Re: 2002 Ford Taurus 3.0 overheating?
Number 1 is that's not 3.0L SOHC engine you posted in the pic. That's a 3.0L Vulcan pushrod engine Ford has used in different vehicles since 1986. Since you mentioned the PO put stop leak in I would pressure test the system and look for leaks. Look for signs of leaks other than what's being blown out of the coolant reservoir. Check the simple things next. Check the pressure cap, thermostat and cooling fan operation. Make sure the cooling system and the radiator isn't plugged. Have someone with a scanner check it for codes related to the cooling fans and overheating. When you unplugged the temp sensor you probably set a memory code in the system so you can disregard that. Also when you run the test for codes the cooling fans should run briefly during the test. If they don't it should set a code pointing towards the fan controller. Some Ford dealers have a stand alone tester that will test your fan control module off the car. Although I've seen head gasket problems with that engine, check the simple things first.