FRONT A/C ON 97 GMC SUBURBAN WORKS FINE REAR DOSE NOT BLOW COLD

SOURCE: Rear a/c not blowing cold, front works fine.

you may not have enough refrigerant. a low charge can cause the rear in this dual system to not work for beans. charge with a can of uv and find the leak. fix the leak. evac the system and recharge. i think you take 4 lbs, but check the accumulator sticker. you may want to just change the accum at the same time.

SOURCE: Rear a/c not blowing cold, front works fine.

probably the same problem as the '99. you probably lost too much coolant. charge with dye and check for leaks, (these things lose refrigerant normally, so you may not have a bonafide leak but check anyway) change the accumulator as a matter of course. evac the system and make sure you lose no vac over the course of 5 to 10 min. recharge the system for the proper weight (which is on the accum sticker) if you need detailed instructions let me know.

SOURCE: 1999 CHEVY SUBURBAN.A/C BLOWS FINE ON ALL

IT IS PROBLABY CLOGGED WITH SOMETHING TRY TAKING THE COVER OFF AND CHECKK IT.

SOURCE: 1999 Suburban, A/C on warm air from front vents, cold air in rear

The car uses the same freon in the front as it does in the rear. If the rear a/c is working, you either have a plugged evaporator in the front unit, or perhaps a bad heater switch. Try switching the heater to hot and see if it blows even warmer air from the front vents. If so, the heater switch is working and then it sounds like a plugged evaporator or maybe a plugged orifice tube. That is a good place to start looking. Hope this helps.

SOURCE: rear a/c not working in suburban blows cold in

If rear a/c blower motor working but just not cold, it's going to be a clog expansion valve for the back unit, if not blowing air bad blower motor.