a conversion van? The van has rear a/c that isn’t working or it only has front a/c but there are lines for rear air? There would be a difference in amount of charge. You are going to replace the lines with front a/c parts?