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Legends are notorious for blowing head gaskets- the most obvious signs of a BHG (blown head gasket) are: White milky substance on the bottom of your oil cap white sweet smelling exhaust a surging idle when the car is started cold.
Have a mechanic run a compression check on all 6 cylinders- this is the most sure fire way to tell what the problem is.
If all cylinders are good to go- check the hoses going to and from the heater core- these sometimes crack and **** in air which will create problems.
Water pumps for this vehicle are recommended from acura to change every 60000 miles so that could be your issue too.
One of your redundant magnetic speed pick-ups are bad. Probably a couple hundred bucks service from your dealer. Worth it. I also had a low idle problem when this happened; car would die at low rpm. New mag pick up fixed that also.
This could happen if your fan is indeed weak. To test disconnect the thermostat of the radiator by removing the terminals near the radiator hose towards the engine. You should see the fan run at its highest speed, then you can check if your fan has weakened.
I had the same problems with my Acura Legend. On the problem with the running hot and the idling up and down, your cooling system is low. Fill your cooling system start it up and look for leaks, steam, or etc. repair and refill and your problem should be cured if the cooling system is full. At this time i'm working on the other problem. Good Luck