Thread: More over heating

I just got my New Aluminum radiator and Viscous fan coupling put in on my over heating 3.5 v8 on gas, WHAT A DIFFERENCE! had trouble putting the fan shroud back on so left off (yeah yeah I know bad bad bad) but I do mainly highway k's all country, its gone from sitting 3/4s the gauge to sitting between 1/4 to 1/2, The new coupling does not roar when cold, but the fan is audible when on the just hot side and the temp quickly drops.

Finally pressured up the coolant system and put a boreoscope into numbers 1,7 2 and eight cylinders.

If the head is leaking into the coolant system these are the only cylinders water can get into. No water not even a slight sign of it. I know it is easier for gas to get out than for water to get in but a fully pressured system should produce at least a damp spot. :-/

hey Flemo do you think its the new radiator or the coupling?? did your coupling have any signs of unhappiness....weeping etc.

Ok run out of head gasket checks.

Gina
As the thermostat provides flow regulation as well as temperature control, running fine without a thermostat fitted could be an indicator of a blockage somewhere in the system

Shouldn't you replace the thermostat?

Sent from my GT-P5210 using AULRO mobile app

Hmmm

Flow regulation??? the Tridon thermostats are more along the line of flow disruption and turbulence creators with the built in loveliness that failure means catastrophic overheating .

I can find no evidence of a blockage of any kind. The radiator inspects well using a boroscope internally and a torch and mirror externally. what goes in the top comes out the bottom very quickly and with apparent full flow.

The heads and block flow very well as does the return lines through the inlet manifold , heater and etc.

There is evidence of active corrosion that I will trial resolution using sacrificial anodes.

In Sydney the ambient temp this time of year is around 20C , The Disco comes up to temp in around eight minutes and stays put no ups no downs nailed just below the little wavy water thing on the gauge that's around four needle widths below half.
I will stick in a temp sensor and give a reading of what that is in deg C .

Thermostats are only required if the engine is overcool. Overheat and they open as far as they will and do no more. My engine is not overcool. I suppose that the thermo gets the engine up to temp a lot quicker...say three minutes instead of eight . If I was in very cold climate , snow and ice etc etc and overcooling was a problem ...well I would find a hi flo low turbulence thermostat and install it.
The viscous coupled fan acts as a thermostatic control as do the twin electric fans on the front of the radiator . -

Yes after the coupling was off (was seized on badly) there looks to be some leakage from it, its spun up and roared when the car was cold, but could never hear the fan even when it was over 3/4's hot.
Had put a new water pump in and thermostat early last year to no effect, took the rover for a big run last night, Flogging it up hills and a 110km/h highway and some steep off road that used to get it up 3/4's in less then 2 minutes, the gauge did not go off half way AT ALL, in fact when running on the highway it went closer to a quarter. I noticed im getting better fuel economy too for some reason, so win all round.

Anyone tried these??

Land Rover Discovery TDI300 V8 Expansion Tank Heavy Duty Reinforced Tube | eBay

Dave

I can hear a "roar" (fan) at different times when engine is supposedly at running temp, usually when putting more load on i.e. going up a hill, accelerating, even worse when towing. Have turned motor off after driving for 1/2 an hour or more & can hand spin fan with 1 finger, is this right?