After replacing water pump, thermostat, flushed radiator it overheats at idle

Tiny
REDBONE
  • MEMBER
  • 2002 PONTIAC MONTANA
  • 3.4L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 170,000 MILES
Van has new water pump, thermostat, flushed radiator and it overheats at a idle. Could the heater core be bad?
Friday, January 27th, 2017 AT 4:29 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
If the overheating does not occur at highway speed when natural air flow through the radiator is sufficient, the best suspect is an inoperative radiator fan.
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Friday, January 27th, 2017 AT 4:40 PM

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