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'94 Prelude Si a/c freon capacity specifications

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Old Jul 23, 2008 | 05:31 PM
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From: Byron, Ga, USA
Default '94 Prelude Si a/c freon capacity specifications

Can anyone tell me the capacity for the refrigerant oil and freon capacity for the above mentioned model. I just rebuilt the a/c system and put what the book called for in it but am not getting the pressures that the book calls for. At idle low pressure is around 16 psi and high is around 150 - 160 psi. The book (non oem) calls for 16-40 psi low side, 212-285 psi high side. When I put enough freon in to get the pressures the book calls for the compressor clutch started slipping.
I kinda wish I had gone with mineral oil and r12 now.
I have not received the manual that I ordered for this car yet.
tia
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Old Jul 24, 2008 | 01:41 PM
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Called the service writer at the local dealer and found out it is 1.3 to 1.4 pounds.
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Old Jul 24, 2008 | 04:51 PM
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Default Re: (engatwork)

how much did you have in there ? Pressures will vary on ambiant temps.
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Old Jul 24, 2008 | 06:13 PM
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Default Re: '94 Prelude Si a/c freon capacity specifications (engatwork)

I pulled it out when I got home today, vacuumed and recharged and it had about 1.75 pound in there. I attempted to put 1.3 pounds in it and now I think it is slightly low. I will do it again tomorrow. It looks like I am winding up with about a 1/4 pound in my hoses when I'm finished charging. My recovery machine has a sight glass on it that is graduated in 1/16ths of a pound. The dash vent temp is still not blowing quiet cold enough. If I had gone with r12 it would not have to be this precise and I have not ruled out going back through the system and going to r12 and mineral oil.
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Old Jul 25, 2008 | 06:03 PM
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Default this thing is kicking my tail

I'll bet I have evacuated, vacuumned and recharged it at least 4 times now. I finally compared the pressure differences between a DelSol that was blowing cold versus what I am getting. It looks like the rebuilt compressor I installed is not doing the job. The pressures on the DelSol were around 40 on the low pressure side with 225 on the high pressure side. I also compared it with a '94 Integra that is not blowing cold. The pressures on the Integra were low too. Whenever I put enough freon in to make it blow cold like it is supposed to the compressor clutch starts slipping and the high side is swinging around to beat the band. I'm thinking about installing a new Honda compressor to see if I get the proper pressure off of it. Another option would be to go to r12 which I have a bunch of. I'd just haev to deal with the hose connections, maybe go with '92 Prelude hoses. The r12 would be providing lot's of cold air at those pressures.
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Old Jul 27, 2008 | 11:07 AM
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Default Re: '94 Prelude Si a/c freon capacity specifications (engatwork)

I talked to the guy where I purchased the compressor and he said come by and pick up another one to try it tomorrow afternoon. Worst case I'll end up going to the dealer and ordering a brand new one$.
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Old Jul 29, 2008 | 01:10 PM
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Default some follow up

I had someone else take a look at it and they said to try a different expansion valve so I have one coming. I did have it slightly undercharged. It looks like the hoses I have hold about 1/4 pound in freon .
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Old Jul 30, 2008 | 12:19 PM
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I hate to be the only person responding to my postings but ya'll leave me no alternative.

Picked up a new expansion valve from the dealer and will be installing it here in a few minutes. Man it is hot outside but that is just part of living in these parts.
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Old Aug 1, 2008 | 02:43 PM
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Default Re: (engatwork)

Got into the system Wednesday of this week (today is Friday) and found a bunch of little pellets in the discharge line between the dryer and expansion valve. The pellets look like dessicant. Ran the car some on Thursday with the a/c working only every once in awhile at certain rpms. Tore back into it this afternoon and found some more pellets in the expansion valve and again in the discharge piping. Replaced the dryer, put the system back together and am vacuuming the system down as this is being typed.

I will post a big smile here in a little while if it works the way it is supposed to.
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Old Aug 1, 2008 | 04:41 PM
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From: Byron, Ga, USA
Default Re: (engatwork)

It is blowing as cold as I think it is capable of now. What an ordeal.
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Old Aug 11, 2008 | 02:40 AM
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Default Re: (engatwork)

The first reman compressor I had installed did not make it because the clutch slippage finally did it in. I took everything apart again, replaced the discharge line between the dryer and evap, replaced the evap and tried another compressor. In addition, I flushed everything out thoroughly again. The discharge line between the dryer and evap was completely plugged. Now I am not getting the 12 volts to the compressor necessary to pull it in. I have not attempted to trouble shoot that part and was jumping the power to the compressor straight from the battery to insure the refrigerant side was working and the pressures look good. I think it may be slightly overcharged and plan on evacuating, vacuuming and charging it again. In addition to cooling good the suction pipe at the low pressure connector is cold like it should be. The reason I am going to go back into it is because on occasion with the jumper in place the clutch on the compressor slips every now and then. If I continue to have compressor issues I will try another one and will try to find a new one this time..
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Old Aug 20, 2008 | 06:50 PM
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Default Re: (engatwork)

I finally had to replace the condenser again. Seems that there was a bunch of debris had remained in the discharge line from the compressor to the condenser even after I blew the lines out and then wound up plugging the new condenser. I went through the procedure again and now it will blow good and cold but unfortunately the circuit is not pulling the compressor in anymore. I will be troubleshooting that issue tomorrow. My first thing to check will be the pushbutton unit to see if it needs to be resoldered.
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Old Aug 21, 2008 | 09:16 AM
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Default Re: (engatwork)

I ended up having to replace the dryer again too. I have learned my lesson on the Hondas in regards to a/c repair. Next time I run accross one that has a bunch of little ***** in the refrigerant side of an a/c I am going to replace EVERYTHING from the start. In addition to the pluggage in the system I found one of the solder joints on the pbu burned out and had to install a jumper on it. I suspect I caused that when I was testing the evaporator temp sensor.
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Old Aug 21, 2008 | 05:11 PM
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Default Re: (engatwork)

Check to see if the green light comes on when you press AC. If not, its likely just the AC switch. The contacts much like the defrost button for the power mirrors (canadian models) fails the same way somewhat. The metal tab (after much use) bends too much and no longer maintains the power/connection to the contact after its depressed.
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