Chrysler Repair: Chrysler Concord LX - overheating, coolant temperature sensor, 2 cooling fans

Question
Question 1. While following the troubleshooting guides in the haynes and online at autozone I wanted to flush the cooling system. The haynes mentioned removing the engine drain plugs behind the manifolds on the left and right side. No picture and couldn't find them. Any ideas.
Question 2. Cooling fans don't appear to be turning on. Jumped one of the fans - runs fine. Replaced coolant temperature sensor. Still no fans. Dealer told me next step to replace wiring harness (cost $800 parts only). Have not taken to dealer yet to look at. When should the fans come on? Could the 1 fan I did not test prevent the other fan from turning on? (Didn't test because there is no easy way to get to connection). Any ideas would be helpful. Thank you.

Answer
Hi Bill,
Those drain plug(s) are definitely shown in the Chrysler shop manual for '94 that I have, specifically on the right side of the block at the very rear of the block, either at the level of exhaust manifold-to-pipe connector or just above it, depending upon which engine you have. It is called a core hole and its main purpose is to provide a place to position an accessory block heater. I suspect that it looks like a plumbing system pipe end sealer plug and has a bolt/screw in the center which if loosened will release the tension on the expandable rubber sealing plug. I am not certain if there is also one on the left side of the block. It might help to pull this plug(s) for flushing purposes but the manual doesn't suggest it in the flushing instructions.
On the fans, they are controlled by either turning on the A/C or by the coolant temp sensor reaching thresholds to turn on one or the other fan. If the fans don't come on when you activate the A/C then they also won't come on when the coolant temp asks them to. So there is probably a failure in the current supply to the relays that control the current to the fans, or the electrical signals to activate the relays. The power for the fans come off a 20 amp fuse in the power distribution center under the hood (behind the battery).  The fuse is red and is the second in line from the front, on the inner row of 5 fuses in the double row array of 10 fuses. So see if that one is blown or has a subtle crack in it. The fuse sends power to the high and low speed fan relays and the A/C clutch relay on red/light green wires (pin B of the relays) all located in the power distribution center. So if there is power at those three pins, then if the powertrain controller is working properly those three relays should send power on to their respective devices when called upon. However there is also a fuse in the under dash fuse box that must be patent to provide the power to operate the coils of the three relays: it is a 10 amp fuse located in the lower right hand corner of the maze of fuses. It might be labelled for that purpose, or be called F18 or be between pins 39 and 40. I don't have a vehicle nearby to look at for labelling issues but others have told me the numbers I call out from the wiring diagrams don't seem to relate to the actual situation in the box. In any case this is the right most fuse in the bottom row of 7 fuse sockets. So make sure that fuse is patent also. If both the fuses I have described are good then the A/C clutch and the fan relays should work when called upon, unless there is a common mode failure to provide the grounding of the actuation coils which is the responsiblity of the Powertrain control module. So let me know if none of the relays work and yet the fuses are good.
Roland