My ABS module needs replacing, is this something I can do myself. Also my blower motor for my heater and A/C work some of the time, the heat comes out of the vents, but no fan. Then for no reason, it comes on. I did have a window leak and I am wondering if the module that controls this is damaged. I took it to an Audi expert who did a diagnostics and told me I need to replace my control head and it would cost $2000.00 Where are the control modules located for this vehicle? Are they on the floorboad and can I access them to check them out? Thank you