Question about 1999 GMC Suburban
The air coming through is the outside temperature
Here is what I know:
The ac is properly turned on - at least the switches are engaged and lit.
there is pressure in the system
I have topped off the 134a coolant with a kit from an auto parts store. It was not completely empty.
the compessor is turning and the clutch is turning- although the clutch stops and restarts occasionaly
all the fuses are ok
Thanks in advance fro your help.
Is 1 of the 2 AC (under the hood) lines cold? if so you may have a blend door problem, that door is in the dash air duct distribution system, it mixes are between the hot heater core and the cold AC evaporater core to give the set or desired air outlet temp, When you turn the defrost on does it blow hot/cold as the lever is moved back and forth? The compressor turning off and on is normal cycling of the system, when it reaches a preset pressure in the low side line, a pressure switch will open and compressor will "cycle off" when the press starts to rise to a preset limit the compressor will "cycle on" and so on. I assume you have an electric bled door, older cars and trucks use a cable operated mechanical door.
Posted on Jul 25, 2008
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