6.0 gas engines - it is zip tied to the frame on the drivers side front. (look for a circular orange plug end)
how do I replace block heater on 1995 dodge ram 2500
Yes. It is in the block near the oil filter.
Whatever 1 is the easyest to get to.
Zip tied to the passengers side battery wiring harness.
The Cummins engine does not come with the cord installed unless the truck has the cold weather package. Normally you have to buy the cord from the dealer. It will go on the passenger side of the engine. The heater is in the block behind the oil filter.
Not all trucks have block heater, but most do. The plug is located behind the passenger side headlight usually toward the bottom of the engine, some times it is easier to see from underneath. It is black with a male three prong outlet and can have a cap over it.
They are built internally to the under hood fuse block/computer. They are not serviceable. The computer that is part of the fuse block controls the lighting.
where is the heater control valve on a 1994 2500 suburban
Yes.
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Yup
It is on the driver side of the engine block.