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Old 09-30-2010, 08:34 PM   #1
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someone walk me through flushing the cooling system

i wana flush my cooling system and would like some instructions from jeepers

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Old 09-30-2010, 08:45 PM   #2
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Buy a bottle of radiator flush and follow the directions on the bottle. That's what I do.

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Old 09-30-2010, 09:47 PM   #3
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Or, take it to a quick lube place and let them suck it out and refill it.
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Old 09-30-2010, 10:13 PM   #4
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There is a good video by Prestone on youtube.

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Old 09-30-2010, 10:22 PM   #5
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best way to do it is to take it to a quick lube place like cork said. We have machines that do it quickly and easily.
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Old 09-30-2010, 10:24 PM   #6
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Keep It Simple Stupid.

If you cannot find a drain plug at the bottom of the radiator.. Pull the hose exiting the Heater Core (the top one); Shove a hose down the radiator with the engine running, and Flush... Shut the motor off first, then the Hose.... Replace the Heater Core hose, and Fluid.....
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Old 09-30-2010, 10:30 PM   #7
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So what is the point of filling with regular Preston and then topping off with the Preston 50/50....? If there's a 50/50 blend then why can't I just use that from the get go?

When did sticking a garden hose in the top of the radiator to ensure a full flush occured change? Am I wrong on this...............? Please advise
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Old 09-30-2010, 11:52 PM   #8
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Quote:
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So what is the point of filling with regular Preston and then topping off with the Preston 50/50....? If there's a 50/50 blend then why can't I just use that from the get go?

When did sticking a garden hose in the top of the radiator to ensure a full flush occured change? Am I wrong on this...............? Please advise

Because if you truly flush your cooling system,no matter what you do there will be some residual water in the system. It will never all drain out. So if you add enough straight coolant for the capacity of the system when you top it off with water you will have a true correct mix. Now a lot of people just use the 50/50 pre-mix and never have an issue. I have done it both ways and never had an issue.
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Old 10-03-2010, 07:17 PM   #9
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I do not have the owner's manual. do we need to "bleed" air out of the system, as mentioned in the video, on a 97 4 Cylinder Wrangler?
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Old 10-03-2010, 11:26 PM   #10
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I do not have the owner's manual. do we need to "bleed" air out of the system, as mentioned in the video, on a 97 4 Cylinder Wrangler?

Best way to bleed it is fill the system, leave the radiator cap off. Start it and let it idle. As it circulates any air will burp out the radiator. Keep and eye on your fluid level as it bleeds itself out the level will drop some. Also don't worry if when it starts to get hot it actually spits some fluid out the radiator and then drops real fast that's just the system heating up and the thermostat doing its job. Let it run until you are adding no more fluid and the radiator is staying topped off.
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Old 10-04-2010, 10:11 AM   #11
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I usually flush it with the engine on, bottom drain open, heater on full blast, with the hose in the radiator.
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Old 10-04-2010, 08:34 PM   #12
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Quote:
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Best way to bleed it is fill the system, leave the radiator cap off. Start it and let it idle. As it circulates any air will burp out the radiator. Keep and eye on your fluid level as it bleeds itself out the level will drop some. Also don't worry if when it starts to get hot it actually spits some fluid out the radiator and then drops real fast that's just the system heating up and the thermostat doing its job. Let it run until you are adding no more fluid and the radiator is staying topped off.
Thanks Meyres,
Any other helpful tips? this is the first time i'll be replacing my radiator.
any tips would be greatly appreciated.

Thanks
Jeegar
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Old 10-05-2010, 09:18 AM   #13
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Thanks Meyres,
Any other helpful tips? this is the first time i'll be replacing my radiator.
any tips would be greatly appreciated.

Thanks
Jeegar

Forgot to add make sure your heater is on heat and high so the coolant is circulating there as well
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Old 10-05-2010, 11:27 AM   #14
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Thanks,

What happens if the bubbles are not out completely?

Also the temp needle on my jeep is acting a little weird.
when i am on the highway getting to the highway speed, it goes to almost the 210 line but comes back down to about 200 (more like on 2), the difference is not much but this didnot happen before my radiator started leaking. the leak is quite slow but i keep checking the levels in the tank every morning and evening, and my commute is not more than 3 miles one way.

