How to flush coolant from engine block with radiator off? - JeepForum.com
Reply
 
LinkBack Thread Tools
post #1 of 18 Old 05-03-2017, 10:43 AM Thread Starter
steve_80
Registered User
2000 WJ 
 
Join Date: Apr 2010
Location: Langley
Posts: 1,130
Garage
How to flush coolant from engine block with radiator off?

I'm changing my radiator as it was leaking and was thinking of flushing the engine block.

How do I do this without the radiator installed? I've read that normally I would run the engine with water in the coolant until it runs clear, then add concentrated coolant.

But how would I flush the block without being able to turn the engine on?

I want do this before installing the new radiator so it doesn't get crap in it.

Do I just stick a garden hose in the top radiator hose (on the engine) and it will flow out the bottom radiator hose?


Thanks!

steve_80 is offline  
Sponsored Links
Advertisement
 
post #2 of 18 Old 05-03-2017, 10:53 AM
ChrisHager
Administrator
 
ChrisHager's Avatar
2004 WJ 
 
Join Date: Jan 2011
Location: Springfield
Posts: 10,419
Garage
You could dump distilled water into the top hose and let gravity do the rest.

If you're feeling a bit Tim Taylor-ish, you could buy a drill power pump and adapt it to the coolant hoses. The idea would be to suck clean water out of a bucket, pressurize it through the block, then catch the gunk on the other end.

Which would I choose? The latter, just because it's much more interesting.

Plus, I already did this with my heater core on the J10. From that build thread:

Quote:
Originally Posted by ChrisHager View Post
I took your advice, Mr. Forward, and picked up a drill pump from Harbor Freight to assist in my heater core cleaning. As usual, I took pictures!

Heavy Duty Drill Powered Pump





I hooked a heater core hose to one side of the pump and submerged the other heater core hose in a bucket of clean water and started pumping. Note that with this pump, you have to get it cranking before it will self prime. Once primed, it works awesome!



After cycling both directions a few times...



Once I rinsed it, I ran the pump with the hose out of the water in an attempt to empty the core. Then I added some Preston Radiator Flush + Cleaner by dumping it down one of the heater core hoses. I let it sit for 20-30 minutes.



While this was sitting, I poked my head inside and saw this:



Even though I was jealous that I wasn't warm in front of the fire, I decided I needed to go out and get back to work. With the Prestone cleaner still in the heater core, I hooked the hoses up to cycle only the cleaner. I ran it both directions a few times and let it sit.



Lastly, I ran more clean water through both directions to rinse it out. I also attempted to remove most of the fluid from the heater core. In an attempt to not have an air lock in the core, I poured coolant down the hoses before I hooked them back up. Overall, I'm pleased with the outcome. With the temperatures only reaching a high of -2°F and a low of -13°F yesterday, I was pleased to notice an increase in temperature in the cab. I'm still not positive if everything is working as it should but I need to take it for a real drive before I make my final decision on the situation.

~Chris
His: 2004 WJ - OME HD 'Kolak' Lift -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

His: 1979 J-10 - 3" on 33s -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

His: 2009 Expedition
His: 1978 F250 Custom -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Hers: 2000 TJ
Hers: 2010 Jetta


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Quote:
Originally Posted by Matt
"You can't recycle tartar sauce."
Quote:
Originally Posted by steve_80 View Post
Weird, I didn't realize you could use vomit as coolant.
ChrisHager is offline  
post #3 of 18 Old 05-03-2017, 11:05 AM Thread Starter
steve_80
Registered User
2000 WJ 
 
Join Date: Apr 2010
Location: Langley
Posts: 1,130
Garage
Weird, I didn't realize you could use vomit as coolant.

Funny gadget.. never heard of it. Found this one http://www.canadiantire.ca/en/pdp/ma...-0543802p.html

So for me, what hose should I connect it to? It's too small for the upper/lower rad hose.
steve_80 is offline  
 
post #4 of 18 Old 05-03-2017, 11:21 AM
ChrisHager
Administrator
 
ChrisHager's Avatar
2004 WJ 
 
Join Date: Jan 2011
Location: Springfield
Posts: 10,419
Garage
Quote:
Originally Posted by steve_80 View Post
Weird, I didn't realize you could use vomit as coolant.


