I think I'd figure out what's wrong with it before making a decision to repair or replace. If the cost to repair is <50% of the cost of a new one I'd consider repairing it if it is in decent shape otherwise.
It may be as simple as a bad thermostat, relay, switch, loose wire, etc..
2006 23B Hybrid with 10k round bar WDH
2011 F150 4x4 SCREW Ecoboost, Max Tow, Integrated TBC, 3.73 LS axle, Firestone Ride Rite airbags.