[SP3333D]

Originally Posted by pduffy1064

This same thing happened to my brand new car last year at around 2,000 miles. Happened two times, but has not occurred since. I am hoping it doesn't come back this summer.

What did it end up being?

[pduffy]

Originally Posted by SP3333D

What did it end up being?

Not a clue, I was going to bring it in to have it checked out, but I couldn't replicate the problem.

[SP3333D]

They believe that they have it tracked down to a faulty JBE module (Control unit Junctionbox Elektronik). This is a coded part, so we are waiting for a test module to become available before pulling the trigger on a new $300 part...

[El Cheapo Loco]

Mine ended up being simpler but still pricey. I had the compressor replaced for around $1k and it's now good as new. I could've saved a couple hundred by buying online but wanted to have the parts/labor warranty that comes with from the shop.

Hope you get this sorted out.

[SP3333D]

they think that they have it fixed. they are out testing it right now. I will update if it works and what all it took.

[SP3333D]

Well, they claim that they fixed it and it is blowing 40 degree air now. They are on their way to drop it off to me and I will get the bill and parts list on Monday. Will update this then...

[pduffy]

Had this happen to me again Thursday while heading out of town for the holiday weekend. Interestingly, it seems to only happen when it rains.

[SP3333D]

lol. wonder if iy is an issue with handling the humidity?

mine ended up not being fixed and I sent it back. they want to try another compressor now... new one arrives tomorrow, fingers crossed. Thursday marks 1 month in the shop...

[thomas88162]

Originally Posted by SP3333D

lol. wonder if iy is an issue with handling the humidity?

mine ended up not being fixed and I sent it back. they want to try another compressor now... new one arrives tomorrow, fingers crossed. Thursday marks 1 month in the shop...

Was a new compressor not already tried? I think you really need to consider a different shop...

[El Cheapo Loco]

Originally Posted by SP3333D

lol. wonder if iy is an issue with handling the humidity?

mine ended up not being fixed and I sent it back. they want to try another compressor now... new one arrives tomorrow, fingers crossed. Thursday marks 1 month in the shop...

This is exactly why I chose to pay $200 more for the shop to source the compressor instead of buying from amazon. In situations like yours, the $200 saved won't even cover the labor to take the compressor out.

[RD335]

This may have been tried and eliminated as a cause, but I don't think I've seen it discussed. The car has sensors in the dash to adjust the cabin temperature. I'm not sure exactly where the sensors are, I think they are in a grille below the AC controls. On a cooler day when the AC blows normally, take a hair dryer and blow hot air to the sensors and see if that affects the temperature of the AC output. This might point to faulty sensors, or faulty electronics that receive the data from the sensors. Apologies if this has been tried.

[SP3333D]

Originally Posted by elcheapoloco

This is exactly why I chose to pay $200 more for the shop to source the compressor instead of buying from amazon. In situations like yours, the $200 saved won't even cover the labor to take the compressor out.

In this case it was $1100 more for the bmw part. The new compressor was next day shipped and will be there tomorrow at no cost to me. Then they are going to swap them as part of the original bill. The service manager doesn't believe it to be faulty, but bmw wants them to swap it out before they open a case and escalate it up. The entire system has now been replaced, electronics/sensors/lines/compressor(2x)/condensor/evaporator. They are out of parts to replace... a lot of it was on their dime bc I refused to pay for guess and check.

And as far as choosing another shop, this is a bmw dealer with 3 master techs working on it, not sure who would be better suited...

[SP3333D]

They think that they may have finally figured it out(again). They ended up sending a case to BMW and their engineers pointed them to a hidden evaporator temperature sensor that was not on any diagrams. They pulled the part and it appeared calcified and exploded when they tried to test it. They ordered a replacement and are installing it right now. Fingers crossed that this is it! Will update with more information once it is confirmed.

[NEFARIOUS]

Originally Posted by SP3333D

They think that they may have finally figured it out(again). They ended up sending a case to BMW and their engineers pointed them to a hidden evaporator temperature sensor that was not on any diagrams. They pulled the part and it appeared calcified and exploded when they tried to test it. They ordered a replacement and are installing it right now. Fingers crossed that this is it! Will update with more information once it is confirmed.

If that is indeed the case, please post the P/N and location.

[markus037]

you need a new shop with actual technicians not parts changers. if i did that id be fired or very broke because id be working for free after the first time i misdiagnosed. id ask for my money back. also did they even check the pressures of the system? too many "we think its..." going on.

[Diego06330i]

:0

[SP3333D]

I was asked to update this when they got it figured out. It appears that they finally figured it out about 2 weeks ago. Ended up being a pinched line that was overlooked in the first pass of the lines (and apparently the only line that they didn't replace when they told me that they were replacing the lines). I had the car back for the weekend 2 weeks ago and it started to develop low pressure issues. The low pressure issue turned out to be a new leak in the evaporator.

The new evaporator is supposed to be installed today and then we get to sit down and settle out this bill. My understanding from the agreement that we had going in was that I am only paying for the repair that actually fixed the problem(the new line and the install).

This leaves the dealer to shell out the money for the 2 compressors(they believed the first to possibly have been faulty), 2 condensors(first one developed a leak), replacement lines, evaporator, HVAC control module, temp sensors, miscellaneous other sensors that were all replaced.

Today is day #71, but I have to admit, it has been kinda nice driving their F30's and F10's for the last 2 1/2 months...

[SP3333D]

Just some follow up. The pinched line ended up being the problem. Looks like PN 64536927845. The dealer managed to jostle the evaporator somehow and cause a new leak when they installed it. everything has now been replaced and sorted out, we are supposed to finalize the bill today...

[Hankdoll]

Originally Posted by SP3333D

Just some follow up. The pinched line ended up being the problem. Looks like PN 64536927845. The dealer managed to jostle the evaporator somehow and cause a new leak when they installed it. everything has now been replaced and sorted out, we are supposed to finalize the bill today...

Glad you finally solved your problem. A pinched line...I wonder why it worked in colder temps?

[SP3333D]

Originally Posted by Hankdoll

Glad you finally solved your problem. A pinched line...I wonder why it worked in colder temps?

Yea, it was weird. The only thing that makes sense to me is that it operated at a lower pressure and was still enough to cool(weak ac), but the pressure wasn't high enough to maintain that coldness at higher ambient temps and it caused the other components to get hotter and shut down? It was blowing in the teens when I got it back...

[JustinGTP]

You are so amazingly patient I have no idea how you did it. Great read on all your updates and I really hope they give you a good price for all the crap you had to go through to get your AC working. WOW!

[bender rodriguez]

Purge refrigerant into ozone then self fill.. Problems solved.