to do a good flush 1 drain water 2ad a box or bottle of cascade YES cascade dish washing powder or liquid i like using the liquid better.fill rad. back up and make sure its full after motor warms up.and drive it for a day or two.3 drain take thermostat out. with it out and cap off rad.put water hose were the cap goes turn on water and you will see stuff come out that you never that was possible.run water until clear.put it back together (be sure to run heater will doing the flush) this work better than any thing you can buy it will clean your hole system.and i would say that system is clogged up and pushing out water.just trying to help im sure you will hear different ways but this is the cheapest way i have found and does a better job.
