Brown coolant
#31
Junior Member
Thread Starter
Join Date: Mar 2014
Location: Anchorage Alaska
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Thanks everyone I'll take it in and have it tested before I do the flush. I did crawl underneath but idk where it's leaking from. It's enough of a leave for drops to from but it appears to be running from somewhere. When I take it to have it tested I think I'll see if they can tell me where it's leaking too. I looked into the over flow reservoir and there is a good amount of something on the bottom. It could be that sticky mud stuff, it's about the same color but thick.
#33
CF Veteran
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 18 Likes
on
18 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
Neat! I never heard of that. I suppose a guy could shim open the one way valve in the cap and run a tube from the overflow nipple into a bit of that fluid and let it bubble, also.
#34
Junior Member
Thread Starter
Join Date: Mar 2014
Location: Anchorage Alaska
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
You can test it yourself, its easy, Autozone will loan you the tool Video Link: https://www.youtube.com/watch?v=CHp5E7XnbXo
#36
Junior Member
Thread Starter
Join Date: Mar 2014
Location: Anchorage Alaska
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Ok I did that test. The liquid is still blue. What now? I guess it's not a combustion leak but I still can't seem to find a visible leak and now what could explain the muddy gunk?
#37
Senior Member
Join Date: Nov 2013
Location: Lapeer, Murder Mitten
Posts: 773
Likes: 0
Received 1 Like
on
1 Post
Year: 2000
Model: Cherokee
Engine: 4.0 I6
Well that rules out combustion gases in coolant. Suggest pressure testing system. If good flush and/or clean system. I've "heard" coolant can become acidic over time, combine that with cast iron, maybe a little air, you have rust.
#38
Junior Member
Thread Starter
Join Date: Mar 2014
Location: Anchorage Alaska
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
I'm going to run the test one more time before I return it, just in case, but I guess next I'll do the pressure test.
#41
CF Veteran
Join Date: Jan 2015
Location: Southern Maryland
Posts: 1,381
Likes: 0
Received 1 Like
on
1 Post
Year: 1991
Model: Cherokee
Engine: 1999 4.0L
Time for vinegar flush, 1 qt vinegar the rest water, bring to operating temp, then cooldown and drain. Couple of flushes with tap water after that. When you're ready for the final fill you should buy a couple of gallons of distilled water and add that to the antifreeze, it won't react as harshly
#42
Member
You can flush it with wisk. Yes you heard that right Wisk the laundry detergent. My grandfather taught me that trick long ago and oddly enough it always seems to get whatever gunk you got going on in the cooling system out.
#43
Junior Member
Thread Starter
Join Date: Mar 2014
Location: Anchorage Alaska
Posts: 67
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
Cool I think I'm going to flush it tomorrow. So last time I flushed it i Cut a T in the hose going to my heater cord and inserted the little thing that the whole screws into so I have it already in there I ran the heater and I ran the jeep on and I continuously let the water drain from the radiator and just come running it like that with the constant stream running through I did that until the stream was clear and then I let it run a little longer. Should I put the whisk where the vinegar whatever use it in and then close the drain plug and let it run for a while like that or is it something that I let continuously run through the system and continuously drain with the hose in?
#44
Member
Cool I think I'm going to flush it tomorrow. So last time I flushed it i Cut a T in the hose going to my heater cord and inserted the little thing that the whole screws into so I have it already in there I ran the heater and I ran the jeep on and I continuously let the water drain from the radiator and just come running it like that with the constant stream running through I did that until the stream was clear and then I let it run a little longer. Should I put the whisk where the vinegar whatever use it in and then close the drain plug and let it run for a while like that or is it something that I let continuously run through the system and continuously drain with the hose in?