Several different manufacturers making custom fit units now that are sized for a particular vehicle. Most of these use an electronic water control valve, so you can actually adjust the temperature. They're nice, but expensive. Electronic controls are also available on some universal (less expensive) units. Efficiency depends upon matching size of unit to area being heated/cooled. Confused yet? Frank
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72 Cheyenne SWB Fleet/original 402, TH400, buckets & console
65 C10, 350TBI, 700R4 (work in progress)
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