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AC, Heating
and Ventilation
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A/C
melting fuse box 
Cooling FAQ
has everything you need to do to keep your E12 from overheating.
Radiator upgrade
to increase cooling capacity with an E28 535i radiator.
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Exhaust
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Build your own exhaust
system
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Exterior
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Conversion to
electric windows explains how to convert crank windows to electric.
Door gasket and window channel replacement.
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Fuel
System
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Installing
a K&N Cone Type air filter 
Motronic conversion
Conversion to later style
L-jetronic with lambda control
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Suspension
and Steering
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Spring rates
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Tables
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Factory Parts Interchange
is a list of many parts from other BMW's that can be used on E12's.
VIN Number Ranges USA
E12 VIN numbers.
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Transmission
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Converting to a five
speed transmission
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