I had the same problem with my 99 ford taurus. My ford taurus did exactly did same things that your vehicle is doing. runs cool on the freeway because the air is going through the radiator and cooling the water down.I checked the cooling fans, radiator and hoses for leaks also replaced my thermostat. nothing solved the problem. turns out that the new antifreeze does not come with a lubercant property any longer. you have to buy the lubercant additive separately and then add it to your cooling system when you replace the antifreeze. the lubercant protects your freeze plugs, water pump, radiator, thermastat from rusting out. Meanwhile because of the absents of the lubercant, my water pump impellers rusted out and dissolved. so the water pump had no fins to circulate the water. Luckly for me, I discovered that my car was still under warranty due to an extended warranty I had purchased when I bought the car. ford dealership replaced the water pump. Problem Solved.
SOURCE: Over-heating Ford Taurus!!!
Sounds like a stuck thermostat no heat water not circulating to heater core engine overheats stuck thermostat won't let water circulate through engine
SOURCE: 2003 Ford Taurus wants to die when coming to a stop
TRY THIS AND LET ME KNOW IF IT CORRECTS YOUR PROBLEM
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
SOURCE: 2000 Ford focus se wagon overheat
you may have a stuck thermostat,if all fans are working then just flush out radiator and replace
thermostat.check for any coolant leaks and check coolant level after few days
SOURCE: 02 taurus stalls when driving normally @when slowing for stop
check for vacume leaks most common problem for symptoms listed its hoses on engine look for dryrot cracked, or broken hoses or lose come off
SOURCE: 2003 Ford Taurus, 90K, used car, engines shakes, ABS goes on
Are you getting any codes from the Check Engine Light? This sounds like it could have something to do with a sensor. Check your air filter and make sure it's clean. The tach on my 1999 doesn't really work, but it hasn't coincided with other driveability problems. The engine doesn't change in it's RPM's, the tachometer just stops working. Have your charging system checked. The shaking might be coming from bad fuel pump operation, clogged fuel filter, or dirty fuel injectors. Try putting an additive into your gastank to clean the injectors (a bottle of Seafoam is great for this). Try calling your local Autozone and see if they do free trouble code scanning. This might help lead you in a better direction.
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