When I turn on the A/C or the heat it blows great up front but the vents in the rear don't blow very well you can barely feel anything coming out what could be wrong

Hello Katherine, If your car has a cabin filter, I would check to see if it needs to be replaced.

Problem is the blower motor or resistor has gone bad

may be flapper door not opening and closing or leaking heater core..is it fogging windows?

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.

The blower motor is either bad, or if you hear it blowing in the front but nothing comes out of the vents, then it's a vacuum motor problem. The flaps aren't angled right to allow air to come out of the vents (either for a/c, heat, or defrost).

Got the same problem, front blower does not work but the rear blower runs great...Need Help!!

The blower motor resister shorted out common problem. It is located behind the glove box on the HVAC assembly.

Hope I was avle to help, glad you up and going.

u may hav to open the doors as that may be stuck , a big job if u hv the time

my durango 2001 will not crank, appears not to be getting fule. the fule giage reads empty eventhoujgh i put gas in it. I,ve checked the fuses and find none blown. on the dash it reads " no buss" can someone give me opptionsbefore i go nuts mand burn it down? ;( Thanks Frank