So the upper radiator neck is leaking, I tried to seal it with some solder but that didnt work, its leaking on either side of the tank, and when I look inside of the radiator I found a 1'' by 1'' piece of metal just drifting around. I bought a new radiator, but wanted to know what kind of radiator flush you guys use if any.

 

AS far as products, I would use plain water with a Prestone flush kit.

If you were to use a strong detergent it might actually loosen sludge and plug something up like the heater core.

SO, I usually just use a garden hose and a flush kit

 

Well I bought the Valvoline version of the "super flush". It says to drive your vehicle 3 - 6 hours and then to flush with regular water. I replace the radiator tonight then just fill it up with this super flush and water and run it for a while then flush that out and refill with clean fresh antifreeze.

 

IF you use tap water with the Superflush, make sure to drain ALL that out, and add distilled water with coolant to the proper mixture.
I stress getting as much tap water out as possible, because it contains minerals and stuff that leads to problems in the cooling system.

 

Will take many (5) times of filling, running, then drain before you get all of it out of the block. The thermostat hinders flushing the block. When i drain mine I always just pull off the botton hose at the radiator. Also while doing the above run the heater.

 

ahh hell... I just waited till summer and dropped all the coolant and re filled it with hose water. Drove it around for a bit with the heat on, windows down and the radio up, all while wearing a dirty white tee shirt with a pack a bros rolled up in the sleeve and an old mil on the dash. Drained it, re filled, drove, drained, re filled, drove...etc.

had to drain and fill with water like 6 times before I got clean water to come out.

I then used pure coolant to re fill (as there was still alot of pur water in the block) and drove for a week before I tested the coolant and added accordingly for a proper mixture.

 

I bought 8 gallons of disstilled water yesterday. Filling it up with that and the flush. I will drive it around for a few days as I only live 4 miles from where I work. Then drain it all and refill with more disstilled and coolant.

I am trying to decide what the best method is to get all of hte gunk out if there is still more in there but dont have enough disstilled water.

 

pop out all the freeze plugs and get and angled head pressure washer.