Have a 23-year old Canadian Frigidaire refrigerator (Model #TD173CRD3) that really hasn't given me much trouble over the years - defrost drain has been plugged for 3 or 4 years (water runs down inside back and we 'mop up' every 3 or 4 days - couldn't figure out how to remove bottom of freezer to unclog); replaced defrost timer about a year ago. About 3 weeks ago, noticed fridge and freezer both warmer than normal. checked around and 'discovered' that the cooling control in the fridge was set at the lowest setting of '1' (don't really know what it was before but am guessing that someone inadvertently changed/lowered setting while placing stacked yogourt containers adjacent to the control wheel). Raised it to mid-range ('5') and found that that cooled down the fridge section further. Temperature in freezer didn't seem to get colder (cold control was always set at 7 (max is '9'). Over the past 2 weeks or so, have been adjusting the cold control (7 -> 8 -> 9) and fridge setting (1 -> 3.5 -> 4.5 -> 5 -> 5.5 -> 6 -> 6.5 -> 7). After this made things somewhat better (ice cubes freezing somewhat faster but not all items in freezer frozen) but still didn't get me back to where I wanted to be.
I pulled the fridge out from the wall, vacuumed the condenser (no fan) and felt the compressor (it seemed quite hot to the touch). No ice build-up on filter-dryer. Evaporator fan runs all the time except when the defrost cycle is on (its definitely running and not iced up but could it be running slower than normal?). There are some 'vents' in the floor of the freezer at the front that have various foodstuff bits fallen into them over the years although they are NOT plugged (I would clean out but same reason as with the plugged drain).
Defrost cycle drain water is still accumulating in bottom of fridge (perhaps somewhat more slowly). Am now finding water (<1/2 thimblefull) on fridge door top (just below the freezer door) at non-hinge side and water on floor below hinge (<1 thimblefull). Can't really figure this one out. The fridge/freezer is 'sort-of working' ('cool' instead of 'cold') seemingly indicating that no component has failed but the things that would seem to determine the level of performance (condenser cleanliness, control settings, door seals) appear 'normal'. Please help.