Aloha All, registered just to inform all of a successfull TCA replacement. My wife's 02 Xterra SE Supercharged V6 Automatic , A/C quit, living here on the outer island of Lanai you don't have many options but to do repairs yourself or send it off island for repairs which is very spendy. Anyway delaying ( for like a year) what I thought would be a time consuming and expensive repair I decided to dig in and start my research on my system which led me here. Well first thing I did was determine if it was an intermittent condition and after just turning on and off A/C for about 10 minutes I was able to actually get it to turn on and blow cold air a few times. So without really any other diagnosis other than a visual check of all components I found the part online and ordered it from http://www.texasnissan.com. Ended up costing about $40 (everything costs more here due to shipping). It took about 1 1/2 hours to install, yeah I thought I would be smart and take some of the dash/console plastic off to gain better access, wrong don't do this, gained no better access and wasted an hour! it's just tight quarters and needs patience and small hands if possible. Well mahalo to all for info and pix!!

Well, I've got to say that yours is the newest vehicle that I've heard needing replaced. I can't believe how fast this winter went! Yesterday, here in Arizona, we hit the mid 90's already, and here I am again, just like I started last summer, with the AC coming and going.

I could buy and replace every part that has been suggested that "might" be the problem, and still come out ahead compared to taking it in the shop.

I ordered the ac relay yesterday, and Mon I'm biting the bullet for the amplifier. I'm curious, you said you paid $50 for the thermister type amp. Was what you got a tube that was attached to a circut board with a wire?

Meyerdel--I was rather surprised, too.  Could have been a manufacturing defect--my first guess is that the thermister had out of tolerance resistance based on the temperature and the computer had trouble making the adjustments.  I also went ahead and changed the cabin filters to make sure plenty of air was flowing through.  The thermister is a pretty basic part.  Here is a link to show you what it looks like--a bit different than the older designs through 2004.

http://www.courtesyparts.com/27723n-sensor-assy-thermister-f rontier-d40-2005-2008-cyl-auto-air-cond-2009-2010-auto-air-c ond-2010-p-612883.html

Hope that helps.

http://www.courtesyparts.com/27723n-sensor-assy-thermister-f %20rontier-d40-2005-2008-cyl-auto-air-cond-2009-2010-auto-ai r-c%20ond-2010-p-612883.html

lakota