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The only time i have encountered this problem it turned out to be a cracked fan wheel in the blower. fooled me until the fanwheel disengrated and locked up the blower motor.. could be trash in the blower too like leaves, plastic bag etc.
No that doesn't sound like the problem, the fan clutch locks up to cool the engine off due to the increased load of the AC system on the cooling system, so it locks up and gets much louder. If it didn't lock up the engine would overheat.
I do not think that the battery change and the noise for the a/c is related, probably just a coincidence.
If the a/c makes a loud noise when it is turned up, I would try switching to vent to see if the noise is still there. If it is, then it is the ventilation fan likely located on the firewall or under the dash under some plastic paneling.
1. Could be a caught foreign object between A/C (air conditioning) fan and cooling radiator, producing this loud noise. 2. Could be a damaged fan blade, mowing the cooling radiator. 3. Could be a loud noise comming from the fan's electrical motor. 4. Could be a broken off fin (small wing) of the cooling radiator, striking the A/C fan, producing this loud noise.
I might have a solution for you issue. First I would like to give you a few explanations.
1. If you live in an area with squirrels or chipmunks they could be the reason for the noise. If you hear a loud humming noise there is a simple fix. Just open the fan housing under the clove box and unscrew the housing and remove the acorns, Sticks, leaves or anything else that is stuck in the fan or its housing. These animals are notorious for hiding things in vehicles especially in the beginning of the colder season. I have to do this in October every year.
2. The bearings in the fan motor may need grease or even replacing. If bearings are burnt out they can also make noise.
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