TTinCT

if you get the AC system evacuated and run the car for a bit...will the ECU throw a code that needs to be cleared once repaired?

Replaced a bad compressor that locked up....refilled with new 134a and the AC silll blows warm....wanted to see if there were any codes that needed to be cleared....

This is a 2006 R350 with 3 zone cooling ....

TIA

marc hanna

Is there a leak somewhere in the system? Is the compressor engaging?

TTinCT

To replace the locked up compressor. They had said everything was working ..we had a warm weekend and it clearly is not.
Upon return to mechanic...he looked at it agaim and now says there are codes being thrown by the AC.
I am going tomorrow to meet him as he told my wife today mercedes has to fix it. (Bigger issue there)

When I had it I did not here the new compressor engage. Prior there has been a clear click that the ac compressor is engagded. The inner section of the pulley appears to be turning...but my understanding is this is a direct drive compressor ..so maybe that's normal ?!! Insight here would be appreciated

This clown would not even disconnect the negative terminal on the battery to clear all resident codes. If there is something that failed it will pop up again. Worse case is a key fob reset...memory in radio and windows.

My sense on this one is he is in over his head ..passing it off to someone else is the easy way out for him

marc hanna

On my CLK55 I took it back to the dealer multiple times to fix the A/C. They never did fix it and then gave up - after I spent $1500 on it.

user 823908234

2007 R320 CDI 4Matic: a/c compressor crapped out suddenly, without warning, 2 months ago at 98,800 miles. Dealer did total flush, replacement of comp, drier, seals etc., with all our discount coupons and MBCA membership it only cost us $1,995 (included a brand new C300 loaner free for 2 days, and a hand wash). Really cold air again, like before. (My Indy was out of town, or I could've saved ~$800.

marc hanna

Maybe that was my problem: I didn't give them enough money

TTinCT

I met my normal mechanic who is a German car wiz today.
The local guy my wife took it too was clueless when I confronted him...so I drove and saw my regular guy a few towns over (I was out of town and she was on her own ) and we went over all the specifics. He thought it was extremely odd and will get a quick scan tomorrow with the codes thrown.
The local guy used a Snap On reader and it may not be advanced enough to reset the AC after a complete evacuation and runNing time...

Will report back the findings ...

josworth

The only Mercedes repair I have had the dealer do as well...same as @Jerryswfl only mine happened at 80mph in the middle of nowhere North Carolina... Totally took out pulleys and belt when the compressor grenaded.

$2500 for everything being replaced. Compressor, condenser, dryer, lines, pulleys, belt... the whole mess... included loaner for three days...

Long story...

But to do the same repair on my Chrysler 300 at the time was over 2 grand in parts alone... so didn't feel bad with the Mercedes bill.

How this relates to the OP?? I hope that when the compressor went, there aren't fragments in the system messing things up.

It is pretty common for them to replace other parts when a compressor goes, not just the compressor.

user 823908234

Jeff speaks truth; Mechanic said our compressor was internally disintegrating, and they flushed the entire system several times. Surprised (and glad) ours didn't grenade!
I saw no dash codes at any time. I don't know about other error codes.

Marc, I have learned you can't be stingy when it comes to M-B. Wait, does that stand for Money-Bags? Huh. I never made the connection.

marc hanna

I just stopped going to the dealer. I either do the work myself or take it to my indie. It's not so much that it costs less, it just gets done right the first time - that's what's most important to me.

user 823908234

We have used the dealer several times, and only once did they screw up. My indie works with us a lot better, and is really trustworthy. However, on our last big job, the turbo, he messed up the windshield washer hose, and forgot to install 4 bolts that hold the grille in place. I finished those little things myself, because he saved me ~$2,000. Plus, he's always good for a few jokes!

josworth

Actually, I've been real lucky with our small local dealer and with the Mercedes dealer in Winston / Salem North Carolina.

Our local dealer has some real nice folks working in the parts department and Jeff the service manager doesn't look or act like your typical service manager..

He actually had me show him how I did the coil conversion on my R so he could convey that to other potential customers if they wanted to go that route. Totally respects that I work on it myself.

Based on posts I've read on here I count myself very lucky indeed.

TTinCT

My preferred indy found a short to compressor code which is triggering a few other items which makes sense.
It goes back next Wednesday for a deeper look.

He can activate the compressor through his scan tool and the fans adjust to high speed and low speed.

I think we are very close...and have rationalized it down to 3 possibilities...

1- a relay burnt after the seize. With the larger sudden load or surge it took out relay.
2- a fuse somewhere ...fuse black diagrams are sketchy or non existent for this car. I did confirm fuse 12 controls the hvac control panel...that one is good.
3- something is up with the compressor itself.

I summit this as I recently went through a station with my audi with a ground fault. A 10 amp fuse tagged engine timing burnt out and triggered a ton of codes...evap..o2 sensor..coilpacks...etc...
Point being...it is likely one of those 3.

I found the 2008 r350 diagram on this forum but there is nothing about what the relays do...

Definitely feels like i.am on right trail...see where it goes...the car wentry two blocks with no belt. And when the belt let go...it was going 30 mph or so...no.dmage inside the bay but with all the sensors and relays it is very possible one shorted .

More to come....if anyone has a better link to what relays do...that would be great.

TIA

bbspoolside

Did you get your ac problem sorted out? I have the same problem with a short to compressor code and I can also activate the compressor thru star. Thanks

exhaustgases

Climate change is well financed. And the Marxist socialist communist democrats, yes that nut case Maxine Watters party are the ones spewing it all the time. It is a social political agenda, to be used to do what democrats do best, figure out how to take something away from you, me or us. So what are all you climate change supporters and believers (<--key religious word) willing to give up for your belief??
I bet you will not and can not answer that simple question.

Prerna

A/C on my R500 stopped working after a long time no driving. Whenever I switched it on I could hear a whistling noise but no compressor. I went innocently to a cheap garage where they offer full A/C servicing for 100, telling them I wanted my A/C serviced. He connected his machine to my A7C (1 blue and 1 red hose) and asked me to come back in 45 minutes. When I did, he explained to me the compressor had been stuck, probably because I don't use it often enough. All good now and only 100, I'm happy.
He said I should always keep the ventilation on in order to avoid problems; does it make sense?

dave2001auto

all good now at 100...?
sounds like a recharge was done. AC Seals dry out without running. MBZ AC has a long history of being weak, overly complicated and leaky evaporators. They have enough power now but too complicated. My 2009 is till okay, so maybe the leaks have been fixed.