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Old 04-07-2005, 14:02   #1 (permalink)
90ninety
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2.5 n/a D temperature fluctuation

Hi folks,
When running at speed (60 - 70 MPH) for 10mins or so the temp gets very
near the red, but no further.
When I slow down to 40 - 50 MPH the temp wil still stay near the red for 5
or 6 minutes then it suddenly plunges to below half way!
Transition from near red to below halfway take a couple of seconds.
I have my own ides of possible causes - but don't wish to appear stupid
before those of greater knowledge!!!
This weekend I intend to give the rad, heater etc a good flush and new
distilled water/antifreeze.

Any other ideas chaps?

All help appreciated - Stew.


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Old 04-07-2005, 14:02   #2 (permalink)
Tom Woods
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Re: 2.5 n/a D temperature fluctuation

On Thu, 7 Apr 2005 20:18:16 +0100, "90ninety"
<spector_stew@yahoo.co.uk.no.spam.please> wrote:

>Hi folks,
> When running at speed (60 - 70 MPH) for 10mins or so the temp gets very
>near the red, but no further.
>When I slow down to 40 - 50 MPH the temp wil still stay near the red for 5
>or 6 minutes then it suddenly plunges to below half way!
>Transition from near red to below halfway take a couple of seconds.
>I have my own ides of possible causes - but don't wish to appear stupid
>before those of greater knowledge!!!
>This weekend I intend to give the rad, heater etc a good flush and new
>distilled water/antifreeze.
>
>Any other ideas chaps?


Sudden temperature changes in engines in my experience have always
been due to thermostats. maybe yours is opening late.
Try taking it out and go for a drive and see if it now runs cool. If
so then its not a serious problem causing it to get hot.
If you do replace the 'stat give it a flush and new coolant too, while
you are at it!

My 2.5 currently has a thermostat which is stuck open and the gauge
hardly registers anything until i go at 50 or 60 for 10 minutes or so.
>


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Old 04-07-2005, 15:01   #3 (permalink)
George Spigot
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Re: 2.5 n/a D temperature fluctuation


"90ninety" <spector_stew@yahoo.co.uk.no.spam.please> wrote in message
news:d3413p$g1t$1@news8.svr.pol.co.uk...
> Hi folks,
> When running at speed (60 - 70 MPH) for 10mins or so the temp gets very
> near the red, but no further.
> When I slow down to 40 - 50 MPH the temp wil still stay near the red for 5
> or 6 minutes then it suddenly plunges to below half way!
> Transition from near red to below halfway take a couple of seconds.
> I have my own ides of possible causes - but don't wish to appear stupid
> before those of greater knowledge!!!
> This weekend I intend to give the rad, heater etc a good flush and new
> distilled water/antifreeze.


have your radiator fins rotted away?


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Old 04-07-2005, 17:01   #4 (permalink)
PDannyD
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Re: 2.5 n/a D temperature fluctuation

90ninety wrote:

> Hi folks,
> When running at speed (60 - 70 MPH) for 10mins or so the temp gets very
> near the red, but no further.
> When I slow down to 40 - 50 MPH the temp wil still stay near the red for 5
> or 6 minutes then it suddenly plunges to below half way!
> Transition from near red to below halfway take a couple of seconds.


My first two ideas are either a sticking thermostat or a sticking gauge.
You might want to also check for air locks or low fluid level.

When it's hot, turn it off and see if the gauge falls smoothly back to the
cold position. If it does then the gauge is probably ok.
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Old 04-08-2005, 04:02   #5 (permalink)
MVP
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Re: 2.5 n/a D temperature fluctuation

On Thu, 7 Apr 2005 20:18:16 +0100, "90ninety"
<spector_stew@yahoo.co.uk.no.spam.please> wrote:

>Hi folks,
> When running at speed (60 - 70 MPH) for 10mins or so the temp gets very
>near the red, but no further.
>When I slow down to 40 - 50 MPH the temp wil still stay near the red for 5
>or 6 minutes then it suddenly plunges to below half way!
>Transition from near red to below halfway take a couple of seconds.
>I have my own ides of possible causes - but don't wish to appear stupid
>before those of greater knowledge!!!
>This weekend I intend to give the rad, heater etc a good flush and new
>distilled water/antifreeze.
>
>Any other ideas chaps?
>
>All help appreciated - Stew.
>


My 2.5 n/a runs around half on the guage all the time, slightly below
half on regular 50mph ish, if I'm gunning it (65-70 on motorways) the
guage will be slightly over half, ditto if I'm driving
enthusiastically off-road or on windy backroads.

I would expect you to be running hotter at 70mph because a 2.5 n/a is
working very hard there.

Faced with your symptoms I'd overhaul the cooling system, drain and
flush the block and radiator, new thermostat, nice new 50/50 coolant
mix (10.8 litres) and if that didn't solve the behaviour and the
radiator didn't look too rough (missing fins etc) then I'd look at the
sensor for the temp guage.

in my humble opinion, if following my advice kills your engine it's
not my fault, etc etc etc.


