About a year ago, I purchased a 2012 M35h with ~80k miles. Thought it was in perfect condition, only to find out that the heater core needed to be replaced (driver's side no hot air, January in Chicago, not a good combination). Long story short, the dealer "fixed" it, but the process of fixing it screwed up things elsewhere that they were never able to properly diagnose or fix, and I got rid of the thing.

2nd baby on the way, and we're looking for something that can accommodate my tall frame (6'4") and a rear-facing child seat. I still really miss the M, and I'm seriously considering picking up a used Q70 L (not a specific one yet, still have a few months). I don't know that I'd call it a "common" issue, but when they fixed my heater core they had 3 other M's in at the same time for the same issue. Anybody know if this is something that's been fixed in the newer vehicles? Has anybody had to have this piece replaced again after already replacing it? Love the car, but I'm not interested in going through that mess again.

I have a 2011 with 120kmi on it and my heat is perfect. I think those cars were abnormalities. I'm sure you'll get a bunch of posts here saying "I haven't had issues"...I'd go for it.

Agreed with Ilya. I've had no issues with heat or cooling in my 2012 M37x at 108k miles.

Nothing on my end either.

Could of been a fluke or a bad batch from a supplier

Come back to the dark side.

Andy

No issue on my 2011 M37 with 91k miles

I have the same issue now. Some days the heat on the passenger side is cool while that heat on the driver side is hot

Middlebh, have you tried flushing of the heater core?

To OP, arrogantyeti101, although it doesn't seem to be an issue on the new cars (yet), I'd still consider doing a flush preemptively, as was advised by 2 members in threads here.

The part number changed for cars made from Feb 2018, which ended up being a supersession on the old part number for earlier models. I take that as some sort of acknowledgement/correction on Nissan's part, so whether or not you were planning to buy that new of a car, I'd still do it as preventive maintenance.

Hell no it's not fixed. Just bought a 2016 Q70 same issue. Dealership says they will give $400 of the $2600 it will cost.

I too have the issue of hot air on the driver's side and cool air on the passenger side, even when both are set to 90 degrees. I believe last time i checked the OBD it was throwing some heater system codes too.

I'll look into flushing the heater core and seeing if that provides any benefits.

Brian35XR wrote: ↑

Wed Mar 10, 2021 8:18 am

.. I believe last time i checked the OBD it was throwing some heater system codes too.
...

What were the codes?