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Update.... first and foremost thanks for all the great reply’s, I greatly appreciate the help! With that said, I purchased a laser temp gun and got the truck gauge up to 200 degrees and then put the laser on certain parts of radiator hoses. Nothing was over 135 degrees. So I guess this means...

Ok I will check that out thank you. I did just replace the belt. Also, the shutterstat is bypassed so the fan stays on.

I’ll look into that thank you

thank you, and yes I think I’m going to start with the temp gauge then try the flush. After that I will look into the water pump.

Hi guys first post here. I recently purchased a 1990 m931a2 with a custom lift bed, and roughly 10,000 miles. I’m pretty new to these trucks so bare with me. Anyways after fixing a few miner problems air leak, fuel leak, etc. I can’t seem to figure out how to fix or diagnose this temperature...