Hello, dont know if you solved this problem yet, I have a 1989 E-150, it was doing something close to this. I found the engine Computher was faulty, never set a code, never lit the enginge lite, What happened was the heater core had a small leak in it an dripped down into puther housing, as the puther sits right under the heater core, never had a smell of coolant in the cab or signs of coolant in floorboard
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Saturday, July 12th, 2008 AT 4:37 PM