W123 300D R134 AC Conversion 

Thanks for the video! I’m about to attempt this on my 82 300cd. It will most likely take longer than 8 hours to do this job, but you’ve definitely given me the confidence to give it a shot. Keep up the great videos!

We had to convert to R134a almost 30 years ago here in Australia so unless a car has been locked away forever ,it will be a conversion already . Thankfully the aircon on a W123 is simple (but not the hated push button A/C) .Now we are being allowed to use the 123 gas ,as a drop in replacement. (note: i said 'allowed',this is socialist Australia where we are told how to live) .Also interesting to see the hose running in front of the crank pulley. All of the RHD W123's with the OM 617 here have a steel pipe running behind the pulley with a rubber hose on each end. if it needs replacing ,,it turns into a major job to get at it.

Yet another awesome video! Your channel deserves a lot more credit for its quality content. Congrats !

Great work on the R134 conversion John. I know it takes a lot of time and effort but the results really are worth it!! Got some tools delivered today so I’m planning to tackle the door latch inserts tomorrow. Wish me luck.

I remember reading the early merc compressors were nicknamed grenades, My 83 has a Harrison or something like that, I believe they were manufactured by G.M. Do you think that the 134A conversion will cool better than the original R12? , we all know 40 year old technology has greatly improved. Your camera work and close ups are amazing, its great you include all the packaging and detailed info. One day I will tackle this project, I don't drive mine on long trips anymore, 50 miles on way are the norm. Great work! really

Love your vids man! Love seeing the journey on all your vids from all around car guy, to w123 expert. Quick question on the final order of recharging: 1. 2oz of oil through the high side port with engine off 2. Turn on engine 3. 1 can of r134 through the low side 4. 2 oz of oil through low side 5. Another can of r134 6. Last 2oz of oil 7. Last can of r134… Am I getting that right?

Thanks for video, question do you have a parts list?

Hey John, Great detailed video! Also thanks for the advise on the phone some weeks ago recommending Alex for injectors! I have an '83 and new to me a few months ago and would really like to get the AC going. The OEM compressor is disconnected and locked up. Do the AC Delco or Four Seasons compressors only last 5 years? I here there is another compressor (Sanden?) but looks like big bucks! For all the labor, I may just keep the car home on really hot days, ha! Let me know your thoughts about why the compressors don't last.

Thanks for the video, really clears up a lot of mysteries with ac systems. One question I have is, it seems you are adding oil slowly in between fills of refrigerant. Is there a reason you do it that way as opposed to filling all the oil at the beginning all at once?

You done good job

Covered all the bases should be fine for a long time 👍👍

My 123 was converted properly. Whoever did my 126 before I bought it, should have their tools confiscated. Lunched the compressor a few months after I got it. The sludge that came out of the system when I flushed it looked like a mixture of graphite and motor oil. I think I spent a couple of hours flushing the system alone.

John, is it possible to install AC system on Mercedes W123, if the car has factory basic configuration?

Hello can you please tell me whats the quantity of r134 gas in that w123 Done a r134 conversion put around 600grams of gas butt not that cooling enough don’t know about the right quantity Mine is m102 petrol

How do I find how many oz of oil to put in? And what type of oil? Esther 100? or .. PAG 46?

Is the new compressor installed dry without any oil? The system(including the compressor) is oiled strictly by the injections?

A vacuum test is not the same as a pressure test because applying vacuum can seal an o-ring that could otherwise leak under pressure. So why did you choose not to do a pressure test with nitrogen or other inert gas? I am assuming you had a good reason, such as confidence that all your o-rings were brand new, etc., and I know many other accomplished mechanics who don't bother with nitrogen pressure tests. What is your thinking on doing a nitrogen pressure test?

19:36 What's happened with old valve?

Dude.