BTW --- The temp gun is a great inexpensive tool to have -- and can be used for many things! Like Brake bias and header temps and all manor of stuff.
The key test there is that the gauge is accurate. Now we can use the temp gun to isolate or read the temps in various places to get a picture for what the issue is.
Make sure not to use these guns on chrome or polished pieces -- they don't get as good of a reading on those surfaces.
Many times -- I'll just read right off the fins of a radiator... just point the gun at an angle so it gets a good look at the surface you're trying to measure. It's also helpful to read near the exhaust ports of the head... the sides of the block etc.
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