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A/C Compressor won't stay running
Posted 09 June 2004 - 05:43 PM
Posted 09 June 2004 - 11:03 PM
there are a couple things to check:
-if your compressor was off, then as you charged half a can of r134 it turned on, then turned off after a minute, its probably because the initial pressure of the r134 entering was high enough to allow the compressor to run, but as it cycled through the compressor and all the lines the pressure got too low. Your system should take at least 2 12 oz cans of r134, maybe more...use the r134 with pag and sealer and all that already in it...it is crucial to get a gauge! dont want to over or undercharge!
-If that doesnt work, run a wire from your battery to the compressor and see if it stays on. if it doesnt, the clutch may be bad, if it does stay on, check the AC system switches, pressure, wiring etc
hope this helps,
Posted 10 June 2004 - 12:25 AM
I didn't use the 134 with the sealer/oil because i poured some PAG directly into the compressor and rec/dryer and also replaced all the o-rings in the system and there are no leaks...the system holds a vacuum nicely...
I'll try running a wire from the batt and see if it will charge...
Posted 10 June 2004 - 02:24 AM
use the r134 with pag and sealer and all that already in it..
pag oil good
sealer really bad
the sealers are ruining every thing from compressors to a/c machines. dealers will void any warranty on A/C components if the system has been contaminated with sealer. same goes for a/c machines. I recently attended a class on this and the only solution for a system with that sealer junk in it was to replace ALL the components it came in contact with.
Posted 10 June 2004 - 06:42 AM
Watching compressors lock up and explode is fun.
Posted 10 June 2004 - 09:24 AM
If you have a set of refrigeration gauges, connect to the high side as well. It sounds to me like the compressor is going off on high head pressure. There is a safety switch that will trip at about 350 psig. Normal operating is in the 200s but will change with load.
If you find that with only half a can its going off on high head, your metering device is probably plugged. I had this happen when a compressor went bad and metal pieces were migrating around the system and got stuck in the very small hole they use for refrig control.
To clean it out, I blew the line backward, from the low side connection, through the evaporator and metering device out the other side of the silver can gismo with the line disconnected after the can. With that disconnected you might want to do the other half of the system too to insure debris removal from that side. Now of course you'd blow this clean with some inert gas like nitrogen because letting refrigerant out is illegal and environmentally unfriendly.
If you do find alot of metal, which will be very shiny specs in the oil that is pushed out, you have a compressor thats failing and should be changed out.
Posted 10 June 2004 - 09:54 AM
Sounds like it may be possible that the high head safety switch is bad...does anyone know how to replace or test this?
Posted 10 June 2004 - 11:09 AM
The sensor is a 2 wire device located in the line going to the metering device. I think they are normally closed, opening on high pressure. Try a jumper wire between the 2 leads.
Posted 10 June 2004 - 11:47 AM
I don't have a high side guage, unfortunately.
Posted 10 June 2004 - 12:01 PM
On the Subarus I've dealt with, the metering device is located in or near the cylindrical component near the strut tower, passenger side, under hood. The line coming from the condenser (which is up by the radiator) should be a solid, possibly aluminum tube, and will run to the cylinder in question. Out the other side of the cylinder (which may be a refrigerant reservoir) is a smaller tube that leads through the firewall to the evaporator in the passenger compartment.
I think there should be a high pressure switch right near that, possibly just before the cylinder as the line approaches from the condenser. Its not very big and will have wires connected to it.
Posted 10 June 2004 - 12:26 PM
Btw, i connected the compressor directly to the batt with the a/c on and everything works great and i am able to finally put more 134 in.
Posted 10 June 2004 - 12:51 PM
Posted 10 June 2004 - 12:58 PM
To make your life alot easier, find someone who has a refrigeration manifold set so you can see the operating pressures of the system. Otherwise your flying blind.
Posted 10 June 2004 - 01:38 PM
Posted 10 June 2004 - 11:56 PM
Brake cleaner can be used to clean it out. A small amout of refrigerant oil poured in and worked around will keep the pump lubed long enough for the rest of the oil in the system to reach it.
Remember, vac it out for at least half an hour, preferably longer.
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