Recharging an ac system question
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Recharging an ac system question
In my 1990 F350 truck the AC isn't currently working because the schrader valve on the low side leaked out all the refrigerant a couple of years ago.
Does anyone know how many 12 oz cans these trucks take? My truck has the 7.5L engine.
Would I need to change out the receiver dryer as well as the orifice tube?
Does anyone know how many 12 oz cans these trucks take? My truck has the 7.5L engine.
Would I need to change out the receiver dryer as well as the orifice tube?
Fleet Owner
Joined: Oct 2005
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From: Kentucky
Personally I would not downgrade to an inferior refrigerant. But if you feel the need to do so the Ford manual states 33 oz. of R14a for a 1995 F series truck (factory R134a).
You will also need a red orifice tubes versus the blue one that should be in there for a R12 system.
I highly suggest you change the receiver/drier to on suitable for R134a.
Be aware the hoses on your 1990 do not have liners in them. The smaller R134a molecules will permeate the hoses much faster, meaning leak out. Add in 20+ years of service they are already leakers, R134a will make the problem worse.
You will also need a red orifice tubes versus the blue one that should be in there for a R12 system.
I highly suggest you change the receiver/drier to on suitable for R134a.
Be aware the hoses on your 1990 do not have liners in them. The smaller R134a molecules will permeate the hoses much faster, meaning leak out. Add in 20+ years of service they are already leakers, R134a will make the problem worse.
i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
agreed. that is the main reason why i do not convert. plus the R-12 just cools better. my truck blow sub 40 degrees out of the dash outlets. i have never seen a conversion cool any better than 55 degrees from the outlets..
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Lead Driver
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Yea good idea to replace the drier at the very least, they can be the cause of a poorly functioning system because they get clogged up.
134 may be inferior, but a properly functioning system will still freeze you out.
134 may be inferior, but a properly functioning system will still freeze you out.
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Fleet Owner
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From: Kentucky
In all honesty you will find thousands of threads on this topic. Some have no issues with a cheap and dirty conversion, others not so much. My theory is if you plan to keep the truck, rebuild the A/C system the right way.
Personally I still would not do a R134a conversion. New hoses, yes. New condenser? probably not because the older systems are not as prone to clogging up with no way to clean them as the more efficient parallel flow version on later models. New receiver/drier, orifice tube, compressor, lines and a thorough flush...good to go.
I do my own A/C work and have made my fair share of bad decisions based on money and learning curve. Your mileage may vary.
Personally I still would not do a R134a conversion. New hoses, yes. New condenser? probably not because the older systems are not as prone to clogging up with no way to clean them as the more efficient parallel flow version on later models. New receiver/drier, orifice tube, compressor, lines and a thorough flush...good to go.
I do my own A/C work and have made my fair share of bad decisions based on money and learning curve. Your mileage may vary.
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Ok, so I was able to verify that the system does not leak with the gauges and I put 36 ounces of 134a in which is 75% of what you guys recommended for r-12.
The compressor comes on and the air output is cold. Is that ok that I only put in 75% or is that too low and will that create any problems?
The compressor comes on and the air output is cold. Is that ok that I only put in 75% or is that too low and will that create any problems?