mazda millenia heat help

1998 MAZDA MILLENIA
130,000 MILES • 6 CYL • FWD • AUTOMATIC
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MICHAELHELMS
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  • 3 POSTS
1998 mazda millenia s problem: heater/defroster works great when car is moving (good heat temp) but when its sitting and idleing, it starts blowing cold or colder air. Help
Dec 5, 2010 at 2:46 PM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
That's probably a partially restricted heater core. You can try running some flush chemical through it and then disconnecting the heater hoses and flushing the core with garden hose pressure but that may not work and you ultimately may have to replace the core.
Dec 5, 2010 at 2:56 PM
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