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Message: <blockquote data-quote="uncltrvlnmatt" data-source="post: 766423" data-attributes="member: 8290">I used to work on trucks, and they did not have orifices, they have expansion valves by the firewall. So they have thermostats in the system to measure temp of the evaporator. I have never worked on a/c on cars other than a quick charge here and there.That is why I never wanted to work on cars. Your tech book is 40 pages. The one I had from Bendix for Mack trucks is 10-15 pages. Of course that was 15 years ago. I have done no a/c work in 10 years. So I am sure things have changed.</blockquote>