The engine in my car (with manual transmission) overheated due to a cooling problem. The cooling problem has been resolved. Since the overheating there have been two problems. The engine speed is higher than expected for a given vehicle speed and idle speed is sometimes higher than expected.

I found coolant in the flex tube that brings hot air to the air filter box. I assume this happened when the upper hose connection to the radiator broke. The bottom half inch of the air filter is discolored green so coolant was drawn through it. Could coolant have interfered with the hot air valve such that something has been permanently damaged ?

I didn't find evidence of coolant having been in the duct downstream from the air filter box. If coolant did get through could it have damaged something ? The AMM ?

The wire in the AMM has a resistance of 4.4 ohms. (I don't know the accuracy of the cheap meter.) This is significantly out of specification (3.5 - 4 ohms). I don't know if this is a functional difference. The wire cleaning circuit does seem to activate with engine shut off.