A/C question

[martinpd]

Sometimes I don't think my 96 Ranger's A/C is working as well as it should although it could be my imagination. At 90 degrees ambiant and running at idle my pressures are 50 and 275 with 58 degrees output. Seems to me the high side pressure is too high. Could my system be overcharged or is that a normal range?

 

[Earl43P]

Sounds high to me too.

Bleed some out and note result. I'd run it at 1500 rpm for realistic pressure readings..

 

[caveman_joey]

pressures sound high to me too .... 40-45psi suction is normal at idle for my 98 if "bleeding/recovering" some back out doesn't solve the issue i would say you may have air or other noncondensables in the system which would require a complete recovery, ecacuation and recharge by weight to factory specs... but also keep in mind that the r-134a systems do not put out the cold as the older r-12 systems do... oh yeah be sure when you are checking the system to have it set on max with the blower fan on high

 

[LearjetMinako]

You are within limits. A good A/C system should have a 30*F difference between the outside air and cold air. Yours on a 90*F day is putting out 58*F, so thats a 32 degree difference. Also, as the outside temps go up, effiency goes down. So the degree difference becomes less.

Tomorrow, I'll be doing a complete A/C flush and rebuild. My compressor seal is trying to go. So I'm going to go ahead and just rebuild the whole system.
Parts to be replace:
Acculumator
Compressor
Orifice tube
O-Rings

Edit: I forgot to mention this. With higher outside temps, the low side pressure will also increase. So 50psi @ 90*F is with reason. Usually its 40psi @ 70*F.

 

[4x4junkie]

You are within limits. A good A/C system should have a 30*F difference between the outside air and cold air. Yours on a 90*F day is putting out 58*F, so thats a 32 degree difference. Also, as the outside temps go up, effiency goes down. So the degree difference becomes less.

Both of mine (one of which was converted from R-12) have no problem blowing 40-42° when it's 90° outside. I would agree there's either too much refrigerant or contaminants in the system.