In July 2012, a posting addressing the AC in a CADDY with 1.9TD AAZ mentioned two factors using the AAZ with Serpentine in a Caddy.
Issue 1. AC pump hits the front radiator support. The topic starter indicated he cut and re-inforced the radiator support to make room for the pump. I have done the same, and it fits great and I simply love the serpentine belt for alternator over V-Bellt. No issue there.
Issue 2. Lower radiator hose hits AC pump. Topic starter found no resolution yet. He is looking for a RADIATOR to accomodate AAZ AC.
I found that a Griffin Race Radiator for a Scirroco fits, and it has the bottom radiator hose on the left side under the battery. The upper radiator hose is on top right. The Griffin radiator is a two row radiator which is much THICKER than OEM radiators. All aluminum. Has bottom ears which can be drilled and screw inserted into radator support. I cut the stock radiator shroud down and brazed it to fit. With POR15, it looks awesome. It has two glitches in use. The top left hole for the radiator fan switch is 1/2"-14 thread. Initially I used a 10mm 184 degree two prong switch and adapter, which works, but is about 15 degrees too hot and too late for good use. But really, with a radiator as large as the Griffin, it was hardly even needed.
One of my reasons to upgrade to a larger radiator is "I'm fine to 70mph, but 75-80mph, running with traffic on freeway, I got warm with OEM radiator AND DESIRE AC ! So I wanted more cooling. With a 184 degree switch, the fan rarely comes on and the radiator fits and looks awesome - just HUGE until you run fast or want AC.
So I ordered a "Derale 16749 Adjustable Fan Control Thermostat (Thread-in probe)" which has a 1/2"-14 probe, and is adjustable from 150-240 degree. I consider this problem closed.
New Issue: I used a long raditor hose to route the coolant back to the starter and to the L/S lower radiator. Temp solution. Next I will fabricate a mandrel bent pipe that has brackets to bolt to engine/transimission. After 14k use and one oil change, I now have all the info to build the pipe. One of two methods. Either I will replace the lower waterpump elbow, or I will s-curve the pipe to be a solid connection, as the pipe will be firmly fixed and bracketed to engine, and the flex end will be under the battery. Will posted when finished.
But here is my problem. I have a stock AAZ VW Sanden style pump. I originally planned to use a steel line set off of a 190D mercedes. They may not fit. I prefer steel AC fittings over aluminum. Where can I get steel fittings that I can braze onto my existing hoses?
Wayne
South Central Virginia
original July 2012 posting.
http://www.vwdiesel.net/forum/index.php?topic=31746.0Griffin Radiator 2-26185-H 22" x 13" Scirocco Race Radiator
http://www.amazon.com/Griffin-Radiator-2-26185-H-Scirocco-Race/dp/B007N0KI4SPrice: $211.00 & FREE Super Saver Shipping