Question about 2003 Pontiac Sunfire

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Heater wasnt working in 2003 sunfire so just replaced the thermostat and water pump and still no heat

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Does blower work,,,try & find heater hoses.see is both are hot,,if not heater core

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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Normally we would start by changing the least expensive item and work up from there thermostat======waterpump .if it were freeze plug there would be no fluid left

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2003 sunfire 2.2 ecotec engine, fans working, hoses building pressure replaced thermostat but still over heating


Thermostat installed correctly? in backwards? low on coolent? Clogged coolent passageways, might want to flush system and refill. Too much antifreeze/not enough water will cause this also.

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My 2003 pontiac sunfire has no heat after replacing thermostat


by flushing the rad, you probably plugged the heater core up. Good to flush the whole system

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1 Answer

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$

Jan 09, 2012 | 2000 Pontiac Sunfire

1 Answer

Need to replace water pump on 1999 pont sunfire 2.4 liter engine are there any special tools required


No, just basic mechanics hand tools. This vehicle is 11 years old. I recommend you perform a complete cooling system service at the same time you replace the water pump. Drain, flush, replace the thermostat, replace the water pump, pour in a 50/50 mix of the correct antifreeze and distilled water. (Do not use tap water). Bleed all air from the system. Also inspect the radiator hoses and heater hoses. Replace as necessary.

Jun 27, 2010 | 1998 Pontiac Sunfire

1 Answer

What causes a engine not to heat through out?


Make sure theres no air in system..Your heater core could be plugged..Your fans may not be working,Or it very possibly could be the water pump.Or the radiator could be plugged not letting it circulate water..Could also have thermostat in backwards causing it not to flow also..Hope these help you find your problem and good luck Have a Great Day...

Apr 02, 2009 | 2003 Saturn VUE

1 Answer

My 2003 sun fire


test thermostat: turn on heater...is there plenty of heat blowing?
if not, replace thermostat.
if yes, then replace coolant, but flush cooling system before new coolant goes in.

Jul 03, 2008 | 2003 Pontiac Sunfire

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