Engine heating only when idling or when driving in town with red lights

Tiny
RERUAM57
  • MEMBER
  • 2004 KIA OPTIMA
  • 150,000 MILES
Fan cuts on and thermostat replaced. Possible air pocket in cooling system. Water pump driven by timing belt. Lost antifreeze a while back and might've got an air pocket. How do I get air pocket out. Stays cool on highway or in town with no stop and start a lot. Just heats up when not moving like in drive thru line and bank or fast food place, or numerous red lights.
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Tuesday, July 16th, 2013 AT 6:04 PM

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Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,014 POSTS
If the fans are working, you may need to flush the cooling system to clean it out. As far as bleeding the system, there should be a bleeder near or on the thermostat housing. If there isn't one, I always loosen the return line from the heater core to allow air to escape.
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Tuesday, July 16th, 2013 AT 6:53 PM

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