Originally Posted by Brian Carlton

My favorite solution for higher than desired temperatures on systems that have been maintained internally is to remove the radiator and spend a couple of hours doing a thorough job cleaning the external fins........all the way through the fins.

You generally need a compressor, or a pressure washer, or some condenser cleaner, or a combination of the three.

When you get done, you should be able to hold the radiator up to the sun and see clear through the tubes, without looking at any crap. I'll bet that the radiator is 50% clogged in the fins, if it has never been thoroughly cleaned.

Your temperatures will drop by 5°C. if you perform this procedure properly.