Lately at certain times while running for days it makes a clanking noise(sounds like the fan) I spray water through the back of it with a water bottle and after 20 min the sound slowly go's away.It is a 10,200 BTU window/thru the wall unit 115 v thank you

It sounds as if the belt is dry. Belts dry out after a certain amount of time and then start to make chirping noises. If the belt is not badly cracked, you can try using a belt lubricant spray. These sprays usually only last for a short period of time, though.

this does sound like theres a loose line tapping the engine/frame,during warm up the engine idles faster which could make it vibrate faster causing the the clanking or tapping noise,if this has started after trans fluid change,then check the lines running from the trani to radiator sometimes the service person might bang into something causing plastic clips that hold the lines to break,try getting under it and have someone start the truck and listen to see where it's coming from also hold the lines & see if the noise stops,the service guy could have unbolted something & never put the bolt back causing the clank ex.line may have a clip holding it thats bolted to the trani pan ?good luck

Diesel or Petrol?

Any warning lights on on the dash?

Oil pump working ok?
Check your timing belt?

This could be caused by different things. It sounds like it may be your timing belt though. If you remove your drive belts (alternator, power steering and air conditioner belts), and then restart the vehicle, if the noise stops, then spin the pulleys you just removed the belts from, to see which one is making the noise. If the noise does not stop, then it is most likely the timing belt tensioner making all that noise and you will need to have the timing belt and associated parts, idler pulley/s, tensioner, water pump and seals replaced. Hope this helps. Have a nice day :O)

Problems not related.  The first is most likely the fan, or possibly water dripping on to the fan and freezing, but usually the noise comes from the fan struggling to run.  The cube problem could be as simple as the ice dispenser being put back in wrong.  There is a metal lever under the ice tray that switches between crushed and cubed.  Make sure it is seated properly.

chances of a critter in the fan? Like a dead 4 legged critter?

The best way I have found to locate a belt noise is to take a can of WD40 and spray it on the belt when the engine is running. (be careful of the fan) If the noise goes away, you know that it is a belt noise and not a bearing. When serpentine belts dry out they make funny noises. Hope this helps, cheers

Most likely the motor as food caught in the sump would not make a noise you described.

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take raer panel off inside freezer and check there is no ice build up which is hitting the fan

Does water drains out properly ?