SOURCE: my 1995 bmw 525i passenger window stopped working
Verify the wires that run to the trunk, after many opeing and closing the wires wear, you may have short. There are many post in some BMW club forums.
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SOURCE: 1995 BMW 525I over heating issue. I repaired head
Hi, Sounds like you have tried about everything. Ok the aux. coolant switch is for the electric pump for the heater core will not cause an over heating condition just a longer warm up of the heater core. Has the cooling system been bleed properly if there is a trapped air pocket it will not let coolant circulate. Was the new thermostat installed correctly? They have a vent that needs to be towards the top or they trap air on the back side and cant take an accurate reading to open and close. Other areas to look at would be proper operation of the fan clutch, if they fail they can cause the fan to not lock up properly and supply enough air movement through the radiator. The aux. electric fans and their temp switches do you hear them coming on are they coming on at the right temp.
SOURCE: 1995 bmw 525i repair manual
Amazon.com, Bav Auto or Pelican Parts - all online handle the Bentley Service manual for your Bimmer. It's not cheap - $60 but it's priceless with the info you get. Ebay is another possibility.
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