I think that's sig worthy.

Quote:
Originally Posted by steve_80 View Post
So for me, what hose should I connect it to? It's too small for the upper/lower rad hose.
I've been pondering that. You're going to need to neck down from the large coolant hose to a small one. So far, I'm not coming up with much. My Tim Taylor idea has some holes in it...

I want to note two things:

1. Your heater core will have old coolant in it as well. It will need flushed.
B. If you use this tool to rinse your heater core, be very careful. This thing can make a lot of pressure - enough to rupture the core.

~Chris
His: 2004 WJ - OME HD 'Kolak' Lift -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

His: 1979 J-10 - 3" on 33s -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

His: 2009 Expedition
His: 1978 F250 Custom -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Hers: 2000 TJ
Hers: 2010 Jetta


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Quote:
Originally Posted by Matt
"You can't recycle tartar sauce."
Quote:
Originally Posted by steve_80 View Post
Weird, I didn't realize you could use vomit as coolant.
ChrisHager is offline  
post #5 of 18 Old 05-03-2017, 11:23 AM
azzkicker
Registered User
2007 WK 
 
Join Date: Dec 2016
Location: Beaverton
Posts: 1,042
The heater hose is probably the right size. I've installed those flushing ports before, where you cut your heater hose and permanently install this thing that gives you a garden hose connection with a cap. Make sure you don't pressurize your system with the cap installed. You can split a heater core and ruin your whole day.

Make sure you run the garden hose a while first. Sometimes slugs come out of my hoses and you wouldn't want one of those in your engine. You should end up with distilled water and coolant, but flushing with hose water makes sense to me, then I drain all I can, refill with distilled water, run the engine, drain the radiator again and top up with coolant. It will be pretty clean.

I'm scared to use any flushing chemicals, and it seems like water works just fine. I don't know what's in the chemicals, or what seals in the engine would hate them. I guess if jeep made a flushing chemical, I'd trust it.

I just flushed mine by running the engine with a hose trickling water in and the radiator drain open. It looked like rusty mud for about 20 minutes, then cleared up. Then I filled it up with distilled water and drove to run errands. When I got back, the water in the radiator looked a little rusty, so I did the whole process again. It looked great the second time, so I drained the radiator and topped up with mopar coolant (hemi) and distilled water. I ended up using about 6 gallons of distilled water and one gallon of mopar juice. I'm going to run it until I'm sure I don't have a cooling problem, then I'll drain only a gallon out so I can put one more gallon of mopar juice in. No other additives. Most of those things are snake oil or damage your stuff, in my opinion.

07 WK 5.7 QD2, 4" lift, 33X10" tires, two M8000s
ARB twin air,Dual AGM group 49, sliders and skids
azzkicker is offline  
post #6 of 18 Old 05-03-2017, 02:28 PM
sdg3205
Registered User
 
sdg3205's Avatar
2001 WJ 
 
Join Date: Jun 2011
Location: Surrey
Posts: 1,533
Do you have a shop vac? I used mine to suck from the thermostat housing. Pour distilled water in from the top.

I've also used Preston Rad flush but you need a sealed system.
sdg3205 is offline  
post #7 of 18 Old 05-03-2017, 02:35 PM Thread Starter
steve_80
Registered User
2000 WJ 
 
Join Date: Apr 2010
Location: Langley
Posts: 1,130
Garage
i do, hm never thought of using that. Can I mix the rad flush into distilled water, then pour that into the top then suck it through (partially), let it sit, then empty out?
steve_80 is offline  
post #8 of 18 Old 05-03-2017, 04:01 PM
sdg3205
Registered User
 
sdg3205's Avatar
2001 WJ 
 
Join Date: Jun 2011
Location: Surrey
Posts: 1,533
Quote:
Originally Posted by steve_80 View Post
i do, hm never thought of using that. Can I mix the rad flush into distilled water, then pour that into the top then suck it through (partially), let it sit, then empty out?
That might have some effect, but its suppose to cycle with the engine running for a given length of time. I think heat might be important.

