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Robert, UK Qualified Car Technician
Category: Car
Satisfied Customers: 4716
Experience:  Fully qualified / self employed garage technician in the UK
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Golf Mk4 Drivers door. Window motor keeps running when the

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Golf Mk4 Drivers door. Window motor keeps running when the window is fully closed. The gears then slip. How does the motor know when to stop. Is there a limit switch somewhere.
Hi..there.. Normally its done with a thermal overload element in the housing that stops the motor if current becomes too high from too great a load as the window reaches the top or bottom and cant be lifted/lowered any further the motor draws more current,overheats thus the element cuts the motor for few seconds before it can be used again and thats how its basically works...from what your saying..if the switch itself does operate the window up and down then the circuit does sound to be fine..but the problem only seems to occur when the window reaches the top or closed positon might suggest an issue with the regulator itself albeit the could be the teeth on the regulator have worn to such a point that when the window reaches the closed position and load is then on the motor because it cant push the window up any further it slips due the teeth being slightly worn or the teeth on the motor itself is worn..either way i think it basically an inspection that will need to be made on the condition of the regulator itself especially wear etc..and then consider maybe fitting another regulator in place..being the age of the car you shouldnt have much issue finding secondhand ones or even maybe aquire one from a breakers..
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