Heater fan on full only

That fan is mainly for aircon there but it's used by the engine management too as an additional cooling fan for the engine if it overheats... for the aircon it starts when it's above 25*C outside and for the engine when it reaches 110*C...as long as the speed is not above 100KM/H... it's not bad to have it working... i gave mine to an electric repairs shop and they've rewound the motor for the value of 20 quid here

Hi, yes, the circuit board with the four contacts sticking upwards has to be unsoldered from the three pins that can be seen across the wider end of the circuit board, these three pins are the legs of the MOSFET. Once the solder has been drawn off the three pins and that end of the circuit board is loose on the pins/legs it can be unclipped and will swing up but will still be held by the wires from the thermal fuse. The screw holding the fuse and MOSFET will then be visible.

I used a soldering iron and a solder-sucker to do this when I took my failed unit to pieces. The paste that you will see beneath the MOSFET and the fuse is a special thermal condtuctive paste to ensure very good contact with the heatsink.

I'd not say you were a mug for buying a new one, I'm an electronics engineer and taking this sort of thing apart is what I used to do; if you're not familiar with soldering things like this there are pitfalls. Don't let the legs of the MOSFET get too hot when soldering, you can damage the component as you fit it and heavy use of a soldering iron on the thernal fuse can blow it as you fix it in!

Have you asked at any breaker's yards for a used one?

Hi again, I Googled "Land Rover Discovery condensor fan" and found a US owner who had discovered that it is a common fan used on many makes of vehicle, not just Land Rovers. You may be able to find a working used one if you search around.

thx again guys, im on to breakers at the moment for the part. i can see me ending up with another blower unit just so i can extract the power transistor!

fun times indeed!

this is proving a lot harder than intended. the cost of a new part JGN100011 is crazy! also how come america seems to domainate the search?

been reading a honda forum and the whole concept is identical. whats really annoying is that the pin spacing on the circuit board is different to the one on the landy.

the honda part (79330-S5A-942) is cheaper than the landy one!

its looking like i may have to get an iron, solder sucker and multimeter to test the mosfet and the thermal fuse.

fin times indeed