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Well, score one for me. Instead of testing it, I just pulled the water pump. Here's what I found: It looked good when it came out. then I tried to turn the impeller- it turns on the shaft. Pulled it off, all the splines are sheared off, so it just freewheels on the shaft. Problem solved...

We will find out in an hour. :???:

I did chew the driver out- but I'm not going to charge him for any parts. As was said, I chose to drive it home without fully diagnosing it first. I did the simple thing first- I replaced the thermostat. It became obvious that was not the problem, only AFTER I got off the interstate. I was on...

I know Bubba, it doesn't make much sense. But the temp gauge doesn't seem to be working right at all, so I'm not trusting it and will be changing the sensor and possibly the gauge. The TM says that's the first thing to check, water pump flow. Next is to do a pressure test of the cooling...

I know, keeping my fingers crossed it is a 'simple' fix. I suppose I could have a blown head gasket too.

Not for good I hope. Yesterday, my driver was returning from Charleston, SC to Winnsboro, SC (approx 120miles) with the empty M967 tanker. At mile post 176, he noticed the oil pressure had dropped a little from its normal running warm place (around 60psi) and the temp had gone up. He also...