75ZT Community

Not sure if anyone has come across this, but a chap round the corner popped in this morning. ATC (Automatic Temperature Control) panel is lighting up fine, no faults displayed, but the blower is completely dead. Did a quick check of the fuses and relay and they look OK, but didn't have time to dig further (family arriving soon). It sounds a bit like the transistor pack. I seem to remember someone having this issue on one of the forums, but can't recall the outcome.

It could very well be the Transistor Pack has failed in some way.
Some info here. http://forums.mg-rover.org/showthread.php?t=393460

I think I know this one Duncan. There's a regulator for the fan which has a big alloy heat-sink. It usually fails by intermittently rather than total catastrophic failure. If there isn't a Rover part available I understand Range / Land Rover have identical parts. IIRC, you can repair it though - power transistor replacement.

I can't remember much more about it. Keith Alexander showed me one many years ago.

EDIT - just read the link Mick added - makes this post redundant

Brilliant info guys. Thanks. I didn't try it on absolute maximum, but now I know they can fail, I'd put money on it being this.

Would this be in this area in the photo's below somewhere if so i am sure i took one of a car last year and it will be in the shed maybe something i can bring to next meet for you guys to take a gander at Arctic.

Yes, that's the beast. Though it's shown in the drivers footwell in the workshop manual!

On some cars, theres a resistor pack there instead (if they don't have ATC).

OK, some feedback.

He came round again this evening. He wanted to come to the Nano but is attending hospital daily so couldn't.

I swapped the transistor pack with the one of my V6 as I'm not using it right now. Worked a treat.

So I thought I'd have a look at fixing it. It doesn't look like the one in the thread, but that's for a ZS not a 75/ZT. There's one FET (a type of transistor) which seems to have failed, but also a thermal fuse which has also apparently died. About £7 worth so I'm going to have a go at fixing it. The chap concerned is nipping to the scrappy to get me a replacement anyway.