I think Larry may have meant check the voltage to the blower controller. The controller is the heat sink clad box near (below?) the fan. There are three wires to the controller - +12, -12v, and the control voltage 0-5v.

The system operates like this. The fan itself only ever receives 12 volts. The controller basically pulses the 12v on and off to maintain a certain fan speed. Slow speed is more off than on, high speed is more on than off.

The higher the control voltage the higher the fan speed.

You can access the control voltage at a plug somewhat near the brake booster. Control is, I think, a yellow wire. Should be able to verify that using the search function.

Using a multimeter hooked to the control line, you should be able to switch on the climate control and watch the control voltage rise from 0 to 5-6 volts. Turn the temp wheel all the way down to insure fan speed climbs to the maximum.

If you're not seeing 5-6 volts on the control line, then the pushbutton unit is suspect. If you are seeing full control voltage, then the controller or fan is suspect.

You can test the fan by directly connecting it to a 12v source.

Testing the controller is tricky. You'd need to be able to evaluate the duty cycle seen by the fan. An oscilliscope or fancy multimeter would be needed for that test; it's something I've never tried.

Lastly, what year is your car? The '94 and '95 models added dust filters. If these are not changed when needed they block airflow. The fan can run like crazy, but little or no air comes out.

Good luck,

- JimY