Replacing Thermostat on '99 Disco 2_PLz read in.

I have had some overheating problems lately on my '99 Disco2, and
prior was having sporadic interior heat fluctuations. Sometimes I
couldn't get any heat at any settings.
Lately the temp guage will soar to red after 5 to 10 minutes of
running so I believe it must be a stuck thermostat....yes?

A bit of research has discovered that the thermostat seems
in-line....or in-hose to be more presise. Just curious if I need to
remove the (vicous fan?) as states in my manual or can I remove
without messing with it.

Anything I should be forwarned about? Appreciate any input.


Robert

"shamalama@dingdong" <[email protected]> wrote in message
news:[email protected]...
>
>
> I have had some overheating problems lately on my '99 Disco2,

Diesel or petrol?

> and
> prior was having sporadic interior heat fluctuations. Sometimes I
> couldn't get any heat at any settings.
> Lately the temp guage will soar to red after 5 to 10 minutes of
> running so I believe it must be a stuck thermostat....yes?

With no heat to the interior, I would always start looking at low water
level (or a massive air lock) before anything else. If the water is low
enough to fail to reach the heater, I'd rectify it pronto.
>
> A bit of research has discovered that the thermostat seems
> in-line....or in-hose to be more presise. Just curious if I need to
> remove the (vicous fan?) as states in my manual or can I remove
> without messing with it.

Telling us what engine would help to investigate this.
>
> Anything I should be forwarned about? Appreciate any input.
>
>
> Robert

Rich

"Richard Brookman" <[email protected]> wrote in
message news:[email protected]...
> "shamalama@dingdong" <[email protected]> wrote in message
> news:[email protected]...
> >
> >
> > I have had some overheating problems lately on my '99 Disco2,
>
> Diesel or petrol?
>
> > and
> > prior was having sporadic interior heat fluctuations. Sometimes I
> > couldn't get any heat at any settings.
> > Lately the temp guage will soar to red after 5 to 10 minutes of
> > running so I believe it must be a stuck thermostat....yes?
>
> With no heat to the interior, I would always start looking at low water
> level (or a massive air lock) before anything else. If the water is low
> enough to fail to reach the heater, I'd rectify it pronto.
> >
> > A bit of research has discovered that the thermostat seems
> > in-line....or in-hose to be more presise. Just curious if I need to
> > remove the (vicous fan?) as states in my manual or can I remove
> > without messing with it.
>
> Telling us what engine would help to investigate this.
> >
> > Anything I should be forwarned about? Appreciate any input.
> >
> >
> > Robert
>
> Rich

Assuming it's a V8, I'd fear the worst for a cracked block behind a cylinder
liner. The combustion gasses entering the water jacket will blow some
coolant out until the coolant level is below the heater pipes, hence no
heat. As the gasses pass through the system, the temp sender will fluctuate
wildly indeed.
If it's a TD5, disregardd the above and consider head gasket.
Badger.

Hi Rich,
It's a 4L Gas, and the water was low but even after topping up with
coolant/water I was without heat whilst idling in driveway (no rise in
temp guage)

I Just took her for a spin and my heat has returned so, perhaps your
air bubble theory has some merit. I can't believe the Landy dealer
quoted $80.00 Canadian for a replacement thermostat....seems rather
steep to me^(


Robert

>
>Assuming it's a V8, I'd fear the worst for a cracked block behind a cylinder
>liner. The combustion gasses entering the water jacket will blow some
>coolant out until the coolant level is below the heater pipes, hence no
>heat. As the gasses pass through the system, the temp sender will fluctuate
>wildly indeed.
>If it's a TD5, disregardd the above and consider head gasket.
>Badger.
>
Ouch....that just scared the crap outa me! I hope not!
I must say I've had to top up the expansion resevoir every month or so
and occasionally smell coolant after a drive, none leaking though.
I've also been noticing condensation on the inner windshield that
seems to come from windshield heating vents. This is mostly when the
weather is rainy though.

Sigh.....

