Brookspw
Don't you hate it when someone asks if they can use mazola oil in their diesel and they get 100 replies.....

My son has my 190E 2.6, or I would look. I know that when I converted it to 134 I did not bother to replace the high side fitting because it was too inaccessible.

As I recall I changed the low side to the new fitting and sucked it down, refilling it until the sight glass ran clear.

This is not much of an answer, but mine has been cold for 2 years since converting to 134.
I may have come up from underneath to connect to the high side. Also I bought another set of gauges and just swap the one hose to use them on this car.

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Jeff

97 E320, ours 217,000miles
91 190E 2.6 daily driver 242,000miles
74 MGB,mine 120,000?
2006 BE350/Proline 21, 50 hours