AC compressor bracket broke, letting compressor drop down a bit, still working even with loose belts; alternator not charging is what caught my attention. When cause was discovered, vibration had rubbed a hole near bottom of AC compressor base, oil leaking out slowly. Replaced compressor, drier/filter, expansion valve, pulled vacuum and recharged. Low pressure = 25-28 #; high side reading about 250# this is with engine fan on manual, cab and sleeper units both on. 48* out of center vent on dash.
What has me concerned is suction line constant sweating at fittings on expansion valve and compressor, don't remember this before, but maybe I overlooked it. Wiping the suction line dry at compressor will cause icing immediately, til sweating takes over. Not an AC tech, and wondering if this is normal, or do I have a problem. Remember long ago, there was a "rule" you could go by, when troubleshooting, something about one side (suction/discharge) being hot to touch meant blockage and icing up was also a telltale sign, but thats all I remember. any advice, or direction to a good AC troubleshooting site would be appreciated.
W900....AC normal?
Discussion in 'Trucks [ Eighteen Wheelers ]' started by droy, Aug 17, 2010.
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IIRC, 6 cans R134, new compressor was pre charged with oil, no more added. Did all work myself, but having the equipment to do the job sure doesn't qualify me as a tech! Couldn't find sticker displaying required amount of R 134; was told 4 cans by one person, 5 by another, 6 by still another.
Good points, did a "halfassed" wash job on radiator, charge air, and condenser awhile back when truck was running hotter than usual, made a mental note to give it a thorough cleaning when we slowed down, but I have been known to lie even to myself.
2004 W900 not a grilldensor.
Thanks to all for the pointers. -
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my 99 W900 takes 4lbs of freon.
The suction lines sweat like a pig...drip all over. I wrapped them in that pipe foam you use on hot water tanks.
40F out the vents in the cab and 50f out the vents in the sleeper.
Hope that helps. My AC is very cold. Should be after spending $1800 to fix it.
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