BMW E46 320i M54B22 - High Cooling System Pressure, Radiator Replacement & CO2 Test Results

I warmly welcome,
I took the car from Germany, returning to Poland with zero problems, when I returned it blew up the radiator and there was a puddle under the car. The mechanic installed a new radiator and decided (because these internal hoses were swollen) that pressure was coming from the head. They did the Co2 test and the color changed fluid.
I will add that there are no other symptoms of a damaged gasket under the head, it does not kick, it fires without problems, there is no oil in the coolant or water under the oil filler cap / bayonet.
Before I decide to spend money on renovation, I would like to make sure that it is 100%. Is there any other symptom that could cause excessive pressure in the cooling system and the above-mentioned effects? I don't have LPG.
E46 320i
M54B22

Greetings.

It can be a head, but if you have doubts about the mechanic, buy a tester, for example ... or drive to another specialist. It happens that these German cars bought straight from the Turk or Lithuanian have such bonuses and sellers blow the thermostat away so that the customer goes away.

Smule wrote:

Is there any other symptom that could cause excessive pressure in the cooling system and the above-mentioned effects? I don't have LPG.

And what to add here, the color detected CO2 you have pressure, what else do you need?

Ok thank you for the answers.
I have little doubt about this diagnosis, I have not seen this test for living eyes.
The car drove 1000km and everything was fine.
A few days later another 100km, no loss of coolant.
Then the car stood and during the parking under the house the water light came on ...
I look and there is nothing but nothing, I added, the next day I look and again little, the water ran away very quickly at a standstill. And the diagnosis in the service - a blown radiator.
I did not heat the engine even once.
Is it even possible for the radiator to go like this?

No, just like that ... you have a blow to the cooling system, a few more days of such experiments and you will be looking for an engine.