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Mar 9, 2013 | 09:29 AM

#16

Fishy Xj

Junior Member

Joined: Feb 2013

Posts: 48

Likes: 0

From: Ohio

Year: 1998

Model: Cherokee

Engine: 4.0L

Quote:

Originally Posted by djb383

There's no question that CLR works (dissolves calcium, lime, rust on metal that's been exposed to water).......the problem with CLR in a automotive cooling system, if not 100% removed, is that it continues to work.......eat/dissolve whatever it's in contact with, mainly very thin metal components in a automotive cooling system. My guess the reason why the CLR website says don't use in autos, is that they can't guarantee 100% removal from a cooling system.

When it comes to cooling system components, most vehicles are the same.

If you back flush the heater core with something low pressure, like a garden hose, refill, run it for a 100 miles it so then rinse and repeat it'll be fine. And I didn't mean every cars cooling systems are different, every car wears certain parts at different rates. So the odds of it messing up are greater. But it's a last resort before tearing your dash out. IMO.

Mar 9, 2013 | 10:34 AM

#17

tjwalker

CF Veteran

Joined: Nov 2010

Posts: 5,840

Likes: 117

From: In the middle of Minnesota!

Year: 1999

Model: Cherokee

Engine: 4.0

[QUOTE=Fishy Xj;2355977 But it's a last resort before tearing your dash out. IMO.[/QUOTE]

This is how I also feel about CLR. I have used it as a last resort, as tearing the heater core out of an XJ isn't something I enjoy doing.

I have had mixed luck with the CLR technique but keep the technique on the table as an option to try. For heater cores only.

Last edited by tjwalker; Mar 10, 2013 at 07:11 PM.