| Author |
Message |
kelly vince (Tofosi1)
| | Posted on Sunday, July 15, 2001 - 9:06 pm: | |
Sorry Herb,
But I am changing the system to 134A. I didnot get the filter, but during this as I should say TESTING STAGE. I want to see how it works first. if it fails I promise I'll look for the filter.
Today we got good vacum and loaded 2 cans of 134A. I got 60 degrees in traffic, and 50 on the interstate. I want to give it a couple of weeks to see how it goes. If it goes wrong I'll be braking the system a part again. If it goes well I'm going to load 6oz of the 3rd can, which should be 80% of the orginial 2.5lbs of R12(2.5 12oz cans).
By the way this car has not had the AC run in over 7 years so when I did the timing belt job in March there was no R12 in it. We were able to take the compressor off. Easier to work on that front bank.
I'll report back in a couple of weeks or sooner to let you know how it's going.
Thanks for all your help. |
Herbert Edward Gault (Irfgt)
| | Posted on Sunday, July 15, 2001 - 5:31 am: | |
You can go to a shop that can recycle your freon 12 and put it back in without the expensive loss. The drier does have a small useless filter but that is not it's main function. Get the inline filter or you will be writing again. |
kelly vince (Tofosi1)
| | Posted on Saturday, July 14, 2001 - 10:29 pm: | |
Nope, I'll get you the part #'s if you want. The drier was $49.00, expasnsion valve $25.00, two new 134A fittings. $20.00(NAPA) Ester oil $5.00
3 cans of 134A from Wallmart $4.88 each
Total about $110.00
Got to get a freind to evacuate it for you and load it.
1 Case of beer.
Price for 3 cans of R12 $150.00
Was not a hard decision to switch to 134a. |
Gene B. Radcliffe - 308 GTS (Brcbank)
| | Posted on Saturday, July 14, 2001 - 7:30 pm: | |
Is it possible to remove and/or inspect the expansion valve and/or the drier without losing the current charge and having to spend a fortune refilling with freon? |
kelly vince (Tofosi1)
| | Posted on Saturday, July 14, 2001 - 5:20 pm: | |
You know how some of the guys told me to look for a filter, well the car does have one. it's in the drier. The old drier's filter had broken down, thus the trash went to the expansion valve.
Thanks for all your help. |
Herbert Edward Gault (Irfgt)
| | Posted on Saturday, July 14, 2001 - 4:24 pm: | |
I take a week off every 6 weeks so I cannot be here all the time. Anyway, I would also recommend an inline filter be added as extra insurance to your expansion valve. A lot of times the insides of the old hoses wastes away and will collect in the expansion valve and the filter would collect it first. The filters are available at most parts houses. |
kelly vince (Tofosi1)
| | Posted on Friday, July 13, 2001 - 10:07 pm: | |
To late,
Thanks for your response Herb. Thanks to everyone.
Here the results.
I went ahead and took the systems apart. The new expansion valve was full of rust and black particles.
I started tracing the rust and particles. They came from the old drier. The x owner must have noticed a sudden lose of AC, becasue the drier went south and after inspecting the old expansion valve it was full too.
So, I have cleaned everything out with shop air. Mostly what was between the drier and the expansion valve.
I will evacuate tomorow and hopefully have air.
It's getting real hot here in Cajun land.
Last week at no problem raceways, it was 110 in my car and 98 in the shade. Check this place out at www.noproblemraceway.com. Our next race day is the 11th of August, maybe I can drive the 230 miles round trip from my house in cool AC.
Thanks again. |
Herbert Edward Gault (Irfgt)
| | Posted on Friday, July 13, 2001 - 6:20 pm: | |
With only one can of freon added to the system, there could easily be a vacuum on the low side and nothing wrong. Do not attemt to diagnose the system until it is filled to it's capacity. There may not be anything wrong with your system. |
Warren E. Smith (Magoo)
| | Posted on Tuesday, July 10, 2001 - 9:44 pm: | |
Kelly, what Steve says is true the expansion is different with the 134A compared to the R12. Use 80% because any more that that will cause too much head pressure on the comp. |
kelly vince (Tofosi1)
| | Posted on Tuesday, July 10, 2001 - 9:35 pm: | |
Great News. Thanks
This is what I have been looking for. My problem is not the compressor. I get high pressure on the high side. If it were a compressor problem I would get even pressure on both sides because the compressor would not be compressing. Get it. There is a restriction some where. Just got to find it.
