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Sounds like a bad thermostat. If the thermostat is not working, the system doesn't know the real temp of the engine and things like the antifreeze and heating system work wrong or don't work at all. Take it to a mechanic to check things out.
Add a mixture of one-half water and one-half antifreeze to the radiator. Fill it right up to the top.
Fill the overflow/coolant reservoir with the same 50/50 mixture.
Leave the radiator cap off, turn the engine on and let it run until the radiator "burps": You will see the coolant level drop and may see or hear a large air bubble come to the top as the system burps.
Keep an eye on the temperature gauge throughout this process.
Refill the radiator to the top and coolant reservoir as needed.
Put the radiator cap back on.
You might have some air inside coolant system, try follow the steps that i just created. if its not work out please relay me back thanks
temp should stay about half while driving sounds like you have a bad thermostat if guage is half way at idle do you have heat feel both heater hoses should be about same temp if one is cooler not flow coolant
i wonder if possibly a defective thermostat, that it is sticking open. to bench test thermostat place in a pot,if you have a candy thermometer all the better ,place in cool water and bring to boil checking temp.it should open alittle at a time until being fully open at what ever temp it is rated at then slowly add cold water and it should close in a similar fashion
Start with engine cool, & remove radiator cap. Check level in rad & fill to an inch or so from top of rad. Start car & turn heater on.(not defrost) Now let it run until engine gets up to normal operating temperature & let it run until rad fan comes on & off, 2 or 3 times. Rev engine slightly every so often just to help disperse air in system faster. Fill rad as needed during this time. After you do that, and fan has come on & off 2 or 3 times, put rad cap back on & fill return bottle to proper mark, then see how it is. I suspect it's just air in system & this should cure that . If not get back to me.