why does my 2002 trailblazer turn off when the heater,on windshield mode,is on?

Dear monstertruck36-- You obviously have an electrical problem somewhere and I would find it hard to diagnose from here. It's as if you told me you had a headache and I wouldn't know whether to tell you to take two aspirin or to have surgery right away. Get a hand on assessment from an honoest professional. God luck from Bovan.

My 04 TB is doing the same thing