Let me ask you one thing, My manual says 2.5LBS of freon. The Ice man told me to load 80%, So, that would be 2 and 1/2 12oz cans. Are you telling me you got 34 degree on just 24oz. I need to know this cause I was planing on loading 32oz.
Let me know.
Thanks
I hope to get all of ths written up and posted to the web, expansion valve and drier part numbers. |
Steve (Steve)
| | Posted on Tuesday, July 10, 2001 - 8:51 pm: | |
Kelly I just did the conversion on my 77 308 GTB a few weeks ago.Had a blown compressor and replaced it with the NAPA (York) compressor and used the old clutch assembly. I used the a can of leak detector/sealer and a can of quick cooler and then 2 cans of 134A. I was told to fill the system up to 80% of the R12 capacity (different expansion factor and higher pressure with 134) and my vent temp was 34-36 degrees or in the gray scale of the vent thermo. System blows cold and has been great in the 95 degree weather we have been having. Good luck . Steve |
kelly vince (Tofosi1)
| | Posted on Tuesday, July 10, 2001 - 1:28 pm: | |
Thanks Sam,
I'm going to start takin' apart again in a couple of days. Talked to a guy I went to High School with who owns an AC Shop. He said to take it apart and start blowing shop air until you see which part has the restriction. He said to look for bent hoses and such. I'm then gonig to flush the system and start over, I'll keep yawl updated. I hope to have vent temp reading soon on converting to 134A. |
Sam NYCFERRARIS (Sam)
| | Posted on Tuesday, July 10, 2001 - 12:24 pm: | |
You might want to wait until Herb gets back, he is the world's A/C expert (seriously) |
Warren E. Smith (Magoo)
| | Posted on Sunday, July 08, 2001 - 11:19 am: | |
Kelly, Personally I would dissmantle the system and flush the entire thing. You can buy flush at auto stores in aerosol cans. You have to figure just blowing it out may not be enough to clean the cond., evap., comp. etc. completetly. Warren |
kelly vince (Tofosi1)
| | Posted on Sunday, July 08, 2001 - 8:40 am: | |
Warren,
I did all the oil thing, drained it measured it and added ester oil. The only side I didnot blow out was the low side. Mostly becasue the car had not had the AC run n about 7 to 8 years. So, our first choice was the expasnion valve. I'll be taking it apart agian this week and blowing the low side. I have also heard to let it blow out on a white rag, becasue of the hose is going away you will be able to see pieces of it on the rag.
Thaks for the help. |
Warren E. Smith (Magoo)
| | Posted on Saturday, July 07, 2001 - 11:09 pm: | |
Kelly, that screen you speak of I don't think exits in that A/C system. It is in some later model systems such as G.M. cars. If it was there it would get clogged if the compressor went bad or dessicant from the dryer got into the system and small foreign particles could get trapped. I assume that your compressor was ok. You replaced the dryer. Did you flush the system before converting? I'm sure you pre-measured the oil when you drained the system. Just retrace your steps. Sorry I couldn't be more positive help. |
kelly vince (Tofosi1)
| | Posted on Saturday, July 07, 2001 - 9:57 pm: | |
I switched from r12 to 134A, I have changed the oil, dryer and expansion valve. After I changed the dryer the original expansion valve got cold and then went hot. We got very little pressure on the low side, we decided it was the expansion valve. So, I put in a new expansion valve. I also blew out the high side line. Today we evacuate and put in new 134a. Now after we put in a can, the low side goes to -10 lbs of pressure.
I have heard thier was a screen that could block the system, but where is it in the system. I did not see it when I had it apart. Please help.
Thanks
I have the passion. Tofosi! |