Coolant line filling with air

T

trailsend

Member
Apr 2, 2013
5
0
United States
I replaced the thermostat in my 99 Disco II, and after replacing it one of the coolant hoses (coming from the bottom of the block back up to the thermostat) is expanding like a balloon. The longer the engine runs, the bigger it gets. Opening the top vent screw releases the air/gas, but it just gets more in there after I close it up again.

Looking for ideas on what could be the problem. It did not have this issue before I changed the thermostat, but it was overheating with the old thermostat (I changed it to try and fix that issue thinking it was stuck).



Any help is appreciated.

Thanks,

Derek
 
D

discostew

Well-known member
Sep 14, 2010
7,733
1,024
Northern Illinois
Are you sure you didn't switch the two big hoses on the top of the stat? I have never seen that happen, but that"s the first thing I would check. If not then take the stat back off and look for any problems in the casting.
 
chris1d2se7

chris1d2se7

Well-known member
Oct 5, 2009
53
1
mi
Check for exhaust gases in the coolant. If it was overheating before it could be a slipped sleeve. Sorry to assume the worst, but you may want to start there before throwing in a new radiator.
 
D

discostew

Well-known member
Sep 14, 2010
7,733
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chris1d2se7 said:
Check for exhaust gases in the coolant. If it was overheating before it could be a slipped sleeve. Sorry to assume the worst, but you may want to start there before throwing in a new radiator.
Click to expand...

Its not a slipped sleeve that causes the problem your talking about. It's cracks in the block behind the sleeve.
 
T

trailsend

Member
Apr 2, 2013
5
0
United States
listerdiesel said:
Thermostat fitted wrongly as above, my son did exactly the same thing on his V8.

Peter
Click to expand...

I was thinking this may be the case, but thought I had it right. Here is another pic from a different angle, the hose that is inflating is going into the "Y" portion coming out at an angle from the thermostat:



Does that look right?
Thanks for the help/suggestions!

Derek
 
N

number9

Well-known member
Nov 21, 2015
196
0
Coastal Georgia
Derek,

Looks correct to me.

Have you had a chance to bleed coolant system yet?

If not air in system or BFS thermostat consider the possibility that your hose is simply failing.

Good luck.

Bill

......
 
T

trailsend

Member
Apr 2, 2013
5
0
United States
I thought that I had bled it properly when I put the thermostat in, but I am going to try it again. Also going to try a different thermostat.

Thanks!

Derek
 
D

discostew

Well-known member
Sep 14, 2010
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Northern Illinois
number9 said:
Peter,

Appears correct routing to me.

Glasses may help when viewing photos you old fart or mine may just be installed wrongly too?

Best regards,
Old Fart Junior
Click to expand...

You can tell from that crappy picture that the two large hoses at the top of the stat are in the right positions? I can't tell shit from that pic. If it didn't do that before it's either those switched or the stats not bypassing.
 
Ed Cheung

Ed Cheung

Well-known member
Aug 23, 2006
1,584
2
Hong Kong
Looks wrong to me, according to the picture from RoverNorth, the ending coming straight up should goes to the water pump and one coming up at an angle goes to the upper hose.
 
D

discostew

Well-known member
Sep 14, 2010
7,733
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Northern Illinois
It kind of looks like he's got the t stat twisted to make it meet the wrong hoses. It would be sooo easy to just switch them and see if it stops doing that. Could have switched them about 5 times by now.
 
N

number9

Well-known member
Nov 21, 2015
196
0
Coastal Georgia
2 More Cents

Derek,

My '04 is routed exactly as yours is and I have no ballooning hose or overheating issues after doing my recent drain, flush and refill. Unfortunately LR didn't do a very good illustration job when they published the Workshop Manual and Illustrate Parts.

Sort of good news, just found another photo of one installed trying a bing search rather than google.

http://www.landroversonly.com/forum...ix-roadside-overheat-bad-thermostat-zz015.jpg

......
 
D

discostew

Well-known member
Sep 14, 2010
7,733
1,024
Northern Illinois
Re: 2 More Cents

number9 said:
Derek,

Unfortunately LR didn't do a very good illustration job when they published the Workshop Manual and Illustrate Parts.


......
Click to expand...

Land Rover likes cartoon drawings that are like a comic book. Pictures of trash cans to signify that you discard something. A picture of an eye to say inspect. But it's so a guy in Russia looks at the same comic book and they don't have to put out a service procedure in 100 languages. Shitty but that way for a reason.
 
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