E250CDI 2013 RadiatorFan on full
Thread Starter
Member
Joined: Aug 2004
Posts: 135
Likes: 14
From: Sweden
2013 E250CDI BlueEfficiency 4Matic
Sensor replaced and now the fan is off.
Mission accomplished!
They emptied the system and got out 478g R134 and after good vacuum filled 590g and now its cooling better that before.
Thanks for all the help.
Mission accomplished!
They emptied the system and got out 478g R134 and after good vacuum filled 590g and now its cooling better that before.
Thanks for all the help.
MBWorld Fanatic!
Joined: May 2018
Posts: 6,600
Likes: 6,547
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
Thanks for the update.
Take this ref-pres-sensor issue as a blessing in disguise.
478 grams out of assumed accurate initial charge of 590 grams is 102 grams lost.
102 / 11 years = 9.27 grams a year, within the typical 8 grams per year lost from the shaft seal.
Now you know next time when and if you keep your car up to 20 years, latest 5 more years do RRR again.
If you lose more R134A, up to a point AC still decently cold, compressor black death can occur.
Our HVAC system needs a proper amount of R134A fill to also able to carry the Denso ND-8 compressor oil in circulation back to the compressor.
If R134A fill level too low, the compressor oil will get stuck plenty in the EVAP and compressor will suffer lack of lubrication.
So do not think refrigerant is only for cooling, it is also lubricating oil carrier. Hence this replacement of ref-press-sensor is a blessing actually.
How many microns did the HVAC boys managed to dry/vacuum your system to ?
Also where is their micron sensor located at ?.... stand alone portable micron sensor at service port or at the RRR machine ?
Did they inject nitrogen at low pressure ( 3 psi is enough ) while doing the ref-press-sensor replacement, this will keep the filter drier stay dry and new one not needed because no wet
ambient air ever enter your HVAC system during the swap.
Take this ref-pres-sensor issue as a blessing in disguise.
478 grams out of assumed accurate initial charge of 590 grams is 102 grams lost.
102 / 11 years = 9.27 grams a year, within the typical 8 grams per year lost from the shaft seal.
Now you know next time when and if you keep your car up to 20 years, latest 5 more years do RRR again.
If you lose more R134A, up to a point AC still decently cold, compressor black death can occur.
Our HVAC system needs a proper amount of R134A fill to also able to carry the Denso ND-8 compressor oil in circulation back to the compressor.
If R134A fill level too low, the compressor oil will get stuck plenty in the EVAP and compressor will suffer lack of lubrication.
So do not think refrigerant is only for cooling, it is also lubricating oil carrier. Hence this replacement of ref-press-sensor is a blessing actually.
How many microns did the HVAC boys managed to dry/vacuum your system to ?
Also where is their micron sensor located at ?.... stand alone portable micron sensor at service port or at the RRR machine ?
Did they inject nitrogen at low pressure ( 3 psi is enough ) while doing the ref-press-sensor replacement, this will keep the filter drier stay dry and new one not needed because no wet
ambient air ever enter your HVAC system during the swap.
Thread Starter
Member
Joined: Aug 2004
Posts: 135
Likes: 14
From: Sweden
2013 E250CDI BlueEfficiency 4Matic
I didnt have time to wait for the car but i know that they didnt use a RRRmachine.
They had to go to a garage nearby to evacuate the system (thats why i know the amount).
The company is cerified for AC so i hope they know what to do.
About oil forgot to ask them about that, how do they add the oil back when filling from a 10kg canister?
They had to go to a garage nearby to evacuate the system (thats why i know the amount).
The company is cerified for AC so i hope they know what to do.
About oil forgot to ask them about that, how do they add the oil back when filling from a 10kg canister?
MBWorld Fanatic!
Joined: May 2018
Posts: 6,600
Likes: 6,547
From: Jakarta-Indonesia
2014 - W212.065 - E400 ( M276.820, 3 liter Turbo) RWD not Hybrid
I didnt have time to wait for the car but i know that they didnt use a RRRmachine.
They had to go to a garage nearby to evacuate the system (thats why i know the amount).
The company is cerified for AC so i hope they know what to do.
About oil forgot to ask them about that, how do they add the oil back when filling from a 10kg canister?
They had to go to a garage nearby to evacuate the system (thats why i know the amount).
The company is cerified for AC so i hope they know what to do.
About oil forgot to ask them about that, how do they add the oil back when filling from a 10kg canister?
not remove compressor oil at all. One loose only less than 1 cc, if any. If evacuation using HP port, there the compressor oil will be sucked out too...some, usually 20cc or there about.
The good practice is : Use LP port till near zero PSI and then also open HP port to get to minus level. Good recovery machine can suck down easy to -10PSI.
Vacuuming for our W212 is also almost no oil being sucked out.
If using decent RRR machine, IF both LP and HP get evacuated at the same time, the machine has oil catch system to measure what came out and can inject back the same amount.
What I do not like is RRR machine may not use Denso ND8 compressor oil, which is the best oil we can use. They may use lower cost compressor oil.
Denso ND8 is a VERY good double end capped PAG oil.
Your R134A being 590 grams is the same as mine, hence the compressor oil total is 120cc when HVAC system first installed/commissioned
Last edited by S-Prihadi; Aug 13, 2024 at 01:06 AM.
