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i have a b18a1 in a 92 hatch. recently its been over heating. it was going to 3/4 on the gauge then id shut it down. i replaced the thermostat and it doesnt really go over 1/2 now. but before and still after i replaced the thermostat the coolant going into the overflow tank would start to bubble and over flow. and when you turn the car off the all of the coolant in the overflow gets sucked out and its empty. i recently replaced the water pump due to the timeing belt breaking right after i bought the car but before it did blow it never did this. any ideas?