Ashman: you are correct in the aspects of antifreeze being a less efficient of conductor of heat as compared to water. However, like many things in life, a compromise is required. Your friend is asking for trouble, especially if he has any aluminum components such as the head, block, radiator, thermostat housings, etc. Water is known as ‘the universal solvent’. Just because we drink it, it does not mean that it is benign to other things, such as metals. Your friend is going to have a corrosion problem unless he adds something else to the water to prevent it. And before anyone pipes in here, yes, Water Wetter has some anticorrosion properties, but I do not think/believe that it is enough for street use (with water only).

Autozen: I am getting way off subject here, but some of the newer infrared thermometers have a multiple laser setup which displays a ring around the area being read. And yes, it is a really handy tool for numerous things. Thanks for the additional info on the 300SD. I *wish* that was the problem with mine, but its not

Thanks Again Guys!
RTH