Question about 1998 Pontiac Sunfire

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I have recently bought a pontiac sunfire 96 model. I had to replace the heater core and it was very filthy inside. The battery in the car was no good when I bought it, but you could jump the car and it run just fine. I stripped all the insides out seats, console, carpet and entire dash. Cleaned it all extremely good put back together and put a new battery in. Now the car will start and run a few seconds then the THEFT light begins blinking and kills the car. I have tried almost everything I know to get the theft system reset and nothing has worked. Can anyone tell me how to do this?

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Try this, turn key on, but don't start car, wait 15-20 min, the turn key off, then try to start the car

Posted on May 17, 2009

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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

Jan 27, 2013 | 2003 Pontiac Sunfire

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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$

Jan 09, 2012 | 2000 Pontiac Sunfire

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Heat stopped working in 2000 pontiac sunfire

With blower on high and tempature to max heat check to see if you have good air flow in all mode selections (defrost, vent, floor etc.). If so and you still have no heat then check heater core hose going from engine to inside car to heater core with vehicle running and coolant tempature about half on guage. If both hoses are hot and coolant in radiator/overflow bottle is full then hot cold blend door is stuck in cold position. If coolant level is low you will get no heat, check coolant level first.

Dec 18, 2011 | 2000 Pontiac Sunfire

1 Answer

Fog on windows inside..I have replace heater core..and the thermastat..what else could be the problem

If you just recently replaced them, it could be left over coolant from the old core. Antifreeze takes longer to dry than water. G ive it some time, and if it still persists. you may have bought a bad core.

Feb 11, 2011 | 2001 Pontiac Sunfire

2 Answers

Is there an on line repair guide on how to replace a 98 pontiac sunfire heater core?

Remove or Disconnect

  1. Negative battery cable.
  2. Drain cooling system.
  3. Heater hoses from heater core.
  4. Instrument Panel.
  5. Heater core outlet.
  6. Heater core cover.
    • There is a mounting screw located in a recess in the center of the cover
  1. Heater core mounting clamps and beater core.
Install or Connect

  1. Heater core and heater core mounting clamps.

  • Screws to 1 N.m (9 lb. in.) .
  1. Heater core cover.

  • Screws to 1 N.m (9 lb. in.) .
  1. Heater core outlet.

  • Screws to 1 N.m (9 lb. in.) .
  1. Instrument Panel.
  2. Heater hoses to heater core.
  3. Fill cooling system and check for leaks.
  4. Negative battery cable.

  • Bolt to 16 N.m (12 lb. ft.) .
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Jan 01, 2011 | Pontiac Sunfire Cars & Trucks

1 Answer

Steps for replacing the heater core in a 1997 pontiac sunfire

This is a fairly easy fix.The steps are as follows:
  1. Disconnect the heater hoses under the hood.
  2. Go to passenger side under the dash remove the lower panel from the dash to access the heater box.
  3. Unplug any and all connections on the lower half of the heater box and remove the lower half of the box should be about six screws you should see the heater core and the evaporator core.
  4. Heater core skinnier of the two should have one or two straps holding it in remove the straps and remove the core and replace.

Nov 15, 2009 | 1997 Pontiac Sunfire

2 Answers

Its leaking water from the fire wall and steams up insiide thre car

either the heater core has sprung a leak, or the hose and its discharge is shooting inside the passenger bet is on the heater can by-pass the heater core.
remove both hose's that go to heater core and connect hoses with a piece of tubing, or make a loop with on hose to connect both water outlets .

Nov 12, 2009 | 1997 Pontiac Sunfire

1 Answer

96 sunfire belt diagram ...serpentine

10171018 <-part # for a belt routing label.
there should already be a belt routing label under the hood or on your core support with a picture :}

Aug 26, 2009 | 1996 Pontiac Sunfire

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