tonytherunner · Oct 23, 2017

So in little disappointed why LR engineer choose this parameter. i monitoring some data on torque pro ,fan starts at 105 degree c what is to much.i have some idea in my mind but i want to ask here maybe is anyone who knows a easy way.
Well i need to go around 94- 95 degree c,at this temperature fan need to starts.

Nodge68 · Oct 23, 2017

Why is 105°C to hot for the fan to start?
The fan on temperature is deliberately high, so it ensures the thermostat is fully open when it starts up. If the stat isn't fully open, then the coolant is over cool when the stat opens. This would then dump cold water onto the engine, accelerating head gasket failure, on an already HG prone engine. Best bet is to leave well alone and just use it.

tonytherunner · Oct 24, 2017

Actually you right ,partially .This temperature was set for 92 degrees c for the old thermostat ,but new one PRT is opening at 82 C.
Also I think a electric water pump for recylculate water when engine is stop is necessary.

tonytherunner · Oct 25, 2017

And when use AC fan work at high speed,this will be bad for engine ? I don't think so .....

Today after a long ride when temp not go over 90 C ,i keep it at idle for about 5 minutes ,temp rise at 96 ,is there a point why rise at idle ?

I don't want to make overkill thing ,just to keep it healthy.

Thanks

Nodge68 · Oct 25, 2017

tonytherunner said:
And when use AC fan work at high speed,this will be bad for engine ? I don't think so .....

Today after a long ride when temp not go over 90 C ,i keep it at idle for about 5 minutes ,temp rise at 96 ,is there a point why rise at idle ?

I don't want to make overkill thing ,just to keep it healthy.

Thanks

The temperature will rise at idle, if you aren't moving as no air goes through the rad to cool it. This is what the fan is for, to move air through the rad, when the vehicle isn't moving. The fan running because if the AC, won't do any damage to the engine, or over cool it.

tonytherunner · Oct 26, 2017

So if so stop engine after a long ride and temperature is 96 C this will still increase because no fan will work .that's correct ?
On a freelander friend I see the problem ,is overheating even was stopped ,has water pump for recirculation.and fan is controlled by a relay .

GrumpyGel · Oct 26, 2017

Heat is transferred from the engine block into the coolant which is circulated through the radiator where the heat now in the coolant is dissipated.

The coolant is always cooler than the block or else heat wouldn't be transferred to it.

In fact the block itself on the inside where combustion takes place will be many 100's of degrees C.

So it is a continuous transfer of heat from combustion to the block to the coolant, the block nearer combustion will be a lot hotter than the block next to the coolant chambers.

When you turn the engine off, the coolant circulation stops, therefore the coolant that happens to stop around the block has a lot more heat than normal transferred to it. So therefore It will heat up a lot more after the engine has been turned off.

That's my take on it.

Its a similar reason to why a lot of diesels have "turbo timers", ie it will keep the engine ticking over for a couple of minutes after you "turn it off". It does this in case you've been working the engine hard and it is hot, ticking over will allow the whole engine to cool some - presumably with a bias towards specifically letting the turbo cool.

Edit : Whether the fans should come on after turning the engine off I don't know. In many ways it is pointless because the coolant isn't being circulated through the rad, but it would blow cool air into the engine bay.

Nodge68 · Oct 26, 2017

GrumpyGel said:
Heat is transferred from the engine block into the coolant which is circulated through the radiator where the heat now in the coolant is dissipated.

The coolant is always cooler than the block or else heat wouldn't be transferred to it.

In fact the block itself on the inside where combustion takes place will be many 100's of degrees C.

So it is a continuous transfer of heat from combustion to the block to the coolant, the block nearer combustion will be a lot hotter than the block next to the coolant chambers.

When you turn the engine off, the coolant circulation stops, therefore the coolant that happens to stop around the block has a lot more heat than normal transferred to it. So therefore It will heat up a lot more after the engine has been turned off.

That's my take on it.

Its a similar reason to why a lot of diesels have "turbo timers", ie it will keep the engine ticking over for a couple of minutes after you "turn it off". It does this in case you've been working the engine hard and it is hot, ticking over will allow the whole engine to cool some - presumably with a bias towards specifically letting the turbo cool.

Edit : Whether the fans should come on after turning the engine off I don't know. In many ways it is pointless because the coolant isn't being circulated through the rad, but it would blow cool air into the engine bay.

This^^^^

There are a few vehicles that have electric water pumps that run on after shutdown. The Audi 1.8 20 valve as fitted to the RS3 and Audi TT 225 is a common example of this. This Audi engine makes so much heat from its hard worked cylinders, that the designers added post shutdown cooling. The idea is that the coolant is circulated round the engine for about 5 minutes after shutting down. This then passes the heat from the cylinders, out the block and to the rad, where cooling takes place. It's an effective system too, but unnecessary on the Freelander 1.8 engine.

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