Model: Jetta TDI 4dr Sedan
Engine Size: 2.0 TDI
Refrigerant Type: 134A
Ambient Temp: 65
Country of Origin: United States
I bought this (MAC Tool - Model AC 900 ) machine that was made by Robinair for MAC Tool.
Information Listed on Front of AC 900 Machine:
Dual 12 or 134a
Note: I checked the Robinair Web Site and found some PDF Down loads.
My MAC AC 900 or MAC/ Robinair machine is similar to - Robinair Model - 12134 B (a dual purpose, R 12 or 134A, guessing, was made around 1997 or so 1998 or ? My MAC AC 900/ Robinair 12134B and has the same control features but it's laid out a little different. I have the Operating Manual that came with it.
MY No# 1 Question:
I bought this machine about a year ago, I just found out that I don't have everything that should have came with the AC 900. I'm missing the (2) holding tanks that set on top of the scales. (1) tank is on the R 134A side and R 12 on the other side. Both tanks are missing, I checked the operating book and saw that they feed (3) lines into the Refrigerant Tanks. (1st) line is the Blue Line and (2nd) is the Red Line and (3rd) is a Yellow Line. The (3) lines feed from the back of the AC 900 machine. I see a (2) valve arrangement on the top of the tank (in Operator Manual) for the Red & Blue Line. The Yellow Line (purge line) is shown separate and feeds directly into the refrigerant tank. Note: these Refrigerant tanks set on the scale pads, (1) is on the R 12 side, and the 2nd on the R 134a side on the back of the AC 900 at the bottom.
*** I bought this AC 900 machine without the (2) tanks. I have two 134A refrigerant tanks that are empty, they're left over from serving my cars and trucks... over the years.
I'd like to try to adapt an empty R 134A tanks over to receive (recovery) the R 134A refrigerant from my 2013 Jetta. I was thinking of using the Valve System from a R-134A Service Gauge set.
***** Can Anyone Tell me How I can Reconstruct the Missing Tanks that should have come with the AC 900 machine ?!?
I have two R 134 Freon tanks and (2) different service gauge sets that I could adapt over. I don't know about the running of the yellow (marked as purge line in the book) line into the tank... could I/ should I modify the 134 Freon tank or not.
I don't have the original Freon Tank from this AC 900 machine to look at, so I'm lost and created this post to get some help.
**** The whole purpose of getting my AC 900 up and running is to service my 2013 Jetta AC System, 1st a Recovery and then Re-Service. I have a 2013 Jetta that I'm pulling the engine out of, rebuilding with long block. I need to recover the R 134A refrigerant from. The Jetta car is (1,198 miles) nearly new and AC system is 100% A OK.
If you have 2 tanks, then you have the 12135B machine. The R134 side has 1/2 acme hoses, and the R12 1/4 flare so they can't be mixed up. You can use whatever side you want, so if your new/existing tank has flare, then use this side of the machine. The yellow air purge connects to a spare fitting that sits at the top of the tank and had no dip tube. The machine measures the pressure at this fitting and compares it to a bulb of R12 or 134a, and if it's high (indicating air in the tank) then the machine releases this out. You don't need this to run the machine, so just keep your eye on tank pressure indicating excess air in the tank.
These machines came with a dry running compressor that usually didn't last long, and cost a fortune to replace. In addition, the machine does a clearing process first to empty the charge hoses, and because the compressors are usually knackered, it can't get low enough vacuum to trigger the switch that tells it the lines are empty, and switch over to the next process. This is also has to happen when it's finished recovery so it knows the car is empty. And finally, this also needs to happen to change the machine from R12 to R134 and vice versa. All of these processes can be over ridden if necessary, althoug the R12 to R134 is a bit complicated. I think they also suffered from busted circuit boards occasionaly, again usually writing off the machine.
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