the blower is working, I am getting just warm air. I was thinking to get a A/c recharge kit, but i cant locate the low pressure valve.
Can you tell me where is located? maybe a pic?
thank you

before you start adding freon I would take a low and high side pressure reading to determine the REAL cause of the problem. It might be low freon, but it might not...

Just my .02

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Check high and low pressures first to be sure they are out of spec. Undercharging will produce subpar A/C performance, but overcharging will kill the system.

The low pressure port is on the suction hose which is typically larger in diameter than the liquid line and is often wrapped in some sort of foam insulation. It's the one that gets cold and can sometimes be observed "sweating" when the system is running.

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[QUOTE=gmercoleza]Check high and low pressures first to be sure they are out of spec. Undercharging will produce subpar A/C performance, but overcharging will kill the system.QUOTE]

Just out of curiosity, what happens with overcharging? Does that cause the pressure to be too great and blow out seals? Also, if the high and low pressures are out of spec, would that then pinpoint the problem as being the condenser?

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Overcharging can damage the compressor over time. It may not happen immediately, especially if there is a binary cutout switch installed. Those switches usually shut off the compressor at around 435 PSI, long before any seals would blow (unless there is an existing weakness, but that's another story). But higher pressures will definitely accelerate wear, as can generally be witnessed by the much shorter average lifespan of R12 to R134a converted systems; R134a pressures run in the neighborhood of 100psi more than R12 and really put stress on compressors which were originally designed for R12.

Pressures being out of spec can tell you if there is too much oil in the system, if the TXV is plugged, or if there is some other blockage in the system. It can help diagnose faulty switches and even tell you if the charge is simply low (the most favorable scenario). And yes, condensor blockage would also be detectable with gauges though there would likely be other indicators of that.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280

thanks for the help.
where is the suction tube located?
what tool is needed to check the pressure? whats the normal pressure?

thanks again

Unfortunately, there is not one normal pressure. Rather, there is a chart of acceptable pressures. Even then, it's only a guess, but usually good enough to do the job.

The only way to know for sure is to evacuate and recharge by weight. I don't expect you to want to do that. I wouldn't.

Thanks for your explanation. I don't have a problem at the moment, but have been immensely appreciative of the level of expertise and willingness to share information here.

__________________
" We have nothing to fear but the main stream media itself . . . ."- Adapted from Franklin D Roosevelt for the 21st century

OBK #55

1998 Lincoln Continental - Sold
Max 1984 300TD 285,000 miles - Sold
The Dee8gonator 1987 560SEC 196,000 miles - Sold
Orgasmatron - 2006 CLS500 90,000 miles
2002 C320 Wagon 122,000 miles
2016 AMG GTS 12,000 miles