BenzWorld Junior Member
Date registered: May 2016
Vehicle: 1984 300D Turbodiesel
Location: SoCal, USA
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Air Conditioner r12 - r124a Conversion Catch-22
Hello Everyone! Been lurking for a couple years - time for my first post.
I bought a 1984 300D Turbodiesel a little over a year ago. It's been great so far and I've been very happy with the purchase. Very solid cars - I even drove it from SoCal to Denver and back in the middle of August with no problems. 270,000 miles, with working windows, sunroof, dash lights, A/C and cruise control!
Except the A/C has lost much of its juice and doesn't blow very cold anymore and doesn't seem to work at all if it is much hotter that 90 F outside. So, I've been thinking about giving it a recharge now that summer is coming. Here's the problem:
Naturally, it came with r12 in 1984. I obtained service records from the seller and he had the A/C recharged in early 2014 and the invoice says r134. So, I thought it had been converted and I could start by just trying one of the spray cans you can get at the auto stores. Then I looked at the lower valve where it's supposed to be filled and it had the old r12 style threaded valve instead of the quick release on the r134 valves.
On my way home, I stopped at a radiator & A/C shop and asked whether he had any suggestions. When he learned that I still had a threaded valve, he refused to touch it until it had been converted because he no longer disposes of r12 and he said there was no way of knowing what was in my car since the old valve was on it.
I got home and called the mechanic I have the invoice from, from the prior owner (it's far from me - so not an option to go to that mechanic). I told him I have his invoice which says r134 and told him about the valve and asked if their was a typo on the invoice or if he put r134 in. He insisted he put in r134 since it was in 2014. I asked how without a conversion and he told me that he has an adapter fitting which allowed him to recharge the old-style valve with r134. Overall, he sounded a little shady and didn't speak English that well, so I gave up on getting more info out of him.
I'd rather not pay for a conversion on a car this old and funds are tight now for me. So what do you guys think? Could it be true that it was never converted, yet filled with r134? If so, where can I get an adapter for the fitting to put r134 in the old valves?
Or, do you think it still could have some r12 in there? How do I get mechanics to work on it if they are afraid that it has r12 in it?