I had to pull the heater core assembly on my 289D to have a leak repaired. The manual states that anytime the refrigerant system has been open to outside air for more than 30 minutes unplugged that the receiver dryer has to be replaced. I can not for the life of me find the part number for this. Also I can not find the A/C refrigerant capacity anywhere. Anyone have any experience with this? Serial is TAW01709
Part number 186-6190 holds 2.2 pounds me personally I wouldn't change the dryer if the lines where well caped when disassembled. But ther you go