I have a 95 Bonneville sse. Where is the blend door for the a/c-heater? I think these are vacuum operated, where or how would I check for leaks?? I am not getting the air flow from the vents like I think I should. Already cleaned the evaporator.
Thanks guys.

The blend door just routes the air through the heater core to heat the air. The other actuator changes the point where the air comes out, defrost, dash, or floor.

Are you saying the air isn't blowing as hard as it should? That would indicate a problem with the blower or a blockage through the cores.

Yeah the air isn't blowing as hard as I think it should. I cleaned the evap coil last weekend and it seemed to help somewhat, but not as good as my truck or suv. I bought the car with 100,00 miles on it a coulple months ago just to use as a work car, it may still have original blower. It may be ready to take a dive. The fan sounds like it is running full steam, just not blowing hard. Where is the best place to clean cores,etc.

Did you do the evap cleaning procedure in the techinfo area?

Does the air flow out the defroster on HIGH fan speed seem adequate? That is the default setting for the 3 vacuum motors with no vacuum.

You might want to take out the blower motor and see if it's running as fast as it should and see what the squirrel cage looks like and if it's slipping on the axle. The plastic around the blower housing gets fragile with age and heat on that firewall, so work carefully if you decide to see.

There are three vacuum motors: one that opens a recirculate entrance above the driver's feet, one that closes off the floor opening in two steps of full or halfway for bilevel, and one that closes off the dash tube above the dash vents that normally lets air go to the defroster and makes it come out the dash openings.

If you have dual automatic air with a digital readout, you have two electric motors that move the vanes that blend the air through the heater with air that bypasses to give a temperature mix. If you have the manual control AC, you have one electric motor or actuator. These are accessed under the passenger side by taking off the hush panel under the dash. Taking out the glovebox may also help see what's going on.