can someone tell me where the low-pressure (fill valve) for my 2000 c230 komp A/C. there is a valve under a black plastic cap that screws on and it is just to the left and under the washer fluid reservoir which is on the far right side of the engine bay as you look at it. this looks like an AC valve but i am not sure if it is or not and i need to know for sure that it is the LOW -PRESSURE valve and not the high side. does anyone know if this is the low side or not? it is just under the largest black hose on the right side.
ALSO: does anyone know how much freon goes in my car ? how many pounds/ounces does it call for (maximum)
Did you find the answer yet? I'm just starting to look it up. I read somewhere 850 to 9?? Grams or oz of coolant. which was about about 2 pounds depending on the system I guess there was two different options for the 2000 models.
I believe the valve your looking at is correct for the filling. you can buy an ac retro kit at advance auto parts for $19.99. it comes with two cans of r134a and the gauges to fill. excellent and works perfect.
is r134a. The low pressure schrader valve will be the one with a black cap. The only one a fill valve will fit onto if you are topping off with a can of r134a.
Be careful mb a/c is variable demand so you can't tell by pressure alone your total charge.
:bowdown:
is r134a. The low pressure schrader valve will be the one with a black cap. The only one a fill valve will fit onto if you are topping off with a can of r134a.
Be careful mb a/c is variable demand so you can't tell by pressure alone your total charge.
:bowdown:
Yes that is what I thought we should do until I read about variable demand. I am not too sure what that means if it is different from other standard aircon set-ups
I could be wrong so take this with a grain of salt, but if you crank the Ac all the way down as you charge, the compressor should be cranked all the way up anyway.
If you are still concerned though, just take it to a shop, have them suck it down and put the proper amount in.
I wouldn't rely on gauges the get the amount of refrigerant correct. Even if you crank the A/C to LO, it's not guaranteed it will operate at maximum displacement, since it's a variable displacement compressor that is controlled by low-side pressure (as opposed to newer models which is directly controlled by the desired temperature). In other words, unless it's really hot outside, if you set the temp to LO, the A/C won't go to full displacement, and if you charge it at partial displacement, you will be over charged. The best thing to do is to find a place which can measure the amount of refrigerant pumped into the system by mass. The A/C sticker on the electronics compartment cover will tell you exactly how much mass of refrigerant you need.
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