Revisiting an old thread to offer details on A/C replacement. I replace my compressor because it was periodically squealing.
Denso 471-1426 worked for me. Ordered from Amazon. The pulley is 16% larger, but the body is a perfect fit to the 2ZZ-GE engine.
Replacing the compressor probably took me 4 hours on an Exige S. M
I believe I did everything from underneath the car. Like most bits on the 111R, much time is spent fiddling with hard to access bolts.
Unlike a previous post, I found that my belt did NOT fit after installing the new Denso compressor given the larger pulley.
I purchased a 16mm longer belt (Gates K060764) which fit and still left plenty of compression in the tensioner.
I also replaced the drier since the system was opened. This requires removing the front clam.
So altogether, there's a lot of labor in this job to do it properly, replacing compressor and drier. Maybe 10 to 12 hours...and as long as you are in there with the drier, you should address the blower motor resistors and low quality blower electrical connector.
I am getting 48 F from the vents on a 72 F ambient sunny day.
'07 Lotus Exige S - Chili Red