This BMW Z3 had an issue on the heater fan blower. It would only work in position 4 meaning you couldn’t use any of the settings 1-3. Before replacing any parts we checked all the wiring running to and from the heater resistor for voltage and voltage drop. Once it was comfirmed the heater resistor was faulty we stripped the vehicle down.
Sadly it’s not a quick and easy replacement by dropping the glove box, on this model with A/C the heater resistor is located under the wiper scuttle panel. This can be a pain due to the wiper arms getting seized to the splined joint, once removed it was the case of removing the wiper motor to gain access to the heater resistor.
Once swapped over for a new replacement part the fan was working as new, and the customer so happy they also want us to work on another vehicle. If you need a auto electrical repair carried out you can call us on 07340 341790