Date: Thu, 19 Aug 2004 07:44:50 -0400 From: KeithG <noonenospamay.com> Subject: Re: AC Advice
Has the manifold hose been replaced? Is the fitting on the low pressure hose wet with oil? This is a common leak point. If so replace the manifold hose. How about the input shaft? Is it wet with oil behind the pulley? This is the other common leak point. Replace the compressor. At this point, it would be best to open the system, drain all oil out of the compressor and dryer (gravity drain) and flush the condenser and evap with mineral spirits. Refill with oil, evacuate the air/water and charge it properly. Other leak points could be the hard line fittings. These are sealed with o-rings. If any are wet with oil, these need to be opened and the o-ring replaced. Sometimes, the leak is in the evaporator or even the condenser (usually caused by impact or salt corrosion). Good luck! KeithG Mark wrote: > I have a 91 900S and the air conditioner isn't working. It has a > history of me taking it to the shop, them looking for leaks, not > finding any and then charging the system. The AC works for most of > the summer and then it peters out and stops working. So clearly there > is a leak. > > This time I decided I'd just buy a recharge kit from the store and do > it myself. The system has already been refit for 134-A. When I > attached the gauge to fill it the reading was low (about 15 psi I > believe). I followed the directions and charged it to about 40 psi. > It didn't take very much, only a fraction of a can. But the > compressor still does not come on when I hit the AC switch. > > I know that there are a couple of sensors that can prevent the > compressor from running. What I find strange is that it took so > little refrigerant to bring the pressure back up to the normal range. > I am guessing that this indicates that the system is not "open" and so > I'm only putting the gas into a very small volume. But I'm not sure > why this would be. Unless something is actually broken now and it > needs more than a recharge. > > I'm new to this AC repair business so I thought I would seek out other > people's experiences and suggestions. > > Thanks a lot, > Mark
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