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78710.18+ miles - Dr. Bob 06/01
 Cooling
System, Continued.
One or two more 'spikes' in the temperature have occurred since the
overheat protector was installed. The temperature headed for 9 o'clock (220°F) and then came
down after a bit or behaved quite normally after the car cooled. I decided that it was time to
change the thermostat and otterstat (cooling fan switch/temperature sensor). I purchased
replacements from PJ Grady, along with the O-rings and gaskets needed to remove the "inter
inlet manifold" that connects the throttle body to the intake manifold. Either this
part, or the water pump, must be removed to access the thermostat! I chose the easier one! The
"inter inlet manifold" can be seen in sketch and picture, below.
Since the inside of the throttle body was dirty, and since the throttle cable assembly had
already been removed to get to the thermostat, I decided to remove and clean the throttle
body.
It took me quite a bit of fiddling with the idle switch (it tells
the computer that the throttle is closed and it should control the RPM at 775) before it would
sometimes idle at a reasonable RPM. At other times the lever on the throttle body was not
returning far enough to activate the switch. Shortening the link between the throttle cable
bobbin and the throttle plate assembly seems to have fixed that. The throttle spring now pulls the
throttle plate firmly into the idle position.
With the new thermostat, and with the new otterstat,
the fans come on at a much lower temperature than they did before! Both the thermostat and
otterstat gaskets were in bad shape. The rubber otterstat seal had lost all it's
"give" and came apart in chunks when I removed the otterstat. Both parts had seen
better days.
The
"inter inlet manifold" is above the thermostat housing.
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