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Re: AC makes churning sound
When you shut off the engine with the A/C still on, there is a pressure difference still present between the high and low sides. The hissing/gurgling sounds are just the refrigerant continuing to flow into the evaporator to even out the system pressure.
Personally, I like to shut the A/C off before I shut the engine off, but I haven't heard of any damage done by leaving it on. Most new vehicles keep the A/C clutch disengaged until after the engine is re-started, lessening the load on the starter.
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Current Garage:
2009 Honda CR-V EX
2006 Mazda 3i
2004 Chevrolet Silverado 2500HD
2003 GMC Envoy XL
2000 Honda ST1100
2000 Pontiac Sunfire
Vehicle History:
2003 Pontiac Vibe AWD - 1999 Acura Integra GS - 2004 4.7L Dakota Quad Cab 4x4 - 1996 GMC Jimmy 4wd - 1995 Chevrolet C2500 - 1992 Toyota Camry LE 2.2L - 1992 Chevrolet S10 Ext. Cab 4.3L - 1995 Honda ST1100 - 1980 Yamaha XS400 - 1980 Mercury Bobcat.
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