06 2.ot coolant tank overflowing

Coolant level was at cold line level , started , drove around the block and the coolant level went all the way full on the tank , and I can hear some coolant "burbing" around the coolant temp sensor , bad thermostat ? engine temp at normal ( half way line ) or something else?

Any number of things from coolant cap at the highest point, to the water pump at the lowest point and multiple points in between. When it cools down start checking the simple stuff first. Pull the coolant cap and give a good once over, if it looks bad it is bad, if it looks good it "should" be.

You haven't had the car very long and you don't know if the previous owner ever used a stop leak product so you will be replacing the thermostat, it would be foolish not to and if it's scummy, you will need to pull and check the temp sensor. The messy way to replace a thermostat will answer a lot of questions so don't drain coolant from the bottom of the radiator, chuck a big pan under the car, pull the upper hose free from the radiator first and you will know real quick if you have a big air pocket or if your radiator is full to the top. Then point the hose to the pan and drain all the coolant off the top of the thermostat, then pull the thermostat and look down the hole. If you had coolant above and not below, odds are good that a new thermostat and coolant fill will be all the fix you need.

You can save some time burping the system by topping off the engine block through the open hole before you install the new thermostat and pouring in as much coolant as you can to top off the radiator and fill as much of the upper hose that you can before you slip it back on. Then start the engine, turn on the heater and check the heater hoses at the firewall to make sure they both get hot while you are waiting for the new thermostat to open. If they don't get hot you could have a bad heater valve and do check that before you tear into the water pump. After that add coolant when the thermostat opens and hope for the best.

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Originally Posted by Digger

Any number of things from coolant cap at the highest point, to the water pump at the lowest point and multiple points in between. When it cools down start checking the simple stuff first. Pull the coolant cap and give a good once over, if it looks bad it is bad, if it looks good it "should" be. You haven't had the car very long and you don't know if the previous owner ever used a stop leak product so you will be replacing the thermostat, it would be foolish not to and if it's scummy, you will need to pull and check the temp sensor. The messy way to replace a thermostat will answer a lot of questions so don't drain coolant from the bottom of the radiator, chuck a big pan under the car, pull the upper hose free from the radiator first and you will know real quick if you have a big air pocket or if your radiator is full to the top. Then point the hose to the pan and drain all the coolant off the top of the thermostat, then pull the thermostat and look down the hole. If you had coolant above and not below, odds are good that a new thermostat and coolant fill will be all the fix you need. You can save some time burping the system by topping off the engine block through the open hole before you install the new thermostat and pouring in as much coolant as you can to top off the radiator and fill as much of the upper hose that you can before you slip it back on. Then start the engine, turn on the heater and check the heater hoses at the firewall to make sure they both get hot while you are waiting for the new thermostat to open. If they don't get hot you could have a bad heater valve and do check that before you tear into the water pump. After that add coolant when the thermostat opens and hope for the best.

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Thank you for your advise will do exactly like that , looks like the coolant mixed with ATF its pink color