Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 08-08-2007, 09:46 AM
Registered User
 
Join Date: Jun 2007
Posts: 15
Question Citric Acid wash with a busted radiator?

Sorry for the dupe question, thought I would give this its own thread.

I've got a leaking radiator on a (somewhat) new to me 82 300SD. Found DexCool bottle in trunk and looks like dex in the system. So... I'd like to give it a good flush before putting in the new radiator and the proper coolant.

But the radiator leaks pretty bad, at least under pressure. Can I just run it up to temp with the cap off an dlet it dribble a bit and be OK, or am I asking for trouble? I could always just flush with water and drain it out and hope for the best, but I've read about the weird things dex can do, like putting a sludgy coating on the interior of the block. Besides, I'm sure I've got some rust after 25 years and that might be nice to clear out too.

Any consensus on my best move here? I need to get this thing back on the road ASAP.

Reply With Quote
  #2  
Old 08-08-2007, 10:28 AM
Craig
Guest
 
Posts: n/a
If it was mine I would want to flush it as well as possible before installing the new radiator. I would probably drain the radiator, block, and heater hoses then force some tap water through the system to get out as much as possible. If the radiator isn't too bad, I would probably refill with an acid flush an let it get up to temperature with the cap off, maybe drive it around a little with the cap on if it doesn't leak too much. I would then flush with clean water and replace the radiator, that should keep almost all of the old stuff out of the new radiator.
Reply With Quote
  #3  
Old 08-08-2007, 10:55 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,471
best way to get DEATHCOOL out of a system is with air/water mixed.
make up a fitting where you hook your air compressor into a line that has full flow water going in. works great! THEN do the detergent, water, citric acid flush rinse flush thing.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #4  
Old 08-08-2007, 11:02 AM
Registered User
 
Join Date: Jun 2007
Posts: 15
Thanks Craig, that's what I was hoping to hear. The leak dribbles pretty badly, but I think with the cap off it will hold long enough for a flush (and I can watch and top up if needed)

I didn't want to do the flush with the new radiator in place for fear of clogging it all up before it even got 1 mile on it. I guess I'll try running it with the cap open and just water first to see if it holds well enough.

Now all I have to worry about is the condition of my heater core. Things smell a bit funny when I run it.
Reply With Quote
  #5  
Old 08-08-2007, 11:03 AM
Registered User
 
Join Date: Jun 2007
Posts: 15
VSTech,

How many PSI on the air for that flush technique?
Reply With Quote
  #6  
Old 08-08-2007, 11:07 AM
vstech's Avatar
DD MOD, HVAC,MCP,Mac,GMAC
 
Join Date: Mar 2006
Location: Mount Holly, NC
Posts: 26,471
psi don't matter, just run it off the air gun. ya want bubbles in there, not pressure.
have the cap off the system, and have full flow of water before you dump in the air. AMAZING how much crud comes out this way!
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
Reply With Quote
  #7  
Old 08-08-2007, 11:07 AM
Craig
Guest
 
Posts: n/a
Quote:
Originally Posted by JumpinJehosipha View Post
Now all I have to worry about is the condition of my heater core. Things smell a bit funny when I run it.
If you use a hose to flush out the core (like I do), be careful not to use too much pressure. Hopefully you are just smelling antifreeze from under the hood, not from a leaky core.
Reply With Quote
  #8  
Old 08-08-2007, 11:27 AM
Registered User
 
Join Date: Nov 2004
Location: CT, USA
Posts: 472
if you know where the leak in the radiator is, you could seal it with JB weld then do the flush, then replace the radiator.
Reply With Quote
  #9  
Old 08-12-2007, 05:59 PM
Registered User
 
Join Date: Jun 2007
Posts: 15
Well, I got around to dumping some water into they cooling system just to mover the car around. No way is it going to hold for long enough to do a proper soak with the citric acid. it drains in a couple of minutes. My plan? I'm going to bypass the radiator and loop the hoses right back into themselves. seem OK? Do I need to have some sort of expansion tube/tank in there just for a runup to temp? I could put a T fitting in to hook it to the expansion tank easily enough.

Citric acid was hard to locate locally, made a bunch of calls with no luck. ordered online, so it should be here in a few days. Always something...

Anyway, let me know if I'm insane to just try bypassing the radiator for the flush.

Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 06:35 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2022, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page