After driving my 84 Vanagon I notice coolant coming from under the coolant expansion tank cap.  I'm not sure if the van is running hot or not.  The water temp gauge doesn't work well all the time.  The cap is on tight.  I just replaced the coolant and refill tanks and caps, new thermostat, coolant,  and bleed the whole system.  Is the cap supposed to open and close to allow for a pressure release?  Could I just have a bad cap?  Any thoughts would be appreciated.  Thanks, Jeff

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