Have Ford Questions? Ask a Mechanic for Answers ASAP
Thank you for asking your question on JustAnswer.
The cooling fan on your 1999 is controlled by the PCM (computer) by turning the cooling fan relay on. Is located in your under hood fuse panel. You have 2 relays and a fuse you need to check
That being said, you need to install a thermostat as it will cause more problem then it will help by leaving it out.