Re: Aircon surging on EL
The fault that I had was the TX valve had a bit of dirt in it, and it was not letting the valve work properly. The A/C would work, then switch off, then work, then switch off etc, all within a few moments. It would stay cool but not real cold. The TX valve is easy to replace, as I said, and surprisingly inexpensive. Without the labour component of course. Other considerations could be your dryer. These actually need to be replaced every few years, otherwise they clog up with crap, and don't work. These doohickies "dry" the aircon fluid, as the name suggests. Again, surprisingly inexpensive and easy to replace, but again the system will need regassing.
There is one fault with the original A/C pump on the EF/ELs. It tends to destroy itself. In order for this not to happen, one needs to run the A/C for at least 20 mins or so once a week. This keeps the bearings lubricated and the seals lubricated too. The A/C is a very effective demister, as it drys out the air in the cabin.