4A-GZE MK1 Engine Bubbling Brook

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Hello All, I was hoping someone could shed some light on why, when warming up my car (89sc), I can hear water/coolant passing under the passenger side floor. Once I start the car from cold or hot, if I press the gas pedal a little I can make the sound appear. It sounds like a trickle which turns into a swooshing flushy sound with input from the pedal. I am quite sure it is in need of a coolant flush/fill but I just wanted to check to make sure it