Greetings,

In trying to resolve a blower motor/ac problem (see post below) I've seemed to have created another problem -- blower motor air flow is weak.

The bm fan is installed correctly and is turning vigourously, however, something is causing the air flow from the vents ( and defroster) to be about 25% of previous flow. I cleaned a ton of debris from the area just to the right of the refrigeration coils. I thought that I got it all but I may have shifted it so that it is blocking the air flow. Plan to remove the bm, refractor, and fan again and attempt to remove the box surrounding the a/c refrigeration coils (radiator like component) to see if there is a blockage there.

I don't know if this is relevent, but the refractor panel (panel that allows outside air or shuts to cause recirculation of air) had some coating on the inside portion (it made it appear, at first glance, to be an air filter). After 21 years (yes, it's served me well since 1988) the coating was coming off and turning to dust in the bm fan box. In the interest of cleaning the system I removed the remainder of the material from the panel. I assume that this material was applied for good reason but should I attempt to find out what was applied (probably some insulation from an aeresol can) and return to original condition? I don't think this is the source of the air flow leakage but I'm sure it doesn't help.

The connection between the bm fan unit and the a/c box is not as tight as before I removed the bm unit to replace bm fan. Nevertheless, I can't detect any meaningful air leakeage at this junction.

As mentioned above, I plan to disassemble the bm fan and a/c housing units but was hoping to get an idea of what to look for. Has anyone had this problem? If so, what is the likely solution? Many thanks.

 

what year and model is the car? 1988?

 

It is a 1988 Integra. Well taken care of, the operating performance is sweet. The motor is tight and looks like a new car.

Should have bought a factory repair manual as a detailed wiring diagram would come in handy.

 

After reviewing an online, schematic diagram from Delray Acura's Parts department (good source of oem parts at a decent discount) discovered a foam rubber gasket was required. The original one had decayed to the point that removing the blower motor assembly left only a trace of the original.

Purchased some 1" thick, adhesive foam rubber weather stripping from home depot and applied liberally around all ducts. Air flow is now back to normal.