I think it's the actuator controlled the electronic versions off the thumb wheel mentioned. Obviously can manually switch between hot & cold pre idrive, pain in the arse. Prefer the manual control

I'll put that suggestion in the maybe pile

It blows cold with the AC on, albeit noticeably colder on passenger side. Problem occurs when using the fans to let air in. Cold day, temp set to 16 & 4 blue bars each side on the climate menu yet vents blow hot air into car? I think the actuator is stuck on hot but bmw said no fault code stored ...

Hello,

First time poster & hoping someone can help me out. My 07 E70 4.8i has a problem with the heaters. They only blow hot, everything blue on idrive & climate set to 16 but insists on blowing hot. Drivers side seems worse the pax side & I think it's a lazy or faulty motor. Really annoying ESP ...