Hi I hope someone can help. I have a 93 Sporttrack/feroza 1.6lt fuel inj, It overheated the other day after blowing a radiator cap, mechanic placed a new thermostat in but since the occasion the temperature gauge now fluctuates wildly but not over the proper temperature. I have replaced the radiator cap with a new one just to make sure it wasn't that. Any other suggestions would be greatly appreciated.

Kind Regards
Xeb