2001 Z3 BMW - My heat switch feels like the tension cable broke. Is there an easy way to get to that to correct the problem? I'm not very good at fixing mechanical issues...

What would cause the heat control to not close so that there is heat all the time? What would cause the heat control to not close so that there is heat all the time?

Hello.
The heat and AC air temperature is controlled by a door that either mixes or "blends" hot air from the heater core or cold air from the AC evaporator core inside the dash air ducting. In your case the problem you have is common and caused by a tiny specialized electric motor called the blend door actuator motor. In most cases this motor fails due to excessive resistance of the movement of the blend due to heat warping the plastic blend door that the motor moves to control air temperature, so both parts are replaced in most cases to repair the problem. If the door is free and doesn't bind when moving then just the blend door motor can be replaced. The repair in most cases requires the entire dash assembly be removed, this is a very labor intensive job and the repair can run up to $1000.00 Hello. The heat and AC air temperature is controlled by a door that either mixes or "blends" hot air from the heater core or cold air from the AC evaporator core inside the dash air ducting. In your case the problem you have is common and caused by a tiny specialized electric motor called the blend door actuator motor. In most cases this motor fails due to excessive resistance of the movement of the blend due to heat warping the plastic blend door that the motor moves to control air temperature, so both parts are replaced in most cases to repair the problem. If the door is free and doesn't bind when moving then just the blend door motor can be replaced. The repair in most cases requires the entire dash assembly be removed, this is a very labor intensive job and the repair can run up to $1000.00