The outside temp dropped to un der 95, so I went out to check out the AC. The compressor runs for 2 seconds, cycles off for 7 seconds, then back on for two, etc. The off cycle seems a little longer at higher RPMs ~2000, but the one cycle might be a bit shorter. The compressor never ran long enough to read the pressures. WTF ???
On Wed, Aug 11, 2010 at 6:51 PM, Rich Thomas < [email protected]> wrote: > You can get a recharge can with a gauge at the auto parts for not much > ($15-20 if that much), it has pressure zones to show you where it is (and > some numbers too). I would get that and put it on the low side with the MAX > setting on the control to make the compressor run (watch to see if the > clutch engages), rev it up a bit (like 1500-2000rpm) and see if it drops > down too much, or starts sucking refrigerant. It might be something else, > but that is the first thing I would check. On my truck, the compressor will > not kick in when the ref is too low, or it will kick off and cycle until it > sucks in enough ref to get it to where it engages and stays engaged pretty > much constantly with the MAX settting and proper ref pressure. > > A real AC guy would probably say that is all FOS but it seems to work with > just the can gauge. > > --R > > > On 8/11/2010 6:26 PM, OK Don wrote: > >> I got some repair records with the car from the PO, who owned it for three >> years. She drove it 74,000 miles in those three years, and spent a little >> over $7,000 on repairs. Replaced items include: >> Radiator >> Fuel pump >> Expnsion tank >> Lateral acceleration sensor >> Locking system access module >> Battery >> Power steering pump >> Windshield >> Water pump >> Idler pulley >> Belt >> >> The AC was fine yesterday - it was blowing so cold that I had to turn it >> down - it was 102F outside, and the car had been sitting in the sun all >> day. >> Today, it barely cooled at all, and only when the car was moving. It ws >> like >> the compressor shut off when idling, and turned back on (most of the time) >> when moving - this was all driving in town, 40mph max. Might this be due >> to >> low R134a? >> >> >> >> > > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > -- OK Don 2001 ML320 1992 300D 2.5T 1991 300E 1990 300D 2.5T _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
