Thread: auto box heating up fast on disco II

I have never seen my light come on, despite some hard work.

Have you checked the fluid recently.

I think the fluid is right... Well at least the dealership told me it was, although I am coming to mistrust them they have odd quality control! They said they started it from cold and it warmed up fine etc etc. It comes on when working in the sand and up long inclines at say 80kph plus (for perth people, welshpool road or greenmount hill for example) on hot days. Maybe the electrical fault is something to do with it, if the aircon has not been re-routed as in RAVE manual?
Thanks for the reply though,
Dave

I have had my light come on when playing in the sand. Much better to put it in manual mode and lock it into a gear.

If it has overheated a couple of times it might be worth checking the oil to make sure you have not burnt it...very easy to do and from what I am told you can damage the box running it with burnt oil.

Hi,
Maybe you get hold of one of those infrared temp sensors they check the air conditioner outlets to check the gearbox temp when the light is coming on. If it's ok then you know you have some type of electrical problem. If it is really is overheating then you will know that it needs to be looked at quickly before the box is destroyed inside.

I have a disco II as well and it gets pretty hot in summer on the beach north of Karratha WA and have never had it come on. Even when it's 45 plus and running on the sand to go fishing.

I would put money on your ATF cooler being blocked full of mud. $5000 and a lot of heartache with fitting additional coolers was how I found out. Now I'm back to standard again. This is what it looked like - totally blocked, and yes, they're an absolute bitch to get to, let alone clean (middle radiator pack and at the bottom)

I second that Idea and will throw in the thermal flow valve may be sticky.

Originally Posted by Blknight.aus

I second that Idea and will throw in the thermal flow valve may be sticky.

How would you check that?

with great difficulty.....

fit a bypass hose with a hydraulic combo gauge (pressure, flow and temp) and take it for a drive while you observe it.