radiator flush - JeepForum.com

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post #1 of 20 Old 01-10-2008, 11:53 AM Thread Starter
shepdogwv
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radiator flush

Hey all, I'm tryin to get the radiator flushed in my jeep today and I've found the radiator drain behind the light and the drain on the engine block, does anyone have any tips on getting these off? I was able to get the radiator drain out fairly far but decided that I didn't have enough time to do the whole thing so I stopped, but I'm at a loss on how to get the drain out of the engine block. Does anyone know what type of tool I need to get it out, or is it really a big deal if I get it out or not and just drain the radiator. Thanks for any help.

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post #2 of 20 Old 01-10-2008, 12:01 PM
88XJSport
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Pull the lower radiator hose for faster easier radiator draining.
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post #3 of 20 Old 01-10-2008, 12:06 PM Thread Starter
shepdogwv
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Where is that and how do I tell if from all the other hoses haha.
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post #4 of 20 Old 01-10-2008, 12:08 PM
Texsun
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It goes from the bottom of the radiator up so just un clamp it and let it POOR OUT

estimated time for removal - 30 seconds
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post #5 of 20 Old 01-10-2008, 12:51 PM
ehall
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Get a sawzall and cut part of the fiberglass out. Here are some pics from my 91.





and the piece of scrap that was removed



There are some wires back there that you need to watch out for but you should be able to find them all and hold them aside.

I drained mine three or four times when swapping thermostats and whatnot and the petcock is nice to use.
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post #6 of 20 Old 01-10-2008, 01:24 PM
toates89
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you are supposed to take the plastic grill off(only a handfulof screws) then choose the correct tool
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post #7 of 20 Old 01-10-2008, 01:43 PM
lifted92xj
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why cut up your jeep when you can pull the lower hose. if hes just flushing the radiator theres no need for all of that work

big lift, sick tires, awsome accessories, alot of custom work.

my jeep won the war, your honda mows my lawn
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post #8 of 20 Old 01-10-2008, 02:20 PM
AZ Jeff
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Quote:
Originally Posted by lifted92xj
why cut up your jeep when you can pull the lower hose. if hes just flushing the radiator theres no need for all of that work
It depends on what kind of flush you want to do. If all you want to do is dump the old coolant, and put in new stuff, the rad hose removal works fine. It's messy, but it's fast.

On the other hand, if what you want to do is a "RUNNING FLUSH", then having the lower rad hose off won't cut it. A "running flush" is where you drain the coolant, refill with water/flushing agent, and then start then engine. Then, while the engine is running, you open the radiator drain AND add fresh water through the rad. spout so as to maintain a full cooling system. Keep this flowing (and the engine running) until the coolant comes out of the rad. drain clean and warm. Once you are there, you can be confident you cleaned out ALL the old coolant and crud.

AZ-Jeff
I don't own an XJ any longer, but I still think they are the best of all the Jeep products ever made. My XJ was my favorite vehicle in my 50+ years of driving.
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post #9 of 20 Old 01-10-2008, 03:00 PM
nujeepguy
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I am so glad AZJEFF clarified this . i always think to myself what's the point of only pulling the lower rad hose when doing a full system flush. gotta run the full system in a constant cycle of continuous add and drain. well if you want a proper clean out anyways.
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post #10 of 20 Old 01-10-2008, 03:01 PM
glatt513
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AZJeff you are right, that is the way to really clean the cooling system and get the crud out. However, I easily accomplished this without taking a sawzall to my rig. It is easy to get your left hand up in there and open the petcock. If it is stuck, just push on one side with a crescent wrench (you will never get a pliers up in there) to loosen it. Mine had not been flushed in many years (evident by the horrible hoo-hah that came out - almost like a colon blow! ) and it was still able to get the petcock loose pretty easy.
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post #11 of 20 Old 01-10-2008, 03:01 PM
dirtdad
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radiator flush

Preston makes a flush kit. All you do is cut one of your hrater hoses, and clamp in a hose adapter that you can leave in permanently, to this adapter you hook up a garden hose, remove the radiator cap, start your engine, turn your heater to hot, turn on the garden hose, and fresh water is circulated thru the engine until you see clean water coming out of your radiator fill hole, works great, and you can do it whenever. Cheap too, around 8.00
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post #12 of 20 Old 01-10-2008, 03:16 PM
Rowingfish87
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How often are you supposed to change/flush your radiatior fluid?
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post #13 of 20 Old 01-10-2008, 03:18 PM
lifted92xj
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every 50k unless it looks like crap from offroading and whatnot

big lift, sick tires, awsome accessories, alot of custom work.

my jeep won the war, your honda mows my lawn
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post #14 of 20 Old 01-10-2008, 03:24 PM
1996xj
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If its really nasty looking i would try one of those flushing chemicals, I used it on a cherokee that had dexcool mixed. I used prestone flush and got the heater core unclogged.

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post #15 of 20 Old 01-10-2008, 03:33 PM Thread Starter
shepdogwv
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alrighty fellas, I pulled the drain plug (while leaving the pressure cap in place) but it hasn't drained the fluid out of the reservoir bottle. How do I get that stuff out of there?


P.S. I'm running some prestone super flush through it and also using prestone extended life antifreeze? will these be ok?
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