cleaning ac

what is the best way to clean the coils on outside ac unit? it is a Trane XL1200 installed in 1989 and still runs ok.
do i need to remove the sides and/or the top to clean, or can i just hose it from the outside without removing any of the panels?
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stevie wrote:

I cleaned 2 that I bought and had to take the outer housing off. They were both less than a year old but it looked like they had pigeons nesting on them. The exterior exchanger had crap and feathers stuck in it. I used a very tight nozzle that I modded to make it even tighter. I used soapy water and a very stiff scrub brush. Both work great now. Richard
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A good sand blasting will do the trick. After you're done with that, make sure you change the thermostsat.
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Al Moran wrote:

is that an (unsuccessful) attempt at humor?
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Just put him in your kill file.
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those tranes you have to take the covers off to get at it good, it has the funky spikes on a pipe type fins..
http://www.minibite.com/america/malone.htm
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Couple different ways. Depending on the type of coils, you can use either a pressure washer (from the inside out) or coil cleaner. Wide angle fan spray does less damage to the coils. Straight stream bends the fins.
I know of three or more types of coil cleaner, different techs prefer different cleaners.
With any of the choices, you do have to take the covers off.
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