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I changed the thermostat, the fan clutch looks to be a little loose, but I touched the rad and it was still cold.
The car is sitting at an incline, is it possible that there's an air pocket somewhere and it's preventing the coolant from moving into the rad?
not likely, what is the coolant level like Jullian? Did you turn on the heat full blast?
I would open the rad, turn on car let it idle and warm, see how much coolant is in the rad cold and how much gets sucked up, turn the heat on full blast and see how much gets sucked up. Most likely youre just low on coolant, and need to add some. if the rad's level is low when cold and empty when the engine takes in coolant, youre definately low and need to add.
How old is the fan clutch? Don't try any BS tests with it, if it's not like a few years old, change it. And what do you mean by the fan clutch being "loose"? If you mean the shaft, if it has more than 1mm play your waterpump is dead/dying.
If it's not the fan clutch then it could be a toast HG. Check the dipstick for white froth, and the coolant reservoir for bubbling - it looks like this:
Air in the system, for sure! Let it cool off for a bit, level should go down, so add more coolant, repeat several times...its another way of bleeding the system...
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