You guys have me re-thinking the drain-plug... Anyway, I drained from the radiator today and what came out was ORANGE and not very brown. Closest thing to describe it to would be buffalo sauce.
Before anyone asks, I have never put DEXCOOL in it.
I filled it up again with just straight water, let it heat, and dropped it again. I'm gonna repeat this process tomorrow (when I have more time) until it gets a clear as it gets. Then I plan to run the Prestone flush.
There is a LOT of residue caked to the filler neck on the radiator, it's really tough and I worry that if this stuff is whats coating the radiator (of course it is) Prestone won't be strong enough. At that point I'll use CLR.
With a dry radiator, how much coolant sits in the block?
Yeah, that drain plug has to be almost welded in with rust/corrosion and don't think I'd mess with it.
I've seen coolant/flushes come out real orange and believe that's just the rust in the system rather than an additive. Sounds like you're doing it right by flushing w/water 1st and then go with a fast flush or CLR. If I'm not waiting for the block to cool down all the way before I run another batch of water through it I'll add hot water with a garden watering jug so I don't shock the block/system with real cold water.
If you have that much rust in the rad so it's caked in around the inside of the filler neck I'm surprised it hasn't been running hot or overheating. I just replaced my OE rad last year on my 96 4.0 when it developed a leak near the top seam. Even still had the Chrysler sticker on the plastic side and surprised it lasted 16 years.
Not sure how much liquid is retained in the block, heater core, hoses, etc, but don't believe it matters since you're flushing it. The FSM only gives refill capacities rather than complete cooling system capacity. Refill for the 4.0 w/standard cooling system is 9.3qts (8.8L) and for the 4.0 heavy duty cooling system it's 10qts (9.5L). HD cooling system is indicated with a trans cooler in front of the radiator which comes with the tow group.
Hopefully you have your heater set to high when flushing the system so it goes through the heater core. Also helps to back flush the core and disconnect your hoses at the front/right of the valve cover rather than possibly damaging the soft copper tubes coming out of the firewall. When I replaced my AC evaporator I also replaced the heater core and while I was trying to be careful I could not get the hoses off of the core w/o bending or half-crimping these soft copper tubes. Didn't matter since was replacing the core anyhow.
When you finally add the coolant to the system buy the pure anti-freeze concentrate. Then buy a gal of distilled water (no minerals/calcium) and mix it 50/50. I use Prestone and mix it in another empty gal jug then mark them 50/50 so I know it's pre-mixed. Good luck!
So he just pumped everything in his cooling system onto the driveway? I wouldn't do that if I were you. Will anything happen? Probably not but should the wrong person see what you're doing and you'll get hit with some pretty hefty fines.
Agree, that video is a pretty poor example of disposing of the coolant or a flushing additive! Wouldn't doubt any type of acidic flush/with rust could stain concrete for a while too. Big time fines if going down a storm sewer drain.
It's interesting the Fed/State EPA's recommend pouring used anti-freeze down your drain/toilet and to dispose of it. This is only for residents on a municipal sewage system, not for septic-type systems, and the antifreeze is supposed to be watered down enough where it won't harm anything. Imagine you're supposed to do the same with an used acidic flush additive since know of no other place which will take it to dispose of.