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
That's almost normal depending on the vehicle. Is it a van or suv with rear air?? Need to know what kind of vehicle, but it's normal for cars rear air flow to be much less and not really cold or hot....remember--it goes thru alot of ducting to get to back seat. While moving along it loses the heat/coldness of air.
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