Low refrigerant? What to do? - Mercedes-Benz Forum
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#1 (permalink) Old 06-13-2008, 05:26 PM
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Low refrigerant? What to do?

On my 2000 CLK 320 my A/C built in diagnostic test gives me this error code:
Code B1241

And it means this:
Explanation: You're low on refrigerant! Get your A/C recharged and this should go away. This code disables your A/C. You may be able to bypass this block if it's triggered by a defective sensor.

I bypassed the disabled A/C but the air still doesn't feel any colder, but at least I can turn the econmoy mode light on and off as if my A/C was working.

So I phoned up a local auto shop and they told me they can recharge it for 250 bucks or so, BUT chances are it will just leak out in a week...so I've been told there is no reason why it should leak refrigerant unless there is obviously....a leak in the system.

But I've heard that it's common to have it leak out over the years in the E-class and CLK-class....

Any suggestions or advice?
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#2 (permalink) Old 06-13-2008, 11:05 PM
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I just had mine recharged on Monday. I have a 2002 CLK and yes, although nothing should leak out, after approx. 7 years, my mechanic said that it lost approx. 1 lb of freon. He hooked up his A/C machine and it read .6 of a lb in my system. He drained it and then refilled it to spec. which is 1.6 lbs. He then checked the system including hoses for leaks using computer equip and did not find any leaks. It cost me less than $80.

Only problem is that my E/C Light stays on unless I put the ignition in the on position and turn on the fan and press the E/C light to shut it off, then I start the car and the A/C works. I probably have to clear the code but the Service Engine Light is not lit.

Chances are, you need a recharge - you can buy a kit for approx. $50 and do it yourself. No way should it cost $250!

How are you bypassing the E/C. light?



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Originally Posted by Thomasbhughes View Post
On my 2000 CLK 320 my A/C built in diagnostic test gives me this error code:
Code B1241

And it means this:
Explanation: You're low on refrigerant! Get your A/C recharged and this should go away. This code disables your A/C. You may be able to bypass this block if it's triggered by a defective sensor.

I bypassed the disabled A/C but the air still doesn't feel any colder, but at least I can turn the econmoy mode light on and off as if my A/C was working.

So I phoned up a local auto shop and they told me they can recharge it for 250 bucks or so, BUT chances are it will just leak out in a week...so I've been told there is no reason why it should leak refrigerant unless there is obviously....a leak in the system.

But I've heard that it's common to have it leak out over the years in the E-class and CLK-class....

Any suggestions or advice?
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#3 (permalink) Old 06-13-2008, 11:45 PM
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Just get one of those 20.00 cans with the guage on it and the leak sealant. Hook it up to the low pressure port and go to town. You might need two cans. I put one can in mine and I had the same problem as you except I had to install a new evaporator temp sensor. Mine is nice and cold now.

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#4 (permalink) Old 06-14-2008, 01:05 AM
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how did u know to change the evap temp sensor?

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Just get one of those 20.00 cans with the guage on it and the leak sealant. Hook it up to the low pressure port and go to town. You might need two cans. I put one can in mine and I had the same problem as you except I had to install a new evaporator temp sensor. Mine is nice and cold now.
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#5 (permalink) Old 06-14-2008, 09:20 AM
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How are you bypassing the E/C. light?
" follow these instructions to override the sensor. (Your A/C compressor has its own pressure switch, so overriding the 'EC' light will not compromise this safeguard.) Switch the ignition on (position 2). Set the left temperature to 'HI' and the right temperature to 'LO'. Switch the ignition off. While holding the 'REST' button, switch the ignition on (position 2). On the left side, 'P1' will flash and on the right side, a code will be displayed. Press the 'EC' button twice so that the left side flashes 'P2'. Using the right side red temperature increase button, add 16 to the value. Press the 'EC button again to store the updated code. Turn the ignition off."

And there is more A/C trouble shooting stuff at this page:
How to Diagnose Air Conditioning Malfunctions | EclassBenz.com

Thanks for the advice...I will enquire about recharging my own A/C, can anyone give me any tips or a guide of how to do this?

Thanks.
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#6 (permalink) Old 06-14-2008, 10:33 AM
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Another good tip if you've never worked with freon, you have to constantly shake the can when filling to expel the gas from the can.

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#7 (permalink) Old 06-15-2008, 11:15 AM
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Quote:
Originally Posted by consumerpi View Post
how did u know to change the evap temp sensor?
I used this site....
Air Conditioning Diagnosis | EclassBenz.com

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#8 (permalink) Old 06-15-2008, 07:47 PM
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Thanks!

Was the Evaporator temp sensor hard to change? Is that a DIY or is it located in the dash?

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#9 (permalink) Old 06-16-2008, 05:45 AM
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Quote:
Originally Posted by consumerpi View Post
Thanks!

Was the Evaporator temp sensor hard to change? Is that a DIY or is it located in the dash?
im so glad I dont have the control unit in my car, but the good old fashioned dials to turn. I dont have any error codes to deal with, just plumbing ! I got my air topped up, they checked for leaks and thats its ready to go, ice cold !

Everyday I see people with more issues with their control units ! good luck...


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#10 (permalink) Old 06-16-2008, 08:25 AM
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Quote:
Originally Posted by consumerpi View Post
Thanks!

Was the Evaporator temp sensor hard to change? Is that a DIY or is it located in the dash?

Thanks to TK's Post.... http://www.benzworld.org/forums/gene...re-sensor.html

Took under 10 minutes its very easy to do.

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