I was going through some posts on block heater installation, and someone stated that most vehs. have the block heater installed already, they just don't have the electrical line connected. Does anyone know if thats true? I have a 85 300TDT and was quoted $300+ to install one. I've never checked to see if there is one. I was told its near the starter.

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85 300TDT 456,000 orig. miles