90 xs questions from newbie

Hi all,
had the 90 for six months so hardly a newbie !
I will do a search but thought i would try this. It takes ages to warm up, is this normal ? The top hose is warm quickly, even if the guage is cold, i know with my Griff it would be thermostat.
Also the performance and "noise" varies from day to day, been back to the indie but "no fault". The Turbo you can hear slowing when you turn off the engine, it not exactly noisey, just not sure if this is normal.

Thanks in advance.

Davie B

What engine matey?

av got a td5 and it takes around 5 min if its realy cold air tenp it mite take a bit longer to get warm the reason it tht the td5 has 9.5 ltrs of oil and 12 ltrs of coolent to warm up

lro2006 said:

av got a td5 and it takes around 5 min if its realy cold air tenp it mite take a bit longer to get warm the reason it tht the td5 has 9.5 ltrs of oil and 12 ltrs of coolent to warm up

Click to expand...

NO.

The reason is because the thermostat doesn't work only on temperature, It also works on pressure. when the engine revs exceed 1500rpm the coolant uses a bypass valve to circulate coolant no matter what the temperature. This keeps your vehicle cooler when driving in hot climates and warmer when sat on tickover in cold climates.

On the picture of the TD5's unconventional looking thermostat below the top and bottom connections are the conventional top and bottom hose connections. The feed of on the angle is for the bypass. The coolant is drawn from this, directly into the water pump.

Whoops, should of said 2004 TD5 90xs with loads of bits and bobs ! I will have to get some pics together.
Iam not new to LRs, had 3 Rangies in the past 10 years, nearly bought a 2004 Rangie, thank goodness i bought the 90 in view of whats been going on !

The guage just gets to about 1/3 rd after 8 miles and 10 minutes.

That noise you hear after turning off the engine is not the turbo, it's the centrifugal oil filter slowing down. The noise is normal.
My TD5 takes ages to warm up (well, ages for the heater to do any heating) on cold days....that's normal too.

Ok, understand it a bit more. The top hose may get warm early but the rad doesnt so the stat is still closed. Where does the bypass, bypass to ? I see a small amount into the expansion tank but that was so with the p38 and that warmed up quickly, in fact i have had 6 Rover V8s(3 tvr) and they all warmed quickly. It would just be nice to have heat before i get to the office, without having to put cardboard across the front, like in the old days.

Davie B said:

Ok, understand it a bit more. The top hose may get warm early but the rad doesnt so the stat is still closed. Where does the bypass, bypass to ? I see a small amount into the expansion tank but that was so with the p38 and that warmed up quickly, in fact i have had 6 Rover V8s(3 tvr) and they all warmed quickly. It would just be nice to have heat before i get to the office, without having to put cardboard across the front, like in the old days.

Click to expand...

The cooling system uses a 50/50 antifreeze/water mix. The specified antifreeze to be used in this application is
Texaco XLC. The capacity of the system is approximately 10 litres. The workshop manual details the procedure to
drain and refill the cooling system.
The cooling system hoses have been fabricated to incorporate a thermostat housing. This thermostat housing has
three hose connections. The coolant is drawn into the water pump via hose (F) from either the heater matrix
circuit (D) or from the thermostat housing (A). When the thermostat ( is closed, the water pump will draw fluid
from the bypass hose (E). Before it is able to do this, it will need to overcome a spring-loaded valve (C) inside
the thermostat housing (A). This spring is rated so that, when the engine speed is below approximately 1500 rev/min,
all the coolant will circulate around the heater circuit (D). This serves to aid fast �warm-up� when the vehicle
is operated in cold climate conditions. If the engine speed exceeds approximately 1500 rev/min, the suction the water
pump creates will be sufficently strong to lift the spring-loaded valve (C) off its seat. This will allow coolant to
circulate through the bypass hose (E), as well as through the heater circuit (D). When the coolant temperature exceeds
82�C (180�F), the thermostat ( will open, allowing the coolant to flow through the top hose (E), through the
radiator and into the thermostat housing, via hose (G). Finally, it will be drawn into the water pump via hose (F).

Depending on the driving, mine takes 10 mins to get up to running temp, sometimes more on a cold day. And yes the noise is normal, it's the centridugal oil filter spinning down as lightning correctly said.

Theres nowt wrong with yours by the sounds of it.

A v8 will always warm more quickly than a diesel. You could always fit an electric fan, that doesnt run until engine is up to temp, should help the engine warm quicker.