Robert

"shamalama@dingdong" <[email protected]> wrote in message
news:[email protected]...
>
> >
> >Assuming it's a V8, I'd fear the worst for a cracked block behind a
cylinder
> >liner. The combustion gasses entering the water jacket will blow some
> >coolant out until the coolant level is below the heater pipes, hence no
> >heat. As the gasses pass through the system, the temp sender will
fluctuate
> >wildly indeed.
> >If it's a TD5, disregardd the above and consider head gasket.
> >Badger.
> >
> Ouch....that just scared the crap outa me! I hope not!
> I must say I've had to top up the expansion resevoir every month or so
> and occasionally smell coolant after a drive, none leaking though.
> I've also been noticing condensation on the inner windshield that
> seems to come from windshield heating vents. This is mostly when the
> weather is rainy though.
>
> Sigh.....

In that case, check very carefully around the coolant pipes entering the
heater matrix inside the car. This is a very common leak point for P38
rangerovers although I haven't came across it on a Disco II - yet!
If there is a need to top it up, then the coolant has to be going somewhere,
it can't just evaporate out of a sealed system, the problem is finding the
leak especially if it's a very small one as the hot coolant will tend to
dissapear as quick as it leaks out. The fact that you mention condensation
on the inside of the vehicle leads me to think more towards a leak around
the heater unit somewhere.
Doesn't explain the temp cycling issue though, that could indeed be down to
the thermostat. It's easy to change, no need to remove fan etc, it's at the
rear of the radiator fitted in the coolant hose just inboard of the battery,
a big off-white coloured plastic lump with (I think) 3 pipes connecting to
it. Junk the standard springy hose clips and fit the new one using decent
jubilee type clips.
Badger.

shamalama@dingdong wrote:

|| Hi Rich,
|| It's a 4L Gas, and the water was low but even after topping up with
|| coolant/water I was without heat whilst idling in driveway (no rise
|| in temp guage)

Easy to fill it and still leave an air lock in the heater circuit - ISTR
they have special little bleed valves up that end of the system to account
for this. I know that refilling with coolant is a bit more involved than
pour it in and fire it up.

|| I Just took her for a spin and my heat has returned so, perhaps your
|| air bubble theory has some merit.

So it's filled the heater pipes - and now you'll need to top it up again,
right?

Don't listen to me - Badger's your man for V8s.

--
Rich
==============================

Take out the obvious to email me.

I very much appreciate the depth of knowledge you possess. I will
look into the coolant pipe leaks as it makes a lot of sense.

If you're ever stuck for info on record/CD production, I hope I can
impress you equally....hehe

Thanks for the tips



Robert





On Fri, 22 Sep 2006 09:00:39 +0100, "Badger"
<[email protected]> wrote:

>
>"shamalama@dingdong" <[email protected]> wrote in message
>news:[email protected]...
>>
>> >
>> >Assuming it's a V8, I'd fear the worst for a cracked block behind a
>cylinder
>> >liner. The combustion gasses entering the water jacket will blow some
>> >coolant out until the coolant level is below the heater pipes, hence no
>> >heat. As the gasses pass through the system, the temp sender will
>fluctuate
>> >wildly indeed.
>> >If it's a TD5, disregardd the above and consider head gasket.
>> >Badger.
>> >
>> Ouch....that just scared the crap outa me! I hope not!
>> I must say I've had to top up the expansion resevoir every month or so
>> and occasionally smell coolant after a drive, none leaking though.
>> I've also been noticing condensation on the inner windshield that
>> seems to come from windshield heating vents. This is mostly when the
>> weather is rainy though.
>>
>> Sigh.....
>
>In that case, check very carefully around the coolant pipes entering the
>heater matrix inside the car. This is a very common leak point for P38
>rangerovers although I haven't came across it on a Disco II - yet!
>If there is a need to top it up, then the coolant has to be going somewhere,
>it can't just evaporate out of a sealed system, the problem is finding the
>leak especially if it's a very small one as the hot coolant will tend to
>dissapear as quick as it leaks out. The fact that you mention condensation
>on the inside of the vehicle leads me to think more towards a leak around
>the heater unit somewhere.
>Doesn't explain the temp cycling issue though, that could indeed be down to
>the thermostat. It's easy to change, no need to remove fan etc, it's at the
>rear of the radiator fitted in the coolant hose just inboard of the battery,
>a big off-white coloured plastic lump with (I think) 3 pipes connecting to
>it. Junk the standard springy hose clips and fit the new one using decent
>jubilee type clips.
>Badger.
>