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Unread 06-12-2013, 05:43 AM   #1
rocky_lange
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2001 WJ 
 
Join Date: Feb 2012
Location: Pelham, AL
Posts: 77
Need to flush my 4.0

What brand of flush works best? Are there certain types or chemicals I need to avoid due to aluminum parts?

I am starting to see temps rising as of late and my girlfriend had it yesterday and overheated it blowing the crappy plastic radiator side tank. I'm going to replace the thermostat and probably give Griffin Rad a call.

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Unread 06-12-2013, 10:01 AM   #2
Jrboarder27
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2000 WJ 
 
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I used amsoil engine flush on my 4.7, but its hard to get. I've got a Napa in town that sells amsoil products, but I still had to pay a lot for the shipping because they would only buy it in bulk
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Unread 06-12-2013, 11:18 AM   #3
pinky2252s
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Why doou think you need to flush the system? Just because it over heated doesn't mean there is a blockage. It was most likely a bad thermostat or something. I would replace the thermostat with the radiator and drain and refill all the coolant. It should be fine just doing that.
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Unread 06-12-2013, 06:17 PM   #4
rocky_lange
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Quote:
Originally Posted by pinky2252s View Post
Why doou think you need to flush the system? Just because it over heated doesn't mean there is a blockage. It was most likely a bad thermostat or something. I would replace the thermostat with the radiator and drain and refill all the coolant. It should be fine just doing that.
Because some idiot ran non HOAT coolant in it. It runs fine for a while, comes up to temp and levels off for a while, then it creaps up. If going slow or stopped it spikes.
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Unread 06-12-2013, 06:19 PM   #5
pinky2252s
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Quote:
Originally Posted by rocky_lange View Post
Because some idiot ran non HOAT coolant in it. It runs fine for a while, comes up to temp and levels off for a while, then it creaps up. If going slow or stopped it spikes.
I would just "flush" it with water. Do a few drain and refills with just water until no coolant comes out any more. Used distilled water bought from the store.
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Unread 06-12-2013, 06:46 PM   #6
Jrboarder27
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See, I wish I new you were talking about your cooling system
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Unread 06-12-2013, 07:03 PM   #7
99WJ539918
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Quote:
Originally Posted by pinky2252s View Post
I would just "flush" it with water. Do a few drain and refills with just water until no coolant comes out any more. Used distilled water bought from the store.
Exactly, use distilled water. Mixing coolant types is bad. Replace your radiator and thermostat and might as well do the hoses, too. Fill, run, and drain it three to five times. Good luck.
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Unread 06-12-2013, 08:06 PM   #8
robby65
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I would do water pump too.
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