Mazda Millenia heat help

MICHAELHELMS

MEMBER
1998 MAZDA MILLENIA
6 CYL
FWD
AUTOMATIC
130,000 MILES

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

Sunday, December 5th, 2010 AT 2:46 PM

1 Reply

WRENCHTECH

MECHANIC
20,761 POSTS

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.