Intermittent Overheating

nah · 10th March 2004, 04:29 PM

Its a kind of love-hate relationship....but i couldn't think of another type of 4wd I'd prefer to have so i guess i must like the pain :? maybe we all do :wink:

**LandyAndy** · 10th March 2004, 05:46 PM

Hi Guys
If you ever suspect a viscous hub is causing overheating(a common problem with all vehicles) you need to get some soft wire and wire the viscous hub to the driven hub,if the overheating problem is solved the viscous hub is defective.DONT leave the wire in place for a long reiod,it will un-balance the fan and lead to waterpump bearing problems,and if the wire breaks it could cause all sorts of damage.
Some prople screw a tek screw into the hub as an emergency fix but not good practice.
Cheers
Andrew

**landrovermick** · 11th March 2004, 08:37 PM

Hey there guys Im told that the viscous unit is the same as the one used in XF Falcons.....

worth a try - the bloke who knows is at Range Repairs in Rochester Vic - is listed in suppliers forum

Mick

**Surferjim** · 30th June 2004, 08:40 PM

I see from a previous thread that there was some overheating on a disco:

Has anyone experianced this intermitent over heating on an S 3? Mine intermittently hovers at 2/3 hot and just on the red line in the city. Engine sounds OK, coolant levels fine, fan on all the time.

Seems only to have happened after some minor bush bashing last weekend. What could this be?

Also - can the engine be damaged if the temp is on the red line (but not in it).

Help, as always, appreciated - hopefully my questions will become less mundane once my workshop cd arrives!

**sickgm** · 3rd October 2008, 07:19 PM

This is just my 2cents worth. I have had similar problems, temps creeps up to 3/4's and we did everything mentioned here, viscous, rad unblocked, thermostat and nothing helped. Took it for a run with the mechanic, got it up to 3/4's and we got back to the workshop and we stuck a infared thermo to check temperature. No area in the engine was hotter than 92 degrees. He concludes that it could be a faulty sender unit in the gauge..

Hope that helps.... $30 for the sender for my 93 disco.... worth a try

**PAT303** · 3rd October 2008, 11:09 PM

Originally Posted by bigbugga

Land rovers are like that sometimes.

Just when you think you have them beat they come back and bite you again.

My defender hasn't broken down in 8 years,ever since I stopped taking it to a dealer,all to keep my warranty that I used up getting it fixed after the dealer ''mechanics'' found more things to stuff up. Pat

**PhilipA** · 4th October 2008, 08:56 AM

Just to clarify the viscous fan operation on a V8 RRC anyway.
When you start in the morning the viscous fluid has settled to the bottom of the fan. This initially causes the fan to be stiff. As the fluid is distributed around the fan, it will become easier to turn after a few seconds.

The stiffness of the fan at operating temperature is determined by the temperature sensed by the "spring thing" which sits in the middle of the fan.

When the radiator is cool ( eg just cruising along), the air on the spring is cool and it does not expand the spring. When the air through the radiator gets hot eg low range work on a hot day, the spring expands and turns a disc in the fan boss which closes an orifice which restricts the flow of fluid and thus makes it stiffer.
So the stiffness you feel at the fan at operating temp will depend on what the car has been doing.
I can quite clearly hear my fan start to roar when it stiffens when the car is working hard.
Under normal circumstances the fan is quite easy to turn. You should be able to turn the fan easily with your little finger after the car has run. It will be stiffer if you test it when the car has not run for several hours.
Another reason the old viscous is a better idea than electrics IMHO.
Regards Philip A

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