Dave & Marjorie I hope this thread helps.
"I have just had my basement SCS air fixed and the solution may be important to someone.
The dual compressor unit was giving us trouble recently, not blowing as cold as the single front unit and the fan wouldn't turn off. I called my house ac service company and persuaded them to service my coach. The tech traced the problem back to a faulty thermostat. I told him I would order one and call him back for the install."
Link to Thread :
http://www.luxurycoachlifestyle.com/...-solution.html