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Junior Member
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Feb 20, 2009, 04:26 PM
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Originally Posted by Jlesnik33
all systems leak over a period of time but if they are in good condition they should only leak about half a pound per year and the most common place for leaks is at the compressor hose connections the best way to test for leaks is with an electronic leak detector. you also said it wont engage if it has low pressure so that can be bad high and low pressure cutoff switches
Lots of potential problems here... :(
But I'm hoping - and praying - for a simple solution.
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Junior Member
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Feb 20, 2009, 04:33 PM
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Max. charge is 19.4 oz. Sounds reasonable that it has all leaked out with age.
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Ultra Member
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Feb 20, 2009, 04:33 PM
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The clutch bearing goes bad, just like on a water pump or alternator.
I have to disagree with the statement that a system in good condition leaks half a pound a year. A system in good condition doesn't leak, period.
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Junior Member
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Feb 20, 2009, 04:35 PM
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Originally Posted by this8384
The clutch bearing goes bad, just like on a water pump or alternator.
I have to disagree with the statement that a system in good condition leaks half a pound a year. A system in good condition doesn't leak, period.
Is that the same bearing as the compressor bearing? I had one of those go bad on another car, it was obvious as it squealed full time - A/C on or off.
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Full Member
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Feb 20, 2009, 04:40 PM
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Well an easy way to check for leaks is to just look for oily residue on the system components and hoses but you said it kicks on but not under low pressure so it could either be the pulley that engages power from the engine to the compressor clutch. The pulley might be worn or it could be that the low pressure cut off switch could be bad and yes all air conditioning systems leak trace amounts of refridgerant with time
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Ultra Member
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Feb 20, 2009, 04:43 PM
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Are you referring to the pulley that sits on the compressor and the serpentine belt loops around? That doesn't have anything to do with "engaging power" from the engine. There's a switch that tells the clutch when to kick on and when to kick off.
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Full Member
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Feb 20, 2009, 04:44 PM
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The pulley could also have too much tension, which could cause the compressor clutch to stay disengaged
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Junior Member
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Feb 20, 2009, 04:44 PM
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She must be referring to the clutch - IDK how the pulley can go bad, unless it rusts away
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Full Member
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Feb 20, 2009, 04:45 PM
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Okay you have no idea what your talking about.
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Ultra Member
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Feb 20, 2009, 04:45 PM
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Originally Posted by Jlesnik33
the pulley could also have to much tension, which could cause the compressor clutch to stay disengaged
Um, no. Please explain how the pulley would magically begin to have too much tension on it.
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Junior Member
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Feb 20, 2009, 04:45 PM
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Originally Posted by Jlesnik33
the pulley could also have to much tension, which could cause the compressor clutch to stay disengaged
Tensioner indicator is within range, I replaced the serpentine belt about 20K miles ago
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Full Member
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Feb 20, 2009, 04:50 PM
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The clutch is driven by power from the engines crankshaft, which is transmitted though one or more belts to the pulley which is in operation whenever the engine is running. When the clutch is engaged power is transmitter from the pulley to the compressor shaft by the cluthe drive plate.
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Ultra Member
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Feb 20, 2009, 04:52 PM
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Originally Posted by Jlesnik33
The clutch is driven by power from the engines crankshaft, which is transmitted though one or more belts to the pulley which is in operation whenever the engine is running. When the clutch is engaged power is transmitter from the pulley to the compressor shaft by the cluthe drive plate.
Oh my lord... who have you been talking to? The crankshaft does NOT drive the A/C compressor or the clutch.
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Full Member
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Feb 20, 2009, 04:54 PM
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Actually who have you been talking to that you don't understand anything that I'm saying?
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Junior Member
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Feb 20, 2009, 05:00 PM
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Now, now...
The crank does drive the serpentine belt, which in turn drives the various accessories, including the A/C compressor.
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Full Member
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Feb 20, 2009, 05:07 PM
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Well the clutch is driven by the engine and the clutch transmits its power through the pulley which engages and disengages the compressor and when the compressor is disengaged the pulley free wheels and if your compressor sometimes kicks on the pulley may be worn, has too much tension or the clutch plate is malfunctioning and not engaging the compressor when necessary
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Full Member
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Feb 20, 2009, 05:13 PM
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It could also be an electrical problem because the clutch is designed to engage the pulley to the compressor shaft when the clutch coil is energized so if there is not enough current to energize the clutch coil the clutch will not engage the pulley to the compressor shaft and will not engage the compressor
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Junior Member
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Feb 20, 2009, 06:21 PM
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Thanks - that's also likely considering I live in Michigan (rust belt, thanks to road salt) and the location of the compressor right above the subframe. Meaning an electrical connection could be corroded.
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Full Member
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Feb 20, 2009, 09:17 PM
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No problem, and I'm sorry I was being mean its just I went to school for it and work in a business with my girlfriend as a side job, hope all goes well, and if you need anything else I'm here
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Junior Member
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Mar 5, 2009, 01:10 PM
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Update - took it to A/C guy, he evacuated, vacuumed, noticed and replaced a slightly leaky service port/valve on the low side, and refilled. With rides to and from work, $60.
Thanks everyone for your help.
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