There are five vents across the dash. The center vent blows strong and lots of heat. All the rest of the vents blow hot air but with very little force. I have noticed the rear defrost is not as powerful as well. Any ideas?
There are multiple issues that prevent heat from coming through the vent. You'll need to see a mechanic. ----------------------------------------------------------------------------
Multi-cardiag M8
SOURCE: 1998 grand prix no heat on 1 side
thats most likely what it is. either that, or something has fallen down the defrosters and its blocking the blend door from opening or closing
SOURCE: Air comes out of the defroster and floor vents but not the air co
under the hood on the firewall there is a square boxlike cover beside the maxifuse&relay. there is a vacucum hose there that controls the vent shutoff had same problem with my 93 bonneville sse when purchased, check to see it has no cracks or has pulled out of rubber connecter .
SOURCE: ac vent problem
Damper/flap for driver's side is probably stuck. Try moving the selector from cold to hot several times. Also, move the recirc/outside air control if the previous doesn't work.
SOURCE: 2000 pontiac montana air conditioner driver side
That is correct, the air blend door actuator. "flapper valve" may need to be replaced or cleaned and free from binding up. Good luck and hope this helps. If there is an Auto Zone in your area, they can order the part you need and give you the step by step instructions to removing the old actuator and replacing it if it's damaged. Good luck and keep me posted, be glad to help.
SOURCE: The blower fan on my 2006 pontiac torrent
The heater blend door actuator (motor) is faulty.Replace actuator
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