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Old 02-29-2012, 09:03 PM
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ac prob

wondering if you guys would please steer me in the right direction I HAVE A 01 SUBURBAN WITH the 5.3 in it well the ac stopped working last summer since summer is around the corner im now trying to fix it the compressor does not engage any more so I jumped a hot wire to one of the wires going into the side of it well it then kicked in with cold air but only in the back no cold front ac I figure the high pressure switch is bad in the compressor but not for sure but id be happy to wire it on my on switch to save money would this be ok and wonder why the back is the only thing blowing cold air thanks so much if some one could help

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Old 02-29-2012, 09:57 PM
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Quote:
Originally Posted by bigburban
wondering if you guys would please steer me in the right direction I HAVE A 01 SUBURBAN WITH the 5.3 in it well the ac stopped working last summer since summer is around the corner im now trying to fix it the compressor does not engage any more so I jumped a hot wire to one of the wires going into the side of it well it then kicked in with cold air but only in the back no cold front ac I figure the high pressure switch is bad in the compressor but not for sure but id be happy to wire it on my on switch to save money would this be ok and wonder why the back is the only thing blowing cold air thanks so much if some one could help
Check the refrigerant charge/pressure first to see if it's within spec before replacing the pressure switch.

Not having cold air in the front could be a clogged expansion valve or orifice tube.
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Old 02-29-2012, 10:51 PM
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It isn't going to be a high pressure switch on the compressor but a low pressure in the system. It's normal to leak about 5oz of freon a year from compressor front seal. Try a jumper wire across the terminals in the plug of the low pressure swith on the Accumulator (big aluminum can)by the heater box that has the big hoses on it. See if the compressor locks in and runs. If so would bet the charge is low.
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Old 03-01-2012, 04:37 AM
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You can try adding some R134 from one of the parts store kits to see if you get enough pressure to let the low pressure switch kick it on. If it does turn out to be just low refrigerant pressure, you need to take in it for recharge and standard leak check. Losing a small amount of refrigerant over several years is normal.

Its hard to get the R134 amount right using just pressure gauges. The most reliable method is to evacuate all the R134 and pull vacuum for at least 30 minutes, and then let the machine put exactly the right amount back in.

Bruce
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Old 03-01-2012, 09:58 AM
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All of the gentlemen above are correct with their conclusions. One trick that will tell you if the refrig charge is close is to run the vehicle at 1500 rpm with a large fan blowing across the condenser and grab the top and bottom of the accumulator. If the system is full and working properly the temp will be the same top and bottom
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Old 03-01-2012, 10:30 AM
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Quote:
Its hard to get the R134 amount right using just pressure gauges. The most reliable method is to evacuate all the R134 and pull vacuum for at least 30 minutes, and then let the machine put exactly the right amount back in.

Bruce
Bruce, The only reason you would have to discharge and evacuate would be if you were fixing an obvious leak. The gauges are what you got by with the pressure relation of the ambient temp in front of the condenser to the high side pressure at 2000 RPM. The fill from the factory is a mid range fill for all climates so the pressure will be different from Alaska to California summers. Also different winter to summer.Best to test with gauges in hot summer.
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