Bubbles in the coolant overflow tank

The car is not overheating. I know I have to drain some coolant from the radiator, but the problem is that as soon as I start the car, the coolant comes out of the radiator. I kept draining for about a minute or so, and kept coming out more or less, so then I decided to put the cap on and do it on the overflow tank.

Some people suggested to start the car with the radiator cap on and let it run for a minute or until it warms a bit, and then remove the cap and it shouldn’t come out anymore!

Any thoughts on what should I do?

Thanks!

I checked the video you posted and at Step 3 (Test 3) it said to look for bubbles in the radiator cap. Mine is not like that. It doesn’t have a single bubble, it’s just the coolant coming out and spilling over.

Now even stranger things happening. I tried to do the test again. Now when I removed the radiator cap there was no coolant inside. I said okay, I started the car and now coolant didn’t come out at all, nothing inside. I don’t know if this is how it’s supposed to be or if I should see some coolant inside the filler neck. Anyway I put the tester on and was negative. I don’t know if I should add coolant to my radiator cap, because the coolant level in overflow tank is already to full.

Now I let the car run for a while and also didn’t see any bubbles in the overflow tank. I don’t know what to think anymore, I’m now sure what is normal for my car and what’s not. The car drives perfectly normal, no issues.