Quote:
Originally Posted by Funny
Just so you guys are aware, the reason that the units are coupled is the A/C is never used during the winter, but the defroster is. The compressor will seize up if not used periodically, so the simplest solution to the problem of seizing was to have it run during the winter as well as the summer.
If you do this mod, make sure to run your A/C three or four times during the winter for about 3 minutes (no longer than that otherwise the system will freeze, it is recommended not to use the A/C below 60F because of that reason), because your defroster won't do it for you anymore.
Other than that good mod, I would like to see the MPG gain from this one.
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That's a myth. There is no reason why a compressor has to be used to keep it working. They easily sit unused for years in supply houses and work just fine when installed. In fact, operating a compressor without a crankcase heater when cold can cause valve damage from liquid refrigerant collecting in the cylinders.
The myth probably originated from the old days when the capacitors used with compressors would lose the dielectric layer when left unused. That results in catastrophic failure when it is later operated. However, modern capacitors don't have that problem, certainly not within a year.