2.5 n/a D temperature fluctuation

9

90ninety

Guest

• Apr 7, 2005

• #1

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.

 

T

Tom Woods

Guest

• Apr 7, 2005

• #2

On Thu, 7 Apr 2005 20:18:16 +0100, "90ninety"
<[email protected]> 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.
>

 

G

George Spigot

Guest

• Apr 7, 2005

• #3

"90ninety" <[email protected]> wrote in message
news:[email protected]...
> 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?

 

P

PDannyD

Guest

• Apr 8, 2005

• #4

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.

 

9

90ninety

Guest

• Apr 8, 2005

• #5

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" <[email protected]> wrote in message
news:[email protected]...
> 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.
>

 

G

Gmacz

Guest

• Apr 8, 2005

• #6

"90ninety" <[email protected]> wrote in message
news:[email protected]...
> 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

 

9

90ninety

Guest

• Apr 11, 2005

• #7

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

Cheers, Stew.

"90ninety" <[email protected]> wrote in message
news:[email protected]...
> 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.
>