Here is an update....
My son, took the car to a local Ford dealer for the fix and they charge $100 diagnostic fee and did nothing to fix the problem. It appears that there is a electrical short due to brittle wire which is causing the COOLING FAN TO NOT RUN. Fan has not been running for a while as there are rust signs on the fan itself to show that. I guess the car could run without the cooling fan as long as you are not in traffic.
They could not find exactly where the short is and since it is the general area where car body work has been worked on, they are not going to continue with the repair. As a result, my son paid $100 to the dealer and picked up the car.
Dealer, however, suggested to install a manual switch to turn on/off the fan and use the car that way. I am not sure if that is the best solution nor the only solution.
This sort of problem, I am sure is not an isolated problem as I know the wiring for this vehicle is a problem. If anyone has experience the same problem and found a genius solution, it would help me and may be other owner of this vehicle who is struggle to keep it alive. Thanks in advance for your reply.