nobody got to this yet? gee
yes E32 is overheat stage1
if the radiator is dirty blow it out
make sure coolant is up in the reservoir and radiator
the scan port?
well the diagnoser plug will be in 1 of 2 places
older units it is behind the right step kick panel cover
newer units (tier2 and up) it is underneath the cup holder on the wire harness.
if your looking for the OBD connector on older trucks it is in the wire harness under the dash at the cup holder, same with newer trucks.
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