Question about 2001 Pontiac Sunfire

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Replaced motor in my sunfire 2001 and now it is overheating

We replaced the motor in my sunfire with a used motor heard it run before bought and ran fine she does but after about 3 days of driving it the motor started over heating and smoking took it to a mechanic who checked everything our pressure in the coolent lines is good no leaks, water pump is running and he suggested replacing the thermastate so thats what we did now it is over heating still any suggestions?

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Posted on Jan 08, 2014

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Posted on Jan 02, 2017

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SOURCE: I have a 2001 sunfire.

this could be your oil cooler check your water and see if there is any traces of oil in the water even if there aren't I cant see it being anything else because of what you have already had replaced,Ihope this is of some help to you.

Posted on Jul 29, 2008

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SOURCE: heat keeps fluxuating.

did you bleed the air out of the system? its a small blue screw. must be done when engine is warm and running.

Posted on Dec 30, 2009

LowJulz01
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SOURCE: pontiac sunfire overheating

hello! I had the same problem with my 2000 Pontiac Sunfire... there might be one of these 2 problems with it.... maybe the Heater Core is jammed and the coolant dosen't flow thru the engine to cool it off, or the water pump is defective.... does the heating works or not? if yes, the water pump is defect, if not, the heater core is jammed, try a ''radiator hose cleaner'' (sold in Napa's or Carquest..) it will act as a kind of ''decloaker''.. if works, good! 15$ solution... if not, replace Heater Core... ~150$

Posted on Jan 15, 2012

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Pontiac sunfire overheating


hello! I had the same problem with my 2000 Pontiac Sunfire... there might be one of these 2 problems with it.... maybe the Heater Core is jammed and the coolant dosen't flow thru the engine to cool it off, or the water pump is defective.... does the heating works or not? if yes, the water pump is defect, if not, the heater core is jammed, try a ''radiator hose cleaner'' (sold in Napa's or Carquest..) it will act as a kind of ''decloaker''.. if works, good! 15$ solution... if not, replace Heater Core... ~150$

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