I just finished rebuilding the A/C on my '86 K5 Blazer. Switched to R134. I replaced all components. The condenser, and evaporator, are parallel design with noticeably more core surface area. I also switched to appropriate low pressure switch. I installed a variable orifice valve as well. Variable is supposed to improve low speed performance. Just fired it up yesterday. It was only about 70F outside. But the air was incredibly cold coming from the ducts. I wish I woulda stabbed a thermometer in there. We'll see how it does when it gets really hot out.
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