Dash Air Conditioning

dougrainer wrote:

Groover wrote:
Automotive air conditioners use a cool-reheat system where the air is cooled by the air conditioner and then warmed to a comfortable temp if full cooling is not required. It can even be heated to an elevated temp for de-fogging the windshield. If the reheat function is not shutting off properly it can make your airconditioner useless. Turn your system to "Vent" and the temp all the way down and see if the output air is warmer than the air coming in. If so, you have a heater control problem. Some Fords have a valve in the hot water line supplying the heater that is supposed to shut when no heat is asked for. If that valve leaks your air will be warmed somewhat, how much depends on the leak rate. My father had a Ranger with that problem new. The dealer's mechanics had no clue how the system worked or what that valve did. He finally replaced the valve himself and solved the same symptons that you are describing.

Good Luck.

ALL CORRECT. BUT, NOT for RV motorhome systems. Motorhome systems have no such blend door system like Automotive systems. Yes, if the Hot water shut off is seeping or not closing, the AC will not cool but when that happens on a motorhome system, the air output will be over 100 degrees and higher. Doug

Doug,

The Denso AC/heater systems used by Fleetwood in the 90s and early 2000s is indeed a blend door system. No water control valve used. I have personally been inside said systems, replacing exp. valves and heater cores.
It is a much more robust system than used in small truck cabs.

Richard
95 Bounder