[A/S] Another A/C question

[Jeffrey Stoecker <stoecker@xxxxxxxx>]

I have a '69 Overlander with a newer Coleman Mach 3 roof air unit.  It went out 
yesterday.  When I switch over to A/C there isn't any hint of the compressor 
trying to kick-in at all.  The fan is all that is working.

I talked to a local RV repair shop that is authorized to repair/sell Coleman.  
They said the compressor is probably "cooked" because I was using an extension 
cord.  I question whether this is the case, since I used the roof air with this 
heavy RV cord all last summer with no problems.  The service guy said I had 
probably just "lucked out" last summer.

Do you think I should bother trying a new relay board ($85) and/or thermostat, 
or just get a new unit?

If I do get a new A/C, would one of the newer models with a lower amp draw, like 
the Coleman Mach III Power Saver, be less prone to damage when used with an RV 
extension cord?

Thanks in advance,
Jeff Stoecker