98 cutlass electrical problems

My car is in the shop for the 5th time in 2 weeks. Initial problem car would not start. dealership replaced crank shaft sensor. Nex day same problem dealership replaced key lock cylinder. Third time no start dealership replaced a relay. Fourth time no start replaced key lock cylinder again. Had car one day it overheated, fans not running now dealer wants to replace body control module. Any opinios or advice? Thanks.

Check you battery connections very close. I have seen the positive battery post nearly gone between the battery and cable. Just a thought.