Tempo's of that vintage had a lot of trouble with the engine fan controller. If I remember correctly it is behind the glove box. If the fan isn't coming on, this could be your culpret.

With that said, you provided a pretty strong clue. The coolant should never be a rusty brown color. If it is as you say, the problem could be nothing more than a badly clogged radiator.


Jim Johnson
98 SVT