I don't see why not. As far as controlling the grids is concerned, the PCM is just a timer switch for either one or both heaters, depending on the signal it sees from the intake temp sensor.

I've been contemplating a 3 way switch that still utilizes the PCM as a timer but fools it into thinking it's much colder out than it really is


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So would you just have to find the wire that comes off of the PCM that goes to the relay that kicks on the grid and cut it and take it to a switch? I haven't gotten into the electrical system yet at all but is that right?

You should think about re wiring the truck I did mine this summer and before I did the speedometer didn't work and the truck would just shut off and dash lights didn't work. Old wiring is the main culprit of a car BQ

if I was a little better at wiring I would probably just do the whole thing, but right now it all works (except my trailering tail lights) and I don't have the time to take on anything that's not necessary, and its like 5 degrees outside and it currently transmission-less and thats my first thing I need to get taken care of.

Someday i might tackle that one.

No, just disconnect the stock grid relay triggers and connect your own manual trigger switch. Extremely simple. The hardest part is running new wires to it and mounting the switch.

I was going to but a resistor in line to fool the PCM that it's colder out than it really is at a certain switch position. I'm going to replace the intake temp sensor before anything


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Maybe even a high idle solenoid for one of the 3 positions


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You're over thinking this. You don't Need alot of complexity to get some heat in the intake for cold starting. The grid system is more complex than it needs to be stock. That's what started this thread in the first place wasn't it?

where are these wires I would need to find? I don't know anything about the grid system to be frank.