I have automatic air conditioning in my 1995 Olds Regency Elite. After solving the problem I had with my programmer (replacement) and installing, the AC blows nice and cold after a while. Problem is the fan speed is set on high and the air coming out from the vents is only at about medium speed. I've heard that there's an air intake filter for AC on GM cars that needs to be cleaned periodically but don't know where to start looking for it. I'm going on a leap of faith that if the filter could be partially plugged by accumulations of fluff etc over the years that it will reduce the amount of air it can push through the system. That makes sense, but I've never been able to find such a filter. Anyone have any ideas how to increase the vent pressure output? I did replace the fan motor about 5 years ago because it was making bearing noises. The new one is working just fine still.
If there is a cabin filter, it only comes into play when pulling fresh air from outside the vehicle. It would not affect the airflow in the Recirculate/Max AC position. Not all GM cars of that vintage have a cabin filter, check your owners manual. I'm not familiar with the control panel on that system but you should be able to put it into Recirculate or Max AC and check the airflow. If it is still low, the likely culprit is an externally plugged evaporator. All of the air flowing through the system is drawn through the evaporator, regardless of the settings. Over time it acts like a filter and dirt and debris stick to it and block the airflow. (rodent nests in that area are also quite common) You may be able to access the evaporator through the blower motor opening or the blower resistor opening. However, many systems require removal of the HVAC case to access the evaporator for cleaning. This has been a design "feature" of most US vehicles since the 60's.
