MIKE COOK

I have a 2003 f150 4x4 lariat. The climate control system is acting up. When cold outside, the display on the unit flashes and there is a clicking noise behind the glove box. None of the heating or cooling functions work while the unit is flashing. After about 5 min. all goes back to normal. All other electrical functions work. I have researched the GEM module, but not sure. I get different infromation about where this is located. some say behind fuse box, others say behind glove box. Any help or ideas will be greatly appreciated.