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Old 09-22-1999, 03:22 PM
Posts: n/a
In the top hose there shouldn't be much pressure built up at all. The radiator cap won't allow pressure in the overall cooling loop to exceed about 15 psi (about 1 bar.) If the thermostat is opening, the upper hose should feel hot to the touch.

I suspect your thermostat is opening, if it wasn't the engine would overheat in a short time.