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fan on discovery

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crazymac:

--- Quote from: SteveGoodz on March 06, 2010, 11:49:01 ---Crazymac, I'm aware of that but they don't come on until the temperature is around 100 C and they are timed to run for 10 minutes only. In my view, that's too little - too late to be certain not to blow the head gasket.


--- End quote ---

But thats not what you said

--- Quote from: SteveGoodz on March 05, 2010, 20:01:58 ---Hi Arnie,

Those electric fans are part of the air conditioning system and only come on when the aircon is in use. I'm sure that they could be rewired as normal cooling fans but it might be a bit of a job.
--- End quote ---

I have no idea what the temp is they kick in at so i'll take your word for that, its just over the half way mark on my gauge which is ample time on mine to bring the temp back down, maybe because I don't have the aircon rad it makes it easier for the air to flow?

SteveGoodz:

--- Quote from: crazymac on March 06, 2010, 12:25:15 ---
But thats not what you said


--- End quote ---

I know, I was trying to keep it simple :-)

Saffy:

--- Quote from: SteveGoodz on March 06, 2010, 11:49:01 ---
Crazymac, I'm aware of that but they don't come on until the temperature is around 100 C and they are timed to run for 10 minutes only. In my view, that's too little - too late to be certain not to blow the head gasket.

YMMV :-)


--- End quote ---

isn't the 10minute thing only for after engine/ignition has been turned off and they run as long as needed when engine running?

Hightower:
When I removed my viscous I replaced it with a double fan setup from a Freelander.  Big Rich made up a frame for it and it sits perfectly behind my rad.  Wired in so it's off, on or switched by thermostat.

Job done.

Range Rover Blues:
Just bear in mind that a pair of electrics can only shift about half as much air as a viscous in good nickm they will cost easily twice what a new viscous unit will cost if you buy good ones and still not be as good.

I was advised by Kenlowe NOT to fit electrics, so I spent the cash on a new rad and visocus hub.  Job done.

The air conn fans will run if the underbonnet reaches above 60degrees on a V8 that is shut down, that is driven by the engine ECU to keep the fuel from boiling.

They also switch on if the engine overheats because the airconn rad can block the engine rad even if the airconn isn't running.

Plus of coourse they come on as soon as the airconn is switched on, unless you turn the heater blower off!

There is a thermostatic scitch in the thermostat elbow to run the airconn fans but as said the engine has to get quite hot before this happens, I wouldn't rely on it to protect a V8 on it's own.

Blue doesn't have airconn and it came fitted with twin kenlowes, they are ok but when I'm greenleaning is when it gets hottest and the fans pull and awful lot of current, they have melted a apir of 30 amp fused relays before now and shredded a new fanbelt in about 3 hours!  they put a lot of strain on the electrics when thay are running.

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