Thank you Al9 for advancing my learning curve. I also learned recently about about (Variable Orifice Tubes) and installed one with good success. Now my R4 doesn't try to lock up once in awhile like it used to and maintains steady gauge readings. For now, I backed off of the rear AC system idea and d...

This last attempt to explain is just the diagram I needed to go forward with my project. I thank you for that. I understand that the rear is normally a TXV. I was just curious as to why two orifice tubes in the system wouldn't have the same results. thank you

A little history: This is a 1993 Chevy engine and ac system that I merged into the 1986 motorhome. I removed the original drier and TXV from the stock system and plumbed in an accumulator and orfice tube. The system has been working ok. Now that I want to add a rear ac system, I'm a little confused ...

Thanks (V8Power) for giving me confidence in the R4 and (Cusser) for reminding me of the difference between series and parallel. And (Tim) I don't know if it would be ok to have two different types of expansion valves in the same system, or is that how they are normally set up, that I don't know ?? ...

I have a 1986 33 foot motorhome with a 454 and the compressor is an R4. I would like to add a second evaporator midway in the coach for additional cooling. I would like it to work as one system whenever my front ac is turned on. 1: Will I need two orfice tubes or can I run both evaporators in series...