If i were you I'd suck out as much old coolant with the shop vac as possible, then rebuild your system. Getting it running with just distilled water and rad flush, then flush it with just distilled water, drain and keep flushing until its crystal clear, then add Zerex concentrate for your 50/50 mixture.
sdg3205 is offline  
post #9 of 18 Old 05-03-2017, 04:18 PM
blueseasons1
Registered User
2000 WJ 
 
Join Date: Jun 2016
Posts: 487
Can't you just take out the thermostat and run a garden hose through the top of the engine and let it drain/flush out the bottom of it
blueseasons1 is offline  
post #10 of 18 Old 05-03-2017, 05:17 PM
sdg3205
Registered User
 
sdg3205's Avatar
2001 WJ 
 
Join Date: Jun 2011
Location: Surrey
Posts: 1,533
Ideally you use distilled water but yes you probably could!
sdg3205 is offline  
post #11 of 18 Old 05-04-2017, 07:12 AM
ChrisHager
Administrator
 
ChrisHager's Avatar
2004 WJ 
 
Join Date: Jan 2011
Location: Springfield
Posts: 10,419
Garage
I think I'd mix the above suggestions.

Step 1: Cut a hole in a box.
Step 2: Flush it with the garden hose.
Step 3: Suck out what you can with the shop vac.
Step 4: Assemble the system and fill with distilled water.
Step 5: Rinse. Repeat.
Step 6: Fill with Zerex concentrate.

~Chris
His: 2004 WJ - OME HD 'Kolak' Lift -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

His: 1979 J-10 - 3" on 33s -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

His: 2009 Expedition
His: 1978 F250 Custom -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Hers: 2000 TJ
Hers: 2010 Jetta


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Quote:
Originally Posted by Matt
"You can't recycle tartar sauce."
Quote:
Originally Posted by steve_80 View Post
Weird, I didn't realize you could use vomit as coolant.
ChrisHager is offline  
post #12 of 18 Old 05-04-2017, 09:32 AM Thread Starter
steve_80
Registered User
2000 WJ 
 
Join Date: Apr 2010
Location: Langley
Posts: 1,130
Garage
Quote:
Originally Posted by ChrisHager View Post

Step 1: Cut a hole in a box.
huh?

Does this method also flush the heater core? I might as well flush that while I'm at it.
steve_80 is offline  
post #13 of 18 Old 05-04-2017, 09:50 AM
ChrisHager
Administrator
 
ChrisHager's Avatar
2004 WJ 
 
Join Date: Jan 2011
Location: Springfield
Posts: 10,419
Garage


Nevermind Step 1. There's a hidden joke there.

You could do your heater core this way as well.

~Chris
His: 2004 WJ - OME HD 'Kolak' Lift -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

His: 1979 J-10 - 3" on 33s -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

His: 2009 Expedition
His: 1978 F250 Custom -
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Hers: 2000 TJ
Hers: 2010 Jetta


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Quote:
Originally Posted by Matt
"You can't recycle tartar sauce."
Quote:
Originally Posted by steve_80 View Post
Weird, I didn't realize you could use vomit as coolant.
ChrisHager is offline  
post #14 of 18 Old 05-04-2017, 10:14 AM
Planetcat
Registered User
2010 WK 
 
Join Date: Jan 2010
Location: West of the Mississippi
Posts: 2,000
Quote:
Originally Posted by blueseasons1 View Post
Can't you just take out the thermostat and run a garden hose through the top of the engine and let it drain/flush out the bottom of it
I've done this several times. It is sufficient. Or just run the hose through the upper rad hose and let it run out the bottom one.
Planetcat is offline  
post #15 of 18 Old 05-04-2017, 02:38 PM
Double E
Web Wheeler
 
Double E's Avatar
2004 WJ 
 
Join Date: Oct 2003
Location: Raleigh, NC
Posts: 5,912
lololoL
Step One: CUT A HOLE IN A BOX!
Love it.


Mother's day is near!

'04 Freedom Edition HO & '04 Overland HO (previous '00 Laredo 4.7)
Double E is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome