Engine Size: 4.0
Refrigerant Type: R134
Country of Origin: United States
I posted a topic a couple of days ago on my a/c, and to make a long story short, my system was overcharged, I purged some refrigerant by mistake and the system ended up freezing at 104 degree weather ..what more could I ask for,right?
Well, not quite. When the a/c had been cooling poorly, I had ordered a high pressure cut of switch, which goes on a line in my system, thinking that was the problem, which it was not
So seeing that I had this new part, I thought that I would install it......unless it meant I had mess with refrigerant charges since it was cooling so well......So I looked in my shop manual for my car and it said that the high pressure valve screwed on to a schrader valve, so no refrigerant would be lost if replaced, so I unscrewed it and...well all the refrigerant purged out.....there was no schrader valve. The manual was wrong..
So right after the cloud of refrigerant stopped I screwed the new high pressure switch on but of course there is no refrigerant in it now.
Should I assume I lost all the oil in the system???
Did you see a lot of oil release as you unscrewed the old switch? Evacuate and recharge sounds like the next step.
No I did not notice oil and as a matter of fact none of the areas that the refrigerant blew on where coated on oil . But all the refrigerant did blow out. I am going to have it evacuated tomorrow and intend to recharge it myself. I imagine since it did not blow out due to a leak there is no need to replace the drier. (its only a month old anyway). Seeing that all the refrigerant gushed out, how much oil should I add??
Edited: Sun August 21, 2011 at 1:33 AM by Spikepaga
Don't add any oil since there isn't evidence of losing a significant amount.
An evacuate and charge should be done in the same session. Do not disconnect the manifold hoses from a car while it is under vacuum. That is because the shrader valves aren't designed to hold a vacuum, so air is likely to get in.
Ok thanks. Does unscrewing the swithc and screwing a new one constitute an "open" ystem...should I replace the dryer?
It is rare that a system wouldn't need to be discharged when servicing a high side switch, most do not have Schrader valves on the high side.
Why replace the switch for no reason? Why not just test it? All you needed to do was cover the condenser, watch the gauges, and if the system cuts out at the specified pressure, it's fine and leave it alone!
Unless you were flushing the system to get a a "dry" system, I wouldn't replace the dryer even if the system was opened - no need - the dryer is new.
Well, because I had already ordered the switch thinking that was my problem before. (It was not, it was an overcharged system) and I figured it would be good to install the new part instead of just having it laying around. In addition to that, the service manual said that for my vin range it was not necessary to evacuate the system to replace the high pressure switch. t was wrong.
I took the car to get evacuated and vacummed and recharged. I added 2oz of oil. Its cooling, but not as well as before....
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