Probably your control valve in the water line, some of the Evans Tempcon valves have been known to fail and provide no heat or to much heat and the A/C can't keep up, especially when the factory installed the backwards. The heater is supplied by the engine cooling pump, there is no separate pump. I had some massive air leaks under the dash so that the heater could not keep up and I froze. I found the leaks when I had the dash apart to replace the TXV on the Heater/A/C box. I am betting a failed control valve.
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1995 Gulf Stream 34' Scenic Cruiser Diesel Pusher 8344WFD. Cummins 12 Valve 230 HP, Allison MD3060 World Tec II.
2019 Jeep Cherokee TrailHawk Elite,
Road Master Sterling All-Terrain Tow Bar,
Air Force One Brake System
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