My coolant overflow tank keeps peeing

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Jul 30, 2017 | 06:05 PM

#11

OffroadFrance

Baja

Joined: Aug 2013

Posts: 5,845

Likes: 368

From: Near Bordeaux, France

It seems like the rad cap is not working OK. Borrow a new or used one from a kind hearted dealer and try it and if the problem is solved then buy a new cap.

Aug 1, 2017 | 08:16 PM

#12

Casey McManus

Thread Starter

4wd Low

Joined: Nov 2016

Posts: 10

Likes: 2

So the new cap seems to have done the trick (knocks on wood). I drove it to O'Reilly and had the same gurgling and hissing, got a new cap, put it on and drove home, no gurgling, no hissing. I've been driving the last few days in 100+ degree heat and it's been running well. AC is blowing cold and no waterfall noise. I topped the coolant off in the tank while cold, and it seems to return to the same amount after cooling back down from a drive. So barring any internal exhaust gas leaking into the system, it all seems to be doing well.

Thanks for all your help!

I'll update if something else essplodes.

Mar 19, 2020 | 03:23 PM

#13

Vai2kdna77

Three Wheeling

Joined: Apr 2013

Posts: 58

Likes: 1

From: Spring Hill, TN

Hi Casey- I have a 2001 disco 2 and wanted to know what size hose you used for the expansion overflow from radiator? My plastic garbage has cracked (installing battery) and now I am pissed beyond belief. Please let me know tube size and hose length! Looks good!

Quote:

Originally Posted by Casey McManus

So I just replaced the majority of my cooling system. Radiator, water pump, upper T hose, thermostat, expansion tank cap, the hose from the engine block to the expansion tank, and serpentine belt. I'm not having any more leaks, but I am having an issue with the rover peeing from the expansion tank after I turn the engine off from a drive. I'm hoping it's just as simple as a new expansion tank, but what else could be the underlying cause? Why am I getting that much pressure in the first place?

Here's a video of it doing the stuff.
https://www.youtube.com/watch?v=GuNo0qzLq4o

Also, background history: I had the head gaskets replaced a couple years ago by a L.R. specialist shop and it hasn't overheated since. I did these changes due to water pump bearings out and leaks. So I don't think that should be the issue.