solving two partial differential equations nonlinear in comsol?

Hi,

I want to solve two pde nonlinear with two variables (please find in the attachment file) with the constants.

For solve, i tried to use the heat equation and PDE (c) in two step:
step 1: solve PDE(c) only
step 2: solve two equations with the step 1 results

Unfortunately, the results weren't changed anything if i change the constants.

Are you see this problem?