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Thanks jnaten. I took it to the dealer and even though my year and model was not one listed as having the short fill problem, the dealer checked it and found that it was indeed short. No leaks, supposedly, but short from the factory. They refilled it to the proper amount and it is indeed colder now. It still does not match my 89 f150, but they said that these new trucks will never be as cold as the old ones and that in warm weather, you will have to use the max setting. (I never used the max setting on my 89). If it holds where it is now over time (44-46 degrees), I can live with it.
Finally a post that I can shed some light on. I have been in the refrigeration business for 35 years, and I can tell you without a doubt that R134A takes longer to cool. If you sit for very long at idle it will warm up on you. By the time you get to the next traffic light, it begins to cool, then you stop and start the same thing over again. It isn't just Ford's problem, all R134A systems suffer the same thing, including new home refrigerators. If you keep the RPMs up it works better...around a 2000 rpm idle, but that's hardly practical. Mine works pretty well because I live in the Seattle area and don't use it much, but went to Phoenix this summer to visit inlaws and had the same problem. My '99 Chevy Denali did the same thing.