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Re: 2001 chevrolet pickup v6 overheating after changing...
If you are not getting heat now, it's because you have an air lock in the system. sometimes it can be difficult to burp the system. try turning the heater on high in the defrost position. run your vehicle with the rad cap off and keep the engine running at about 1500 rpm. That should give the waterpump enough momentom to purge the air through the engine. check around the heater hose area and around the thermostat area for any bleeder screws ( sometimes these vehicles will have 2 or 3 for ease of purging the air). hope this helps and if you need any other info please don't hesitate to write.
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You have (at best) blown a head gasket, or (at worst) cracked the block of the engine.
Cars today, being mostly aluminum, break in this manner rather easily.
Repairs will cost you many hundreds or a few thousands of dollars. The car cannot be used until the engine is repaired.
God bless your efforts.
HI. It could possibly be the the thermostat is stuck shut. If thats the case when the vehicle warms up it will probably overheat all the time. The best way to tell is buy a new one and change it. They are usualy around $10.00 at any autoparts store. If you change it and it still overheats, it could be the waterpump.