The fan and motor for the blower is usually under dash on the passenger side behind the glove box. Most of the time it can be removed by removing the bolts (should be 10mm) from the bottom of the dash area. I did not get the model of your vehicle, but sometimes you will need to remove the glove box to access.
In statistics, the coefficient of determination, denoted R2 or r2 and pronounced R squared, is a number that indicates the proportion of the variance in the dependent variable that is predictable from the independent variable(s).
Coefficient of determination. A related effect size is r2, the coefficient of determination (also referred to as R2 or r-squared), calculated as the square of the Pearson correlation r. In the case of paired data, this is a measure of the proportion of variance shared by the two variables, and varies from 0 to 1.