Q: Bubbles and pressure in the overflow tank

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I purchased the truck Wednesday I have had to put 3 gallons of antifreeze in it and see air bubbles in the coolant tank. And seems to have excessive pressure. Not sure what the temperature is because the gauge don't work. Is this a head gasket issue or what. Have seen no leaks

My car has 196000 miles.
My car has an automatic transmission.

If the coolant level was low due to a leak, such leaks can be found during a leak diagnostic with simple pressure testing. If the cooling system doesn’t maintain pressure, and no external leak is visible, coolant could be leaking internally. Alternatively, you can perform a chemical test for exhaust in the coolant to determine if there is a head gasket breach (although block and head cracks can cause leaks, too). If you desire that this problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine overheating diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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