[xj] Coolant Boiling

Hello all,

I have always had a problem with the coolant in my S3 boiling over. After
a long run, or on a hot day, when I turn the ignition off you can easily
here the coolant in the header tank, (the brown plastic tank), boiling, and
sometimes you can even see the coolant coming out the overflow pipe.
I’m using a castrol coolant recommended by all the Jag mechanics around
me, and I’m using it without any problems in the other Jag’s. Now I’m
starting to just use distilled water, as I can’t afford the $20 a bottle
it’s costing just to lose 5Litres or so a week…
My thermo fan is working correctly, and I have flushed the radiator with a
compressor and hose. (while I had the engine out). It appeared to be ok.
Does anyone have any ideas as to what it might be causing the coolant to
get so hot?

Thank you in advance.
Russell.
'72 XJ6
'84 Sovereign
'67 E Type Roadster
'58 XK 150 FHC_________________________________________________________
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could be a faulty radiator cap not holding pressure and allowing the coolant
to boil…-----Original Message-----
From: Russell Mecklenburgh [mailto:rmecklenburgh@yahoo.com]
Sent: Wednesday, 13 February, 2002 12:13 p.m.
To: XJ list (E-mail)
Subject: [xj] Coolant Boiling

Hello all,

I have always had a problem with the coolant in my S3 boiling over. After
a long run, or on a hot day, when I turn the ignition off you can easily
here the coolant in the header tank, (the brown plastic tank), boiling, and
sometimes you can even see the coolant coming out the overflow pipe.
I’m using a castrol coolant recommended by all the Jag mechanics around
me, and I’m using it without any problems in the other Jag’s. Now I’m
starting to just use distilled water, as I can’t afford the $20 a bottle
it’s costing just to lose 5Litres or so a week…
My thermo fan is working correctly, and I have flushed the radiator with a
compressor and hose. (while I had the engine out). It appeared to be ok.
Does anyone have any ideas as to what it might be causing the coolant to
get so hot?

Thank you in advance.
Russell.
'72 XJ6
'84 Sovereign
'67 E Type Roadster
'58 XK 150 FHC


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Get your free @yahoo.com address at http://mail.yahoo.com

===================================================
The archives and FAQ will answer many queries on the XJ series…
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Russell: is your coolant cap correctly functioning, and is it a 15lb cap?
That can make a difference.
Gregory----- Original Message -----
From: “Russell Mecklenburgh” rmecklenburgh@yahoo.com
To: “XJ list (E-mail)” xj@jag-lovers.org
Sent: Tuesday, February 12, 2002 3:13 PM
Subject: [xj] Coolant Boiling

: Hello all,
:
: I have always had a problem with the coolant in my S3 boiling over. After
: a long run, or on a hot day, when I turn the ignition off you can easily
: here the coolant in the header tank, (the brown plastic tank), boiling,
and
: sometimes you can even see the coolant coming out the overflow pipe.
: I’m using a castrol coolant recommended by all the Jag mechanics around
: me, and I’m using it without any problems in the other Jag’s. Now I’m
: starting to just use distilled water, as I can’t afford the $20 a bottle
: it’s costing just to lose 5Litres or so a week…
: My thermo fan is working correctly, and I have flushed the radiator with
a
: compressor and hose. (while I had the engine out). It appeared to be ok.
: Does anyone have any ideas as to what it might be causing the coolant to
: get so hot?
:
: Thank you in advance.
: Russell.
: '72 XJ6
: '84 Sovereign
: '67 E Type Roadster
: '58 XK 150 FHC
:
: _________________________________________________________
: Do You Yahoo!?
: Get your free @yahoo.com address at http://mail.yahoo.com
:
:
: ===================================================
: The archives and FAQ will answer many queries on the XJ series…
: FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
: Archives: http://www.jag-lovers.org/lists/search.html
:
: To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo.
:

===================================================
The archives and FAQ will answer many queries on the XJ series…
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Hi Russel,
I suggest that you change the cap on the tank-even if it looks good.
Regards, Michael 85 xj6 VDP----- Original Message -----
From: “Russell Mecklenburgh” rmecklenburgh@yahoo.com
To: “XJ list (E-mail)” xj@jag-lovers.org
Sent: Tuesday, February 12, 2002 6:13 PM
Subject: [xj] Coolant Boiling

Hello all,

I have always had a problem with the coolant in my S3 boiling over. After
a long run, or on a hot day, when I turn the ignition off you can easily
here the coolant in the header tank, (the brown plastic tank), boiling,
and
sometimes you can even see the coolant coming out the overflow pipe.
I’m using a castrol coolant recommended by all the Jag mechanics around
me, and I’m using it without any problems in the other Jag’s. Now I’m
starting to just use distilled water, as I can’t afford the $20 a bottle
it’s costing just to lose 5Litres or so a week…
My thermo fan is working correctly, and I have flushed the radiator with
a
compressor and hose. (while I had the engine out). It appeared to be ok.
Does anyone have any ideas as to what it might be causing the coolant to
get so hot?

Thank you in advance.
Russell.
'72 XJ6
'84 Sovereign
'67 E Type Roadster
'58 XK 150 FHC


Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo.

