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Now, the problem. It idles fine but when I drive..it starts to overheat in about a few minutes or so. I check the hoses for temp, upper is hot, lower is cold indicating the t-stat is not opening (I did bleed and burp the system, yes).
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You can't bleed the coolant system, if the thermostat doesn't open. There's probably air not water behind the thermostat. That makes temp sensors read high usually.
What you can try is remove one of the sensors and makes sure water is there, get a temp gauge real temp gauge and monitor the thermostat housing, you can let it get to 85c-90c and still be good, if it doesn't open then replace the tstat or drill holes in it.
Your problem is you can't cool your engine, fans should be off until about 85c hopefully the thermostat opens.
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Does the coolant not flowing mean bad water pump? I did buy new, though.
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NO, where's the water flowing? I'm sure you spun the water pump by hand as every does before it even makes it to the engine.
what temps did you record for overheating? 220f 185f or needle on H