I have a 94 with no ac and any time I check mine with the on off method I get the AC one also... I also get another one, but I cant remember what it was, but it was also something that I didnt even have... I was told that the computer on the 94 and 95 jeep was set up as if you had all of the options (I wanna say it is the same as the cherokee) IE a/c ext, and that those codes will always come up with the on off method... These codes will not cause the check engine light to stay on or even come on though... You may actually want to buy the scanner or go and get it check.. I want to say that autozone had a thing going for a while where they would run it for free... you may want to try that... But hey... if it is running ok, then dont worry about it... My wife has a 99 Isuzu trooper and if she forgets to tighten the gas cap till it clicks then she gets a light... heck the light on that thing comes on all the time for no good reason... Its just another way for the dealers to make some cash...