Does the steaming at geothermal fields act as a safety valve for the volcano?

No, it does not. The Sulphur Springs area in Saint Lucia, for example, includes over 20 hot springs and steam vents. Contrary to popular belief, these do not act as a “safety valve” to reduce the likelihood of an eruption. The steaming in this area is generated from heated rainwater, which comes from above the Earth. It does not indicate that the volcano is “letting off steam” or reducing pressure.