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Mostly filthy return air filter coils or inside fan motor failure of some sorts. Fan not blowing properly because of old slipping belt or motor overload from some source or reason. ( amprobe is nice to analyze this ).
Evaporator coils stopped up with stuff that has gotten by filter or filters or even inadequate filter size or restricted return air line going back to the unit where someone inadvertantly crawled over it doing other work in that area.
There is also the chance of Low refrigerant charge. Often A/C. Companies go straight to this one and dump some in.
Before calling in the calvary: think back!!!! hmmmmmmmm has someone been around return area duct that may have somehow smushed it. Is insulation on the inside or the outside and if on the inside could it have fallen loose and blocked return air? Then Third, Did you just install a new high efficiency super dooper filter system without expanding the pre-existing size of your return air inlet size?
Remember the more return area size for filtering the better in general. 600Feet Per Minute being optimum. If your hear that air gushing through their its over 1000 and it needs to be made bigger before you do squat especially if you have new fangled high efficiency filters.
Look at Indoor coild fan motor, if its dirty then you can bet the coild the filter is supposed to protect is filthy and needs a good cleaning to. While at cleen all outside coilds even if that means some dismantiling to do so. Be sue to cut off all power first.
Now your read to call the man with the gauges. Have him use electronic metering scales and write down before and after weights yourself. Also have him add Little Ritchie or Equivelant make Fluorescent Dye to help you find the leak in future so it can be fixed if it can't be readily found now.
Have your technician make sure the refrigerant in your system is pure by comparing its off pressrure reading after stabalizaion in off mode on both sides of system to the ambient air temperature.
If something else is in there other than what should be this will tell you pronto. Get it all out!!!!!!! immediately,,,,,, bad bad bad stuff..... to E.P.A. Recovery system in special tank it goes. Your technician will know the procedure.
Hope this helps: Jimiwane
What else can I help you with?
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