How will I charge freon on kenmore 994671

If the front blows cold it would suggest that the freon level is ok. However, if the freon is low, it still may blow somewhat cold in the front and less adequate in the back. Have you had the pressures checked to verify the charge is ok? Does the rear fan motor work? There also may be a restriction or defective expansion valve in the rear causing little/no freon circulation. Another problem could be a defective/stuck blend door in the rear causing the cold air to not circulate

Low of freon, have it charged to proper lvls with CORRECT freon/refridgerant

do you have to recharge it after it starts blown warm if so its just got a leak and leaking all your freon out if its holding all freon then compressor must be bad

check the freon charge for the a/c system to low can shut off the cutch

mcdevito75 here, It can also be the need for a charge of freon gas, se your local auto repair shop for this re-charge.

Most likely your problem is the same as mine, which means you have a crack in your air compressor therefore no matter how full you fill the freon it will always drain (or blow) right out. Solution - get a new air compressor. Try to find one in a chop shop junk yard type place if you can do it yourself.

Alternate problem - freon can lose its charge. You can take it to just about any auto store and get the freon charged up for about $70. If that doesn't fix the problem it is likely the compressor.

you can try recharging the system...it's a fairly simple process and freon can be purchased at any parts store. here is an overview:
http://www.aa1car.com/library/ac_recharging.htm

problem with blend door either stuck or linkage problem

needs freon. valve must be installed on unit in order to charge. if you know nothig about freon, call a repairman. Check craigslist.com

I had same problem on 2000 Lesabre blowing cold on passenger and warm on driver. I fixed it by adding more freon even though it had 28 pounds of preasure. Now it works great!