Fan Blower In/Op

Post by **Tim Leech** » Tue Apr 17, 2012 9:55 am

I know its probably been covered lots of times before so sorry to duplicate, my 19TZD is in having a new clutch and cambelt today. I noticed driving it to work today the fan blower wasnt working, it worked fine before I parked it up at the end of January.

I fiddled with the control a bit and it worked a little bit, but then stopped again!, As were off to France in a few weeks it needs to work!

Cheers!

Post by **mat_fenwick** » Tue Apr 17, 2012 10:25 am

Could be a number of things but if you are happy pulling of the panel in front of the heater controls you can check the most common cause. On top of the heater PCB you will see a row of 5 terminals where the loom connector