Hello everyone, post #1 for me. I have coolant bubbling when I throttle my Tacoma. Radiator cap is off, coolant is cold, but when I rev up the motor a bit, bubbles come up to the surface of my radiator. Is this a head gasket issue? Has anyone else experienced this and just left it alone? The truck seems to run fine, but if I need a head gasket I'd rather not wait for a catastrophic failure. 1996 Tacoma 2.4L Thanks everyone!