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2016 535xi seems like my shift patterns all Over the place…

Customer Question
2016 535xi seems like my...
2016 535xi seems like my shift patterns all
Over the place after taking it in for service due to a leaking heater core , i noticed antifreeze level being very high, car feels sluggish and i getting a rumble when accelerating also i get an unsmooth drivetrain feel another shake like rumble ? I have lift and fixed many of my cars due to unreliable mechanics wether dealerships or regular for my fleet of wirk vans so I’m willing to tackle fixing bmw i just took over lease on myself
Submitted: 24 days ago.Category: BMW
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Answered in 2 minutes by:
3/29/2018
BMW Mechanic: Steve, BMW Expert replied 24 days ago
Steve
Steve, BMW Expert
Category: BMW
Satisfied Customers: 25,394
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Hi there how exactly can I help you with this? What did you want to know?
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Customer reply replied 24 days ago
Why after bmw repairing leaking heater core(windshield would not defog and there was a oily antifreeze residue in windshield they repaired i assume replaced heater core refilled system and did oil change and other assorted maintenance, my question is what to do with heater core can cause shuft patterns to be off now (it ran better before replacing heater core ) also this car when i took it over had a jb4 performance computer upgrade fused in when i took lease over but i had that removed the shifting & accelerating seems to be very off and not amooth and car feels sluggish also tranny kicks sometimes and inhave a rumble when accelerating all after replacing heater core sommy wuestion is what can be causing all these issues
Customer reply replied 24 days ago
Why is transmission shifting late? After changing or repairing heater core Thats the qeistion
BMW Mechanic: JayPutelis, Shop Foreman/ BMW Master Tech replied 23 days ago
JayPutelis
JayPutelis, Shop Foreman/ BMW Master Tech
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Experience: 14 yrs Experience; ASE Master Technician; ASE L1 Certified
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Hi,

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-JP

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Customer reply replied 17 days ago
i iust got car back from bmw service dept and all 4 rims bent! But i brought it in dorythe acceleration after them replacing/repairing leaking heater core , car feels like it doesnt accelerate smoothly anymore nor does it seem to be shifting properly , i checked antifreeze level by removing cap to antifreeze reservoir and it in my opinion seemed to be too high filled to the brim? Right under cap theres antifreeze up to the brim, can this impact how the car accelerates and shifts ? To give you a better idea it seems it downshifts kate as well as up shifts late but begire heater core repair ,it felt a lot more responsive and due to me being very mechanically inlcined and having a pift in my warehouse to fix my fleet of delivery vans, id like tomtackle tuning tweaking car back to normal performance myself assuming i dont need to flash computer or anythung to re set shift patterns and characteristics if this makes any sense sorry for long message but my ultimate driving machine definitely isnt driving as if so ?
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