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post #9 of (permalink) Old 14th August 2007
Technical Supremo

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Hi Craigie - the condensor is behind the radiator grill and close to the radiator but the evaporator is situated inside the heater unit inside the car which has a drainhole to the underside of the car. Condensors don't generate moisture but evaporators do. An air-con system wprks on the same principle as a fridge and disipates heat whereas the condensor is at the back of the fridge but the evaporator is inside - and guess what the water on it tends to freeze up simply because it doesn't always get a chance to reach the drainhole in the bottom. Apart from cooling the interior of the car the other main benefit of air-con is that it delivers dry air to the windscreen making for faster demisting.
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