Aliaz

After 1½ month the cold A/C air isn't cold anymore.

Drove to the mechanic. Unfortunately the havent put in something so they were able to track the leak.
Took off the refrigerant and put on 950g as should be and put in something so it's possible to track. Couldn't see any bubles/leaking.

But..
It was working 1 day - and now it isn't working again.

Hope they can spot it with light/neon this time at next visit.

He said that the condenser wasen't leaking.

My question - is there a "normal" leaking-place on W211 E320 CDI '07 ?

Plutoe

If you could see bubbles, you would not make it out of the shop and still get cold air!!

The good news is the condenser is not leaking, however all the joints and connections are suspect----Be patient they will find the leak----Good Luck!!

Aliaz

Are you sure? I hope so!
How many connecions/joints are behind the blower/inside the car. Is it easy to get in there?
When he couldn't se any leaks in the engine room - he thought it could be somewhere behind the blower. Is it a good guess? Thank you for all your help!

Plutoe

Many people confuse the condenser with the evaporator(behind the dash).

There is a high(after compressor/condenser) and low side(after the evaporator and back to the compressor) therefore each key component has an in and out fitting.

Once he places the dye in the system he will be able to check the visible joints, the evaporator will be checked by watching for the dye in the under car condensate drain.

Good Luck!!

Aliaz

He showed me the condenser through the rills in the front.

This time, when I push the A/C to "on" - light turns off again within 2 sec. That didn't happend after first refill. Is it more empty this time and therefore shut's off the A/C system itself?

I've heard some whistling sound from the blower or behind the blower. Don't know if the blower is a little bad after 331.000 km or it could be leaking gas? Haven't heard the strange sound the 2 last days - where it also haven't been working.

Plutoe

First----------------Find and fix the leak------------then play around with the buttons!!!

vettdvr

A healthy a/c can lose 2 oz / yr of freon. This means in 5 yrs you can lose 10 oz with a healthy system due to normal leakage through the mechanical seal. Therefore it is possilble to be low on freon with no major problem. It doesn't have to be a leak if you have been 5 or more yrs with out adding freon.

TMAllison

On the W210 you could view the AC actual values and error codes in the CCU screen.

Is that not possible on the W211?

If the OP's AC is now cyclng off there ought to be error codes present.

Plutoe

You are correct, on W211 there is no actual value read out available on the dash control unit.

The values are only available by using DAS Xentry

Aliaz

7-10-12
Test on low side showed 2 or 2,5 bar (can't remember).
Test on high side showed 15 bar.
Tells that pressure is good.

When pressure is that good, does that mean that system aren't leaking?

Only 50g was on the system.
The 50g got off and then 950g on. Vacuum was testet for 45min with no error.

Just can't understand there was only 50g back with still good pressure.
________________________________________
Last edited by Aliaz; 07-10-2012 at 07:30 PM.

7-11-12
I think it's cooling after it was filled up to 950g refrigerant.
How much should it cool temp down to? And how will you check/test it by yourself?
Got it under 6 c. degrees. (same as last check with only 50g on). But it feels colder this time.

Is it possible to have only about 50g on the system without a leak - what do you guys think?
____________________

After 1½ months after refill it isn't cooling anymore.
I got it filled again this monday - the next day it isn't cooling anymore.

I'll visit the workshop again 11. oct. 2012.
They (and I) hope there's something to see with ultralight/neon.

Plutoe

Something is VERY STRANGE------you have a good system vacuum(less compressor)----that means NO SYSTEM LEAKS-----you fill refrigerant--------and you loose the refrigerant after 45 days.

There is only one other place that could be leaking-------the Compressor

Refill with dye, put the car on a lift, start the car and palce a light on the compressor shaft and watch for the leak!!

Aliaz

Thanks Plutoe. Yes it's very strange and annoying.
Yes, lost the refrigerant after 45 days.
But next time (this monday) the refrigerant only lasted for 1 day - the leak must be bigger now. He said that he have had the "buttom-plate" off and checked the car underneath, and couldn't find a leak

At next visit 11. oct - the mechanic hopes to find it with special light.

The condensor sits in the front of the engine room?
Is the compressor placed next to or?

vettdvr

convert bar to PSI???


It is possible to have an evaporator leak. Close the car overnight and close all the ac vents.

Then next day open car put sensor into pass side vent. Start car turn ac and blower on HIGH MAX COLD. See if you

have freon in the interior of the car. If so the evap is bad.

Aliaz

I've heard some whistling sound from the blower or behind the blower. Don't know if the blower is a little bad after 331.000 km or it could be leaking gas? Haven't heard the strange sound the 2 last days - where it also haven't been working.

I'm thinking more and more, that it was the sound og leaking refrigerant I've heard from the fan-side and not an "old" blower. BUT I couldn't smell unnormal air (refrigerant or tracking-thing)
Don't hope that all the dashboard needs to come off.