===================================================
The archives and FAQ will answer many queries on the XJ series…
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Hi all,
getting a bit worried about the rad. caps. I bought two a couple of months
ago. they looked really strong with the valve-spring, but I’m sure they were
13lbs ones (xj6, s1 of 72). the car also boils over, so is that a problem of
cap pressure (2lbs). If really so maybe that’ll keep all the coolant inside
and save me some trouble.
cheers guys,
Guillaume-----Original Message-----
From: owner-xj@jag-lovers.org [mailto:owner-xj@jag-lovers.org]On Behalf
Of Dr Gregory Andrachuk
Sent: Wednesday, February 13, 2002 3:39 AM
To: rmecklenburgh@yahoo.com
Cc: jag-lovers
Subject: Re: [xj] Coolant Boiling

Russell: is your coolant cap correctly functioning, and is it a 15lb cap?
That can make a difference.
Gregory
----- Original Message -----
From: “Russell Mecklenburgh” rmecklenburgh@yahoo.com
To: “XJ list (E-mail)” xj@jag-lovers.org
Sent: Tuesday, February 12, 2002 3:13 PM
Subject: [xj] Coolant Boiling

: Hello all,
:
: I have always had a problem with the coolant in my S3 boiling over. After
: a long run, or on a hot day, when I turn the ignition off you can easily
: here the coolant in the header tank, (the brown plastic tank), boiling,
and
: sometimes you can even see the coolant coming out the overflow pipe.
: I’m using a castrol coolant recommended by all the Jag mechanics around
: me, and I’m using it without any problems in the other Jag’s. Now I’m
: starting to just use distilled water, as I can’t afford the $20 a bottle
: it’s costing just to lose 5Litres or so a week…
: My thermo fan is working correctly, and I have flushed the radiator with
a
: compressor and hose. (while I had the engine out). It appeared to be ok.
: Does anyone have any ideas as to what it might be causing the coolant to
: get so hot?
:
: Thank you in advance.
: Russell.
: '72 XJ6
: '84 Sovereign
: '67 E Type Roadster
: '58 XK 150 FHC
:
: _________________________________________________________
: Do You Yahoo!?
: Get your free @yahoo.com address at http://mail.yahoo.com
:
:
: ===================================================
: The archives and FAQ will answer many queries on the XJ series…
: FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
: Archives: http://www.jag-lovers.org/lists/search.html
:
: To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo.
:

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo.

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FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
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If your cap is OK you May have a very small leak in the cooling system
somewhere. just enough to relieve the pressure and allow the coolant to
boil. Of course this could be a tricky one to find, could be anywhere that
the water goes.

Of course you will want to check around where the rad cap seals and make
sure there is no damage to the sealing face - and that the water has no
‘gunk’ in it that may get stuck under the cap sealing rubber and cause a
leak when the cap is trying to seal.

The only reason i say all this is that it sounds like you have tried new
cap’s and have had the problem for some time. This is all assuming that the
running temp at shut off is OK of course.

my SII had the same problem and it was the cap. once replaced - the problem
went away.

Good luck
cheers
Gavin-----Original Message-----
From: Guillaume Patricot [mailto:patricot@iafrica.com]
Sent: Wednesday, 13 February, 2002 11:18 p.m.
To: jag-lovers
Subject: RE: [xj] Coolant Boiling

Hi all,
getting a bit worried about the rad. caps. I bought two a couple of months
ago. they looked really strong with the valve-spring, but I’m sure they were
13lbs ones (xj6, s1 of 72). the car also boils over, so is that a problem of
cap pressure (2lbs). If really so maybe that’ll keep all the coolant inside
and save me some trouble.
cheers guys,
Guillaume

-----Original Message-----
From: owner-xj@jag-lovers.org [mailto:owner-xj@jag-lovers.org]On Behalf
Of Dr Gregory Andrachuk
Sent: Wednesday, February 13, 2002 3:39 AM
To: rmecklenburgh@yahoo.com
Cc: jag-lovers
Subject: Re: [xj] Coolant Boiling

Russell: is your coolant cap correctly functioning, and is it a 15lb cap?
That can make a difference.
Gregory
----- Original Message -----
From: “Russell Mecklenburgh” rmecklenburgh@yahoo.com
To: “XJ list (E-mail)” xj@jag-lovers.org
Sent: Tuesday, February 12, 2002 3:13 PM
Subject: [xj] Coolant Boiling

: Hello all,
:
: I have always had a problem with the coolant in my S3 boiling over. After
: a long run, or on a hot day, when I turn the ignition off you can easily
: here the coolant in the header tank, (the brown plastic tank), boiling,
and
: sometimes you can even see the coolant coming out the overflow pipe.
: I’m using a castrol coolant recommended by all the Jag mechanics around
: me, and I’m using it without any problems in the other Jag’s. Now I’m
: starting to just use distilled water, as I can’t afford the $20 a bottle
: it’s costing just to lose 5Litres or so a week…
: My thermo fan is working correctly, and I have flushed the radiator with
a
: compressor and hose. (while I had the engine out). It appeared to be ok.
: Does anyone have any ideas as to what it might be causing the coolant to
: get so hot?
:
: Thank you in advance.
: Russell.
: '72 XJ6
: '84 Sovereign
: '67 E Type Roadster
: '58 XK 150 FHC
:
: _________________________________________________________
: Do You Yahoo!?
: Get your free @yahoo.com address at http://mail.yahoo.com
:
:
: ===================================================
: The archives and FAQ will answer many queries on the XJ series…
: FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
: Archives: http://www.jag-lovers.org/lists/search.html
:
: To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo.
:

===================================================
The archives and FAQ will answer many queries on the XJ series…
FAQs: http://www.jag-lovers.org/xjlovers/xjfaq/index.html
Archives: http://www.jag-lovers.org/lists/search.html

To remove yourself from this list, go to
http://www.jag-lovers.org/cgi-bin/majordomo.

===================================================
The archives and FAQ will answer many queries on the XJ series…
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Archives: http://www.jag-lovers.org/lists/search.html

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Archives: http://www.jag-lovers.org/lists/search.html

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