Originally Posted by powercat_ras
Did the Ford dealer tell you what fault code they read when you got the yellow check light? It could be something else besides a loose gas cap code. Personally I get the check light due to intermittent knock sensor faults.
FYI with engine off you can switch off the chassis battery disconnect switch and it will clear the fault light for certain faults if it is something like driving with gas cap off and you now have the gas cap back on again.
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The Dash Air is a Winnebago system not a Ford system so hopefully you did not try to get a Ford dealer to work on it. You may want to try a different Winnebago dealer or Winnebago Factory Service in Forest City while under warranty. It's not working as designed if the air does not change to outside ambient with system on vent with AC off and temp dial set to full cold when driving at speed. The air coming out the vents even with those settings will become warmer when engine is hot and you are stopped in traffic congestion, etc, as the air being pulled into the system from behind the front cap becomes hot due to the heat coming off the radiators. You just have to switch on the AC to compensate and sometimes even use Max AC to stop pulling in air from behind the cap and draw air from inside (Max AC draws air from the floor in front of the passenger seat).
The code for the engine is P0455 - Evaporative emission system leak detected.
This code only comes on after I get the "check gas cap" error message on the Ford display several times. I have can reset the "check gas cap" message using the Ford reset button. I also have a code reader so I can reset the check engine light if needed.
As far as the heat/ac issue I figured the same thing. I have had it at two different camping world winnebago dealers and no luck on getting it repaired. Each time they say there was a loose wire and "it is working as designed". Since I live in Virginia it is a long trip to get it fixed. I have a trip planned in June so I might just find a way to get it looked at when I pass close to Forest City.