SOURCE: front vents will not work
If they are stuck on defrost,then the problem is a little vaccum line that comes through the firewall as all the climate controls are vaccum controlled,so look for a small green or black plastic line unhooked.
SOURCE: 2004 Ford Expedition rear floor cool/heat
Item
Part Number
Description
1
—
Air inlet door
2
—
Temperature blend door
3
—
Headliner airflow
4
—
Auxiliary mode door
5
—
Floor airflow
6
18476
Heater core
7
19860
Evaporator core
8
19805
Blower motor
The auxiliary A/C and heating system has the following features:
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I would say the auxiliary mode door (#4) electric motor is not wokring.
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Auxiliary Blend Door Actuator —Air Distribution
Removal and Installation
SOURCE: 2003 bmw 325i a/c front vent
hi gc, if you are getting cold air and warm air out of different vents with the a/c on, I would recommend having the a/c freon checked. if the system is low, it can cause cold air out one side and warm air out the other. if it is low, the system should also be checked for the source of the leak.freon has oil in it that keeps the compressor internally lubricated and when freon leaks out, moisture can get in the system.
SOURCE: front heat works, but rear blows cold air only
With your front heat working the most likely cause for the rear heat not to work is that there is an obstruction in the line that is preventing the warm coolant to get to the rear heater core or the rear heater core itself is plugged and not circulating. Another possible cause could be low coolant level where the system has enough coolant to provide the front system with enought warm coolant but not the rear system. Hope this helps
SOURCE: A/C not coming out of the front vents only the
Scan for bcm codes. Possibile door actuator motor inoperable. Also check for vacuum leaks under hood and dash
When I turn on the heat in my 2004 mazda mpv the front air vents blow heat but the rear air vents are blowing cold. I have adjusted every setting is there something I am overlooking.
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