panelguy

Hello , yesterday we installed a new aluminum rad 3 core and a 16" puller electric fan and a new thermostat on my sons 69 Mustang 351 w .It's running hotter than before .We're wondering if the fan is not enough pull for the three core or what the heck is going on . Any of you guys had problems like this ?
Thanks
Gary

88 orangepeel notch

I'll assume you mean it's running hotter during normal "steady cruise" driving. The fan has nothing to do with cooling in that instance. Air in the system ? Worn out lower radiator hose that's collapsing ? Or the water pump going bad ? Incorrect thermostat ? Faulty thermostat ?

Now if it's getting hotter in park, idling ? Then the fan might not be big enough, air in the system, faulty or incorrectly installed thermostat.

Good luck, and post back with what you find.