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Old 07-10-2009, 03:41 AM   #1
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Flushing

So yesterday I noticed that my coolant tank was empty and that there was brown sludge on the bottom. I plan on doing a radiator/engine flush. Now I have read about two methods. The first one being that you refill the radiator with water then let it idle and then re-drain it. The second one is you leave the drain open and you just stick a hose in the radiator. Which one is the most effective? Also is there any good alternatives to the mopar moat they recommend.

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Old 07-10-2009, 06:02 AM   #2
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Ericl, I find the best method is to drain the radiator, refill with water and drive around awhile and repeat until water drains clear. The problem with flushing a radiator is the thermostat that closes when cold water is added to system and enters the engine block. driving around heats it up faster and opens the thermostat to circulate the entire system. also you have to turn on your heater to flush the heater core.

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Old 07-10-2009, 06:17 AM   #3
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EricL, The store bought flush has you drain the radiator then fill with their "flush" then run it untill warm then drain it again and repeat untill clean. I just did mine it was also like mud. I went by the instructions about three flushes then pulled one heater hose and the lower radiator hose off and ran water through everything. you also could pull the thermostat out before doing any of this and get a better flush (remember to put the thermostat back or better yet put a new one in) The overflow tank also lifts right off and you can scrub that out. my 2cents.
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Old 07-10-2009, 07:30 AM   #4
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Take the top heater hose off, stuff your garden hose in the end and crank it up.
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Old 07-10-2009, 08:56 AM   #5
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okay I'm probably going to pick up some flushing fluid + anti-freeze today at pep boys. Thanks for the advice. I think I might just drain it, add water, drain it (total of 3 cycles).

Okay just opened up the cap, and saw it was green inside the radiator. not the brown like in the overfill bin (which only had like 1/3 a cup of fluid in). Is it okay for now to rinse out the overfill and add some distilled water? I suspect that when they sold me the car, they just added coolant directly to the radiator and didn't even bother with the overfill and that brown gunk is left over from before they did that.
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Old 07-10-2009, 02:37 PM   #6
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Sorry to double post, but I can't edit. I decided to flush the whole system. I bought Pro Line Original Green anti-freeze at pep boys. I was just wondering is this a good brand? There was no mopar hoat.
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Old 07-10-2009, 02:49 PM   #7
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Just remember that if you have to add your own water to the antifreeze (some are pre-mixed to 50:50), to only use distilled water. Grocery stores sell distilled water for around .50 per gallon. Using tap water in a radiator will likely cause the radiator to eventually start clogging up with hard water (calcium/disolved mineral) deposits.
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Old 07-10-2009, 02:57 PM   #8
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Yeah I know about distilled water. It's okay to use tap when to flush right?
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Old 07-10-2009, 04:20 PM   #9
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Quote:
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Take the top heater hose off, stuff your garden hose in the end and crank it up.
thats how i do it as well,
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Old 07-10-2009, 04:48 PM   #10
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Yeah I know about distilled water. It's okay to use tap when to flush right?
No problem, that's how I do it too.
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Old 07-10-2009, 05:34 PM   #11
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This is the plan, tell me if there is an error or not.
1. Remove radiator cap, open bottom valve and drain fluid. Dump/clean overfill tank.
2. Detach top heater hose, then clean radiator with water hose , letting the gunk flow out from the bottom.
3. Attach top hose, fill tank with water, then idle. Wait for cooldown, then repeat step1.
4. Fill with 50/50 coolant, then idle. Wait for cooldown. Open radiator and fill again to top (for air bubbles). Add coolant to the overfill tank.

Step 3 doesn't have to be used right? That proline should be good right?
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Old 07-10-2009, 10:50 PM   #12
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To get the air bubbles out I run with the cap off that will get the air out. Then in a 5 mins or so put the cap back on. Instead of buying water when you can just heat up tap water to boil then bam distilled water!! Also cheaper too!
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Old 07-11-2009, 12:53 AM   #13
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heating up tap water to a boil will not distill it
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Old 07-11-2009, 12:54 AM   #14
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heating up tap water to a boil will not distill it
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Old 07-11-2009, 09:41 AM   #15
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heating up tap water to a boil will not distill it
X2, boiling only sterilizes it. Distilling water does involve boiling it but the actual distilling process takes the escaping steam off & then cools/condenses it so the condensation drips into a second container. That process produces pure distilled water, leaving the mineral deposits behind in the first container.
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Old 07-11-2009, 10:38 AM   #16
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Yeah you need collect the steam for distilled water.

Right now I'm trying to find the engine block. What is another way to flush out this area? Removing the bottom hose?
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Old 07-11-2009, 10:53 AM   #17
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Right now I'm trying to find the engine block.
It's that real big thing right in the middle of your engine compartment with all kinds of wire, hoses, & stuff on it.

j/k Yes you can flush it by removing the lower radiator hose.
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Old 07-11-2009, 10:59 AM   #18
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It's that real big thing right in the middle of your engine compartment with all kinds of wire, hoses, & stuff on it.

j/k Yes you can flush it by removing the lower radiator hose.
Alright, so I finished flushing it, I detached the lower hose + upper hose and washed out the radiator. I plan on now, filling it up with water, then drive it around for 5 minutes, letting it cool, then re-drain and adding my 50/50 coolant. It should be around 2.5 gallons to fill right? because I have only 1 gallon of pure anti-freeze right now and I might need to get some more.
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Old 10-10-2010, 09:31 AM   #19
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New jeep sludge

Ok, I bought jeep with 209 miles from dealer. After Dealer service (they ok'd fluid level) noticed overflow was at min with BAD looking and lots of solid matter fluid. Suctioned that out, added new, didn't flush, remote area, not enough replacement fluid, buyt am wondering what causes a brand new jeep to have so much crap in the fluid???
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Old 10-10-2010, 06:16 PM   #20
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look at my today as well and looked rusty more then muddy. just flush out the old and in with the new?
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Old 10-10-2010, 06:20 PM   #21
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looked at mine today. looked rusty more then muddy. same problem? out with the old in with the new?

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