No. Nothing regulates the pressure. The cap is more a safety valve.
The thermostat is set to a specific tempeture. If the system exceeds the tempeture, the cap provides a release. The reason for the pressure cap is to prevent the hoses from blowing. The system tempeture to some extent determines the pressure rating for the cap. Water boils at 212F normally. At 5psi it may be up around 225F. At 10 its like 250F.
So if you are GM and want the engine to run at 210F under normal conditions, you need the additional tempeture surge room (normal fluctuations caused while driving). By using a cap that rated at 10psi, you can spike the temp to 250F without it boiling over.
Down side is when it goes, it really blows. As the pressure has gone away, All the water in the system boils almost instantly.
Keep in mind this is for a properly operating system. If you have a compression leak, the system would eventually build up enough pressure to cause it to pop.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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