No, this is somewhat how they work ( borrowed from Wikipedia):
An example of a cold-water carbon dioxide driven geyser; geothermal activity does not play a role in the activity of the geyser. The ground water near the geyser has significant quantities of dissolved carbon dioxide, along with substantial underground gas accumulations in the surrounding area. Saturation of the aquifer with CO2 creates enough pressure to force groundwater through the geyser and out on to the surface.
Between eruption events, the water level is below the surface of the geyser—at the level of the water table. In the preface to an eruption, water surfaces, fills the pond around the geyser, and begins to bubble. Bubbling events occur with increasing frequency in the time leading up to an eruption, but are not constant; bubbling events last for a few minutes, with a few minutes of calm in between. Bubbling events at the main geyser also frequently alternate with bubbling events at natural side-pools.