PLEASE HELP ME WITH hotpoint ff92s fridge temp problem

I HAVE A 6 YEAR OLD FF92S AND I WOULD LIKE TO KNOW WHICH PARTS I NEED TO FIX MY PROBLEM. I HAVE READ THE FORUM ON THE TEMP PROBLEMS ON THE FF92 AND THINK I NEED A THERMISTOR OR THERMISTORS.
THIS IS THE PROBLEM FRIDGE TEMP WAS AT ROOM TEMP +19, FREEZER AT -22. DEFROSTED FREEZER EVERYTHING OK FOR A MONTH, BUT IN THIS TIME THE FRIDGE TEMP WOULD RISE TO +14 AND THEN FALL TO +3 SEVERAL TIMES A DAY, THEN IT WENT TO +19 AGAIN AND DID NOT FALL.
CHECKED TO SEE IF IT NEEDED DEFROSTING AGAIN BUT ALL WAS OK.
CHECKED TO SEE IF THE BAFFEL HAD STUCK BUT THAT SEEMED TO BE WORKING OK AND A COOL AIR FLOW COULD BE FELT COMMING OUT OF THE VENT IN THE FRIDGE.PUT IT ALL BACK IN PLACE STILL HAD SAME PROBLEM.
REMOVED BAFFEL AND POLY HOUSING FROM PLASTIC VENT COVER, BUT KEPT IT CONNECTED TO WIRING TO CHECK IT WAS WORKING EVERYTHING OK. REPLACED PLASTIC VENT COVER WITH BAFFEL STILL OUT SIDE OF VENT COVER AND TEMP RETURNED TO NORMAL.
HAD IDEAR TO REMOVE BAFFEL FLAP SO THE COOL AIR FLOW COULD NOT BE CUT OFF AND I WOULD BE ABLE TO RETURN THE BAFFEL AND POLY HOUSING BACK INTO THE VENT COVER INSTEAD OF IT HANGING IN THE FRIDGE, WHICH I DID BUT THIS RESULTED IN THE PROBLEM RETURNING. SO I HAVE NOW LEFT IT OUTSIDE OF THE VENT COVER AGAIN SO I GET A COOL FRIDGE.
I KNOW THE COOLING FAN SWITHCES OFF WHEN THE FRIDGE GETS TO THE RIGHT TEMP +3 AND THE BAFFEL CLOSES.
I CHECKED THE COOLING FAN AND THAT TURNING AND SEEMS AT FULL SPEED, BUT IT CAN BE STOPED WITH THE FINGER AND A SMALL AMOUNT OF RESISTANCE CAN BE FELT WHEN YOU DO THIS. I CHECKED THIS AS I THOUGHT IT COULD HAVE BEEN THE FAN ON ITS WAY OUT AND NOT BEING STRONG ENOUTH TO PUSH THE COOL AIR THROUGH THE SMALLER OPENING WHEN THE BAFFEL WAS IN THE VENT COVER BUT WAS STRONG ENOUTH WHEN IT HAD A MORE UNRESTRICTED PATH.
I HAVE CHECKED THE DEFROST HEATER AND THIS WORKES.
THE ONLY ERROR MESSAGE I HAVE HAD WAS THE ONE I GOT WHEN I DISCONECTED THE BAFFEL FROM THE WIRING.
ALL DISCONECTIONS AND DISMANTMENTS WERE DONE WITH THE FF92S UNPLUGED AND THEN PLUGED BACK IN TO WATCH THE OPPERATION OF THE COMPONENTS.
SO DO I NEED A NEW COOLING FAN OR JUST THE FRIDGE THERMISTOR OR ALL THE THERMISTORS. IF ITS THE THERMISTORS WHAT ARE THE PART NUMBERS AS I READ THAT THERE COULD BE ONE OF TWO FOR THE FRIDGE ONE DEPENDING ON THE DATE CODE.
BY THE WAY THE DATE ON THE COOLING FAN IS 31.7.01

THANKS RUSS