if radiator was just put in and refilled you may need to get air out of the hose lines to get the water to circulate. some late mod cars have a vent port on the area near the t stat. or goose neck. i have been able to squeese the hose some and get it moving . check the temp of the hose after the engine is running some dont let it run too long or get too hot. you might check with manufactor service dept. for that perticular model.
Ingeneral, the fan will run only if the temperature of the radiator is above the normal range. If the fan is running, then the radiator must be over temp unless the radiator fan thermostat or it's relay is defective. If the radiator truly is over temp then you have a larger over-heating problem You state the thermostat was replaced. if you replaced the fan thermostat then either the radiator really is over temp and it is doing what it should, or there is a problem with the thermostat-fan relay or switch. If you replaced the engine thermostat that controls the flow of coolent between the engine and the radiator, then that probably wasn't your problem and you should look elsewhere for an overheating cause. I would start by determining if the engine actually is overheating or not. If it is, I would look for coolent system problems like the engine thermostat (if you didn't replace it already), water pump, leaks, scale build up in the radiator, or blockages in the system. If the engine isn't overheating then I would consentrate on the fan, fan thermostat and relays.
There are a few more things you can try, get a new radiator cap. These come in different pressure sizes as do thermostats. A thermostat comes in different temperature ranges, maybe yours is too high or low for your needs. Make sure your fan is operating properly. If all of this fails, maybe you need to have your radiator cleaned (flushed) to open clogged areas used to cool your engine cooling fluid.
If you replaced some of theses already ignore and go down the line # Not enough coolant # Water pump drivebelt defective or out of adjustment # Radiator core blocked or grille restricted # Thermostat faulty # Electric cooling fans blades broken or cracked # Radiator cap not maintaining proper pressure # Ignition timing incorrect
It could be as simple as the radiator cap or as serious as a leaky head gasket or intake manifold gasket (GM V-6). Other possibilities: bad temperature sensor or electric fan, bugs and dirt on outside of radiator, plugged radiator, wrong coolant mix (use 50/50 water/anifreeze), plugged catalytic converter (would also affect performance). If you suspect thermostat, replace it, do not just remove it. You've already mentioned water pump and radiator.
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