can you help me solve a coolant issue
when the truck reaches operating temperature, or even just driving after thirty minutes. the truck doesn't overheat, but when I stop and turn it off, coolant starts bubbling inside the reservoir, and shooting back out. there was sludge inside the reservoir and through the hoses, I flushed all the coolant and sludge out, cleaned all the hoses. multiple times. I cannot figure out where or what the problem is that makes the coolant shoot back out of the reservoir