Ne ideas if this is a sign of pending doom??
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Old 10-05-2010, 02:54 PM   #15
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Thanks,

What happens if the bubbles are not out completely?

Also the temp needle on my jeep is acting a little weird.
when i am on the highway getting to the highway speed, it goes to almost the 210 line but comes back down to about 200 (more like on 2), the difference is not much but this didnot happen before my radiator started leaking. the leak is quite slow but i keep checking the levels in the tank every morning and evening, and my commute is not more than 3 miles one way.

Ne ideas if this is a sign of pending doom??
A bit of heat build up before the effect of the thermostat opening up (flow from radiator) is felt by the gage, or a sticky thermostat, or a faulty gage. I think it is the first one and not a problem, but keep an eye on it.

I ran my Jeep's engine (while on a level surface) with the radiator cap off and monitored the flow, adding fluid as needed until warm/starting to overflow. Then shut it down, added some more coolant after it cooled down. Put the radiator cap on. Did a second check and top after running it again. That was about it. No problems with air not getting out.

I don't believe you have to worry about running the heater, there's no control valve on my heater lines. Continual flow was a change made to keep heater lines from plugging up due to non use, I believe. My Van is the same.

When using the radiator drain method, one will need to drain, fill, run, cool down, drain about 5 times to get over 90% of the old antifreeze out of the system. That's based on:
Drain once - 50% gone
Drain twice- 75% gone
Drain thrice - 87.5% gone
Drain four times - 94% gone
Drain five times - 97% gone
Then add pure antifreeze using the amount the engine should take minus say a cupful, then top up with distilled or demineralized water. Run and check what it tests at after you have got rid of any air.
Fill the reservoir with enough pure antifreeze (or no pure antifreeze) to get the reading you are anticipating, then add water to the reservoir to the mark. Check again after a week or so of driving.

When draining the radiator, leave the radiator cap on to drain the reservoir. This will be slow, so you might want to take the radiator cap off and drain the reservoir separately using say a $5.00 squeeze bulb pump. Alternately, remove the reservoir and flush it out real clean.
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Old 10-05-2010, 03:17 PM   #16
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This is really helpful.. thanks a lot TJeepman.
I had a coolant flush done bout 4-5000 miles back.
I think is could be able to reuse the coolant. or am i wrong?
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Old 10-05-2010, 03:30 PM   #17
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And don't let your first drain of near pure coolant just drain into the street/ground, or not only are you a Nature hater but also a potential pet killer..

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Old 10-05-2010, 03:34 PM   #18
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Oh absolutely not.
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Old 10-05-2010, 04:12 PM   #19
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Might just be me, but the 50/50 thing is nowhere close to being critical enough to measure it that dilligently... nothing wrong with being precise mind you, but it isn't at all necessary.

Drain it , hose it, fill it. half what goes in should be antifreeze, half should be water... If you dump a gallon of antifreeze in and then only 3 quarts of water will fit, it's not that big a deal Flushing isn't meant to get the old coolant out, (If you switch from "regular" antifreeze to the new "long life" ones, then you should try to get all of it out if possible) it's meant to rinse out the corrosion and sediment that builds up in there.

Iit just runs through a bunch of little channels and carries heat away, it's not that serious .

Having said all that... older antifreeze loses it's anticorrosives over time, and new is cheap enough that I wouldn't reuse it.
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Old 10-05-2010, 06:43 PM   #20
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Doesn't take too much extra antifreeze in your system before the strength can't be measured on the commonly available hydrometers (Prestone from Wal-Mart for example). It will be out of their range.
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Old 10-05-2010, 06:47 PM   #21
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This is really helpful.. thanks a lot TJeepman.
I had a coolant flush done bout 4-5000 miles back.
I think is could be able to reuse the coolant. or am i wrong?
For replacing your radiator, sure reuse the coolant drained out. Could filter it through some cheese cloth, filter paper, fine screen or something if there is dirt in it. Do you have green coolant in your system? If so, that likely has a 2 year life expectancy.

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