radiator flush and 4x4 lights on 1996 Ford Explorer

how do you flush the radiator in a 1996 eddie bauer ford explorer 4.0 4x4 and my 4 low and 4 auto lights start flashing and i have no 4 wheel drive when this happens is it the switch?

2 answers
have a lube shop flush it
First thing to check on 4x4 problem is the actuator motor on the transfer case.
Can "tap" on it with a small hammer if it now works replace it!! They give a bunch of trouble.