The air con in the Focus is pretty average too....my XR5 air con is not cool enough really for AUS Climate.....but the Heater would melt an igloo about 20 seconds after I start the car in 3 deg temps...I'd suggest it's a lot to do with the climate the cars are designed for....but I may be wrong....maybe speak to an air con specialist??
As far as the engine noise, I wouldn't be confident without hearing it, commenting on it...
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