If only cold air is blowing out of the rear vents in your 2001 Mazda MPV, it could be due to a malfunctioning blend door actuator, which controls the mix of hot and cold air. Another possibility is a low refrigerant level in the AC system, affecting its ability to produce warm air. Additionally, a blocked or malfunctioning heater core could prevent warm air from reaching the rear. It's advisable to have a professional diagnose the issue for a proper fix.
check your coolant level
Your thermostat is the likely culprit here it is probably stuck closed. Have it checked out.
Low coolant in the system. Defective heater control valve. Clogged heater core.
Premium only
that usually means that you turned off the A/C on a higher degree. If it was cold in the morning and you had the A/C on 90 degrees, then turned it off, even when the A/C is off it will still blow out hot air. Vise Versa. If you had it at 65 degrees, turned it off, the air will still blow in cold.
My Mazda 656 DX 1996 purrs when it's cold. It runs terrible since I moved to South Florida.
the blower motor has gone bad
this just happend to me is was low on freon/134a or it could be your blend doors are stuck
Because you set it that way
why does ac blow warm air? why does ac blow warm air?
Your heater will blow cold air only.
Bad thermostat