[dknebel]

I have a 1991 k5 full size Chevy Blazer, it has a motor from a 96 Chevy pick-up truck in it, after I installed the new motor, it was overheating. I bought the blazer with no motor or trans, so I don't have any priors to go off. I have put in a new thermostat, changed coolant, new temperature sender (91 application, the one for the new style motor wouldn't read on the old computer), new water pump, new radiator cap, and now I just installed a 4 core radiator, the biggest baddest one you can get. What else is there? Could it be computer problems? I'm normally pretty good at this kind of stuff, or know someone who is, and I think I'm lost. Thanks in advance for all your help

David k.

[mazak]

Is the thermostat the right size? Make sure there are no collapsed hoses,making it heat up.is the fan or fans working ?are you sure there are no issues with head gaskets,on the engine. Can you see coolant flowing,before it heats up? How hot is it getting,