Originally Posted By: swirlparanoid
Originally Posted By: RamFan
I don't know what you are considering a "power flush"? The flush machine we use in our shops simply uses an air hose to build pressure. Basically the air hose connects to the machine, the machine has a 1'' hose connected to an adapter that sits on the radiator or reservoir (depending on the system) and uses the air to create a vacuum and suck the fluid out. It isn't powerful to say the least though, typically the pressure will build to about 20psi. Generally we can extract about a gallon and a half on the low end, depending on coolant system size and type that number will obviously fluctuate, on the high end I've seen almost four gallons extracted.
I would prefer to take the lower radiator hose off and drain that way but using the machine is quicker and creates zero mess, which in our industry is crucial. The last thing you want is a surprise EPA visit while coolant is pouring all over the floor.
Oh i was under the impression that the flush machines at shops forced and agitated the old fluid with cleaner etc. From looking online it looks like most of them are just big vacuums that suck out old and put in new. Guess there really isnt a point in doing that then.
It removes the crud from it, but it can be done at home for cheaper.