The
manifold heater's purpose in life is to heat the fuel
mixture to aid vaporization when the engine is started
at temperatures below 160? F. The heater itself is
under the carburetor. What is pictured here is the
thermal switch that operates it. The switch is in the
intake manifold's water jacket toward the rear. The
green wire goes to a relay that is taped to the main wiring harness against the
firewall. The red wire you see goes from the relay back
to the heater. This heater is independent of the
computer, and is not controlled by it.
There are several of
these relays taped in amongst the wiring harness
snakepit.
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