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It is located on the left (drivers side) head. The units is made of aluminum and most likely will twist-off leaving the threaded base in the head. This will require extraction.

The units I have seen for sale on-line list the location as in the intake manifold, this is not true; at first glance; it may appear to be the location, but rest assured, you will find it mounted in the head.

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Q: Location of a Glow plug heater switch on 86 6.9L?
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