Question about 2007 Mercedes-Benz E320 BLUETEC Sedan

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Addding freon problem

I buy two of those one pound cans of freon at the store , i connect it to the low side , i turn on the car , but the freon remain in the can. it does not going to the sistem, would you please help me

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  • misfaxes Apr 22, 2009

    i took my car to a shop last year, they fill it freon, the told me the sistem has a leak. ok the thing is this the were able to charge it and make it work, i tryed my self to charge it but it does not going ttru for some reason, question does this sistem have something how to turn the compressor on in order to absorb the freon into the sistem?

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Is the A/C compressor turning on? If not, that's one reason and a big one as to why it won't take the freon into the system. Have the compressor checked to make sure it is even coming on. You can hear a click when it is turned on/off. No click sound, no compressor working! and therefore-- NO A/C working

Posted on Apr 22, 2009

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How much freon does a 2002 tahoe require.it has rear ac


Some systems take around 54 ounces, 3 1/2 pounds. This when it is empty. To fill, I always use a set of gauges. The low pressure gauge you can buy with a can it not good to use. You can fill it to say 45 pounds pressure, which is around right at 85 degrees. But the high side could be reading 400 pounds. Something will blow out at that pressure.

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Air conditioner does not cool in 2000 Yukon.How do I check freon level and how to replace freon if need be


Get an r134a refrigerant add kit from Walmart or your local auto parts store.

You can even get a can of Arctic Freeze by Intermatics that has a hose and a gauge on it.

Connect the hose to the low side port. You can find this port on the 'thicker' piping that comes off of the compressor (versus the thinner piping that comes off the compressor which is the high pressure side).

Pressure should read 25 psi to 45 psi on the low pressure side when the compressor is running and the a/c is on.

Pressure should read 75 psi to 100 psi on a hot day when the car is off.

However, you'll want the a/c to be running when you add freon.

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How to add refrigerants? To a 2000 buick lesabre.My car is blowing hot air it went from cool to hot. and now it just hot air coming out.


look for the fitting that is the smaller of the two and is attached to the line that is the larger of the two, this is the "low" fill side, add 2 cans of r134a freon each can is one pound the system empty holds 2 3/4 pounds of freon thats 2 3/4 cans.
I would buy 1 can of leak detector/freon combo and one can of dye/freon combo, if it takes more add a small amount of a third can that has an oil mixture in with the freon that would complete your systems needs the cheapest and fastest way possible.
If you want it done to the book then you need to have a certified A/C man vacumn pump down the system, replace the reciever drier, add freon and oil to fill the system and then check for leaks.
Happy Motoring!!

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Diod you charge the a/c, if its low, by that I mean if it needs a charge the compressor has a cut out switch inline with the power wire going to the a/c compressor clutch(it can also be referred to as a fuse depending on who you arer speaking with), it is there to protect the compressor from burning out.
You see if the a/c system has a leak....any air conditioning system not just a car.... along with the freon leaking out a/c compressor oil can also leak out with it especially if its on the high side lines or the compressor front shaft seal(which is behind the a/c clutch). That is why it is equally important to buy a 1 pound can of freon + oil combo and a freon 1 pound can with leak dye combo in it, if its down a little in other words the compressor turns on but isn't real cold then only install the freon + leak dye as the leak dye will travel through the system and expose its colors when it appears at the site of the leak, giving you a visual on where the leak is.
try adding some freon to the "low" pressure side of the suction lines of the compressor(larger lines with a larger fill port, be certain to purchase the proper fill hose and attachment needed for your particular car.
The auto parts store will assist you in this proceedure.
Once
You may have to locate the a/c compressor cut out I think its a threaded one that has a black electrical connector on top, remove the connector and jump the wires together to get the compressor to turn, then add the freon. Walla, the compressor is working and accepting the charge, if by jumping out the low pressure cut out switch no sound is even heard at the clutch you may have to replace the low switch as well.
This test also tells you if the a/c compressor and clutch are working properly, if you jump it out and it doesnt engage replace the clutch. You will need a puller, Auto Zone will lend you the tools for the job free if you buy the parts from them,cool aye?
Happy Motoring!!

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1 Answer

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This hjas a possible two part problem, the first part is the a/c compressor has a clutch on the end of the shaft and is engaged with the a/c compressor switch turned on, which means while the car is running, you turn on the a/c and walla, you get cold air(as long as it is fully charged), the belt drives this clutch which in turn spins the inside of the compressor and starts to mechanically **** freon into it through means of the low(suction) side, the larger diameter port, once low pressure freon either 134a for everything built after 1994 or freon r12 for cars built before 1994 enters the compressor it is then compressed into a high pressure liquid which has a high pressure test port that is always smaller in diameter then the low side (fill) port.
When the clutch is engaged, it will only slightly rattle after it gets a few thousand miles on it however as the vehicle gets more useage and the a/c gets more useage(considered extreme condition useage) more use then normal vehicles would otherwise get, the clutch starts to wear out causing this rattle. A clutch head puller is used to remove the clutch can't do it without the proper tools, the belt must come off before doing the replacement.
Any parts store will have the tools and the clutch, you don't have to release any freon for this repair.
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Buy a freon charge kit with a one pound can of 134a freon + oil combo and with the car running and a/c on high blow full cold attach the charge hose and freon into the low side port, rattle should cease soon as the vehicle reaches is full charge, should't take more then 2 pounds(cans) of freon, system hold 2 3/4 pounds empty each can is one pound.
Happy Motoring!!

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1 Answer

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Go to your local auto parts purchase a a/c charge kit for about $69.00, find the low pressure(suction) fill port, there are two ports in every a/c system one is a low pressure side used primarily to fill a system with freon 123a or the like and it is the larger valve mounted on the line, then there is the dangerous high side valve, this is a smaller diameter valve mounted to a smaller diamet a/c line, this is under extreme pressure so donot attempt to fill this high side with freon as it can backfire on you and cause injury.
The low side fill kit will not fit on the high side port so thank godness for that.
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A car's air conditioning system only hold like 2 3/4 pounds of freon, so in the event you happen to over fill the system a high pressure blow valve usually mounted on the a/c compressor will purge off the excess, but let me warn you they blow off without any warning and can startle you. Always think safety first, wear protective equipment. Work Smart, Work Safe.
Happy Motoring!!!

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1 Answer

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1 Answer

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low freon soumds to me.. jump out the low pressure cut out switch near the dryer...or jump clutch relay in the distribution center. with clutch ingauged hook up guages to check low and high side pressures... also easy trick go to auto store get a can of 134a freon with hose and add the can the clutch should stay inguaged longer and longer as you fill the sytem... with clutch inguaged rev motor up to 1500 the guage on the hose should be around 35 to 40 pounds if low add more

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You need to add the freon on the low side which is usually indicated by a blue cap. The red cap is the high side port. Never add freon using the high side port. Typically if you are buying a guage set from your local auto parts store, it will only attach to the low side service port because they are diffent types of connections. Another easy way to tell is to turn your AC on and feel the lines that the ports are attached to. The low side should be cold/cool and the high side will be hot.

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