Simple overheating diagnosis

[rrob@...]

Steve I bought my IR temp gun from Radio Shack on sale for $25 but I hear they
are now twice that. I use it every day on the road to check tire temp at rest
stops. I use a tire guage first thing in the morning and IR the rest of the
day.

Quoting transit360 :

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>      I'm working on an RTS (taking a break from my 2 Bluebirds),
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> however my question is general and not specific to just one bus.
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>      How can I tell if I'm getting proper flow of coolant through
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> the radiator? I will be purchasing an infrared non-contact temp gun
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> (where is the best place to get them?), but for now, I am collecting
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> advice on radiator dynamics.
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>       I got the old bus to operating temp, but while driving I
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> notice she gets little hot. I checked the radiator when I got home
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> and on the outside I put my hand on it and was NOT hot to the touch.
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> The tanks on either side were super-hot. I shut the bus off and felt
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> the inside (towards the engine), and the top of the radiator was
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> warm, not hot, and the bottom was hotter. What does this tell me?
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>       I did find on hot spot on the lower part of the radiator, and
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> after looking contributed it to being clogged with oil and dirt. The
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> rest of the fins looked good. What's the best way to clean the fins
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> in the radiator?
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>       My fan is working great, coolant is good. Any suggestions on
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> diagnosing a worn water pump? Just looking to get this thing running
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> as cool as possible. Thanks.
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> Steve
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> '79 GMC RTS and 2 '98 Bluebird QBRE's
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