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Hello,
The AMM cannot really be test on the car with any great reliability. It is an expensive exchange, look and see proposition.
Since you have the heat pipe door blanked off it is even less likely to be your problem.
It should have nothing to do with the temperature gauge in the instrument panel.
Two things that might cause that type of reading. A bad wire out to the sender but that can mean it can go cold and you do not mention that symptom.
The other readings, without the signs the engine is running hot, is a temperature compensation board in the instrument cluster.
They are notorious for going "bonkers" at any given time!
It creates wide swings by using large steps to show changes no matter if it's right or wrong. It is designed to remove slight changes of which no one likes to get scared by!
Do you know if it has been removed?
The pins that it connects into it get a jumper put on the cluster side and the board is tossed!
If you remove it, it will show slight variations of temperature relating to the thermostats operation and tolerance range. This is a good thing, really!
Information on its removal are noted and explained with pictures on Art Benstein web site, Cleanflametrap.com.
Check it out. Art does a great job showing his talents on that site. A wealth of information on the bricks are there.
The water pump leakage could mean it's bad or the seal that fits between the pump and the engines head could be seeping.
Can you tell if the leak originated from a weep hole in the pumps casting under the pulley or from up higher? Antifreeze streaks should be prevalent from the source.
If the board is gone replace the thermostat with a "Wahler" brand thermostat! They stay repetitive and accurate over a longer period of time. Worth the extra buck or two by far!
Phil
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