Overflow tanks often turn brown over time. I don’t think that alone is necessarily cause for concern.

Radiators often have a separate section for transmission cooling. You’ll see two transmission lines that hook up to the back of the radiator on the bottom, and those are used to cool the automatic transmission.

You could try cleaning out that portion of the radiator, or try replacing the radiator if you think your radiator is having issues.

try out bars stop leak head gasket sealer…follow instructions…do remember to flush out the old coolant and add new….instructions are easy ,also has addives that run coolant temperature down as the molecules inside it increases the heat transfer rate

It’s probably a blown head gasket. Engines don’t like to be overheated repeatedly. It is very likely to damage something expensive. It could be something else, but it’s probably something else that’s also expensive.

You could ask him to do a leak down test to see if you can confirm that it’s a blown head gasket.

Have you checked your radiator cap?

Could be, but I would do a leak down test to see if you are getting combustion gases in the cooling system. That could be a sign of a bad head gasket. You could also try a combustion leak detection kit if you want to a slightly cheaper and easier route.

your thermostat might be stuck open. take off the inlet housing remove the thermostat and replace the housing without the thermostat. fill with water to see if it circulates without it in. if not maybe water pump. However unless you’re going to fix it yourself it’s better to take it to a mechanic I found myself working on mine and it became much more complicated than I thought originally still dealing with it.

Hi I replaced the thermostat and water pump and it still over heats Could the radiator be bad