Regards.
Mark.
--
_________________________________________
1984 110 CSW 2.5(na)D
(3,000 rivets flying in close formation)
www.4x4info.info
www.mvp-fine-art.co.uk
www.markvarleyphoto.co.uk
charity calendar project -
http://www.4x4info.info/calendar/
_________________________________________



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Old 04-08-2005, 08:01   #6 (permalink)
90ninety
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Re: 2.5 n/a D temperature fluctuation

Thanks for the advice chaps.
It only started doing it this week. Temp gauge is okay. Fluid level is okay,
no fluid loss or airlocks.
Probably the thermostat then, which was my initial thought. Many thanks for
your help everyone. Very much appreciated and reassuring!

Stew.

--

1990 LR Ninety 2.5D N/A (Jasmine - the off-road toy!)
New Jeep Cherokee Sport CRD
Ex owner of 2002 Freelander Td4 ES (It was really, really bad)
Intersted in facts, not fiction? Look here - http://www.4x4prejudice.org


"90ninety" <spector_stew@yahoo.co.uk.no.spam.please> wrote in message
news:d3413p$g1t$1@news8.svr.pol.co.uk...
> Hi folks,
> When running at speed (60 - 70 MPH) for 10mins or so the temp gets very
> near the red, but no further.
> When I slow down to 40 - 50 MPH the temp wil still stay near the red for 5
> or 6 minutes then it suddenly plunges to below half way!
> Transition from near red to below halfway take a couple of seconds.
> I have my own ides of possible causes - but don't wish to appear stupid
> before those of greater knowledge!!!
> This weekend I intend to give the rad, heater etc a good flush and new
> distilled water/antifreeze.
>
> Any other ideas chaps?
>
> All help appreciated - Stew.
>



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Old 04-08-2005, 13:01   #7 (permalink)
Gmacz
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Posts: n/a
Re: 2.5 n/a D temperature fluctuation


"90ninety" <spector_stew@yahoo.co.uknospam> wrote in message
news:d360rk$t2b$1@newsg3.svr.pol.co.uk...
> Thanks for the advice chaps.
> It only started doing it this week. Temp gauge is okay. Fluid level is
> okay, no fluid loss or airlocks.
> Probably the thermostat then, which was my initial thought. Many thanks
> for your help everyone. Very much appreciated and reassuring!
>
> Stew.

I have the same problem and as mentioned previously my radiator fins have
rotted away to nothing.
It does not leak, but the temperature gets near red at speed. Slowing down,
the temp comes down.
Yours Gmacz


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Old 04-11-2005, 10:01   #8 (permalink)
90ninety
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Posts: n/a
Re: 2.5 n/a D temperature fluctuation

Found the fault chaps. Me bloomin water pump is knackered!!!
I pick up the replacement in the morning!!

Cheers, Stew.

"90ninety" <spector_stew@yahoo.co.uk.no.spam.please> wrote in message
news:d3413p$g1t$1@news8.svr.pol.co.uk...
> Hi folks,
> When running at speed (60 - 70 MPH) for 10mins or so the temp gets very
> near the red, but no further.
> When I slow down to 40 - 50 MPH the temp wil still stay near the red for 5
> or 6 minutes then it suddenly plunges to below half way!
> Transition from near red to below halfway take a couple of seconds.
> I have my own ides of possible causes - but don't wish to appear stupid
> before those of greater knowledge!!!
> This weekend I intend to give the rad, heater etc a good flush and new
> distilled water/antifreeze.
>
> Any other ideas chaps?
>
> All help appreciated - Stew.
>



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Old 04-11-2005, 11:01   #9 (permalink)
MVP
Guest
 
Posts: n/a
Re: 2.5 n/a D temperature fluctuation

On Mon, 11 Apr 2005 17:09:36 +0100, "90ninety"
<spector_stew@yahoo.co.uk.no.spam.please> wrote:

>Found the fault chaps. Me bloomin water pump is knackered!!!
>I pick up the replacement in the morning!!
>
>Cheers, Stew.


I changed my water pump when I had the timing belt done, the old one
was starting to get a little noisy, when I tool it out the fins were
about half the size of the ones on the replacement... :oO


Regards.
Mark.
--
_________________________________________
1984 110 CSW 2.5(na)D
(3,000 rivets flying in close formation)
www.4x4info.info
www.mvp-fine-art.co.uk
www.markvarleyphoto.co.uk
charity calendar project -
http://www.4x4info.info/calendar/
_________________________________________



.................................................................
Posted via TITANnews - Uncensored Newsgroups Access
>>>> at http://www.TitanNews.com <<<<

-=Every Newsgroup - Anonymous, UNCENSORED, BROADBAND Downloads=-

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