I have a 87 190 Dt. I've read several post after the fact about not converting to R-134.

My problem is that it only cools when the vehicle is moving or at high rpms; once you slow down it quits. Is this from changing to R-134? The compressor is running the whole time.

Has anyone converted back to R-12. I used a DIY kit that said the R-12 and R-134 oils could mix. Will it work going back to R-12?

Any help is appreciated. Thanks!!!

Your description indicates that the system is possibly improperly charged.

The kits are bad news. On the automotive a/c sites they call them "death kits."

I have reverse converted one system. You must disconnect and thoroughly flush EVERYTHING, replace the filter drie, put in the correct amount of mineral oil, evacuate and charge.

Good luck,

I had a similar problem with my C220, the AC would only cool when the car was moving. Pressure in the system was fine, all it needed was a new expansion valve. Works great now. Hope this helps.

Thanks, that is good to know, I was going to pick one up for my sorta working A/C in the 190D.

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1986 190D, 2.5L, 5-speed swap, 180,000 Miles (60K by me).
Jeep CJ-7 with Cummins 4BT/NV4500/AtlastII 4.3.
Grand Wagoneer 4BT project in progress!