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Ac not blowing very cold after condenser replacement
Hello
this is about a w204 c180 but the AC system is to my knowledge the same as C63 and all the action is here.
Just replaced the condenser and vacuumed the system. I found no leaks after 6 hours with vaccum pump and testing.
Filled with 168g of r134a gas can. The AC compressor works and all seems to be good but the AC do not blow very cold.
Some site states that w204 should have around 550g of r134a so I guess I need to fill up with some more.
I've attached a picture of the gauge set with all the valves closed with 31 c outside temp with car off but don't know what to make of it. The car have just been driven.
I don't recall if the W204 has a sticker mentioning the "weight" of gas to be injected which could be somewhere in the engine compartment. I know my W202 C43 does, so hope the W204 also has it. Check under the hood.
You really should have a professional pull a vacuum on the system to boil out any moisture and charge it to the correct weight. The entire weight of the can will not be dispensed making it inaccurate. Low side pressure should be in the 25-40psi range. High side will depend on ambient temperature. ambient temp (F* x 3 +/- 25psi) example if its 31C = 88 F . 88x3 = 264psi. +/- 25psi. So ideally 239psi to 289psi on the high side. This would be while revving the engine up to 2000rpm. Id say replace the drier cartridge too but that's part of the condenser on the 204.
I'll also add the weight spec sticker is under the hood. Typically on the hvac intake box but alot of them get blasted off by power washers and used car lots etc....
Did you replace dryer/filter (Not sure if your car has one but most do)
HOw is expansion valve aka orifice tube?
Normally a good AC repair will replace these 2 things whenever the system is open.
MB service book should give pressures required based on ambient temp and humidty this can help to ensure it is charged enough.
There was a crack in the condenser due to rockchip. I replaced only the condenser and all the o-rings. The rest of the system should be fine. Oh yes, how stupid of me, I can just check wis. I need a vacation.
There was a crack in the condenser due to rockchip. I replaced only the condenser and all the o-rings. The rest of the system should be fine. Oh yes, how stupid of me, I can just check wis. I need a vacation.
Usually as someone here mentioned, whenever the system is opened, you replace the dryer & exp. Valve. Since you are already there and these are cheap items.
as for WIS, AFAIR they don't usually list the pressure, only the weight.
With the compressor off (car off) both low side and high side pressures should stabilize at the same pressure. That doesn't appear to be the case in the photo.
Why did you choose the alternate refrigerant instead of the R-134a that's spec'd for the system?
06-19-2021, 01:29 PM
