Check the coolant level in the radiator. If it is low the coolant will not pass thru the heater core properly.
AnswerAlso check for leaks around water pump. Could be an early sign pump is about to fail.
Answer
It sounds vaccum related, most heaters have vaccum operated doors to redirect air from vents to defroster to floor etc. vaccum may be lost at idle due to a leak or a reservoir problem.
the third answere is almost correct. the first two are poor guesses, at best. heat and cold are controlled by blende doors. in the millenia the blende doors are controlled by electric motors. however, the main control unit for all the doors is the a/c amplifier. i would first try another amp. you can get them cheap on ebay, and they are easy to change
Mazda Millenia hoods from models 1995 to 2002 will fit on a 1995 Mazda Millenia. The Mazda Millenia was first launched in 1995.
Mazda Discontinued the Millenia in 2002.
2001 Mazda millenia
where is the water pump located in Mazda millenia
how to replace a 1998 Mazda millenia alternator
i need a diagram to show me how to remove a starter on millenia s 1999 mazda
Need to know how to fix the horn on a 1997 mazda millenia that doesn't work?
how to change speedometer sensor on mazda millenia 2000 2.3 v6
The 626 and the Millenia share the same 2.5 liter engine,the only difference being the version in the millenia makes more power.
i have the same problem with my Mazda millenia 2001
a Mazda millenia with a miller cycl engine 2.3 engine has 6 igition coils
The S denotes the 2.3 Supercharged engine one the Mazda millenia (rather than the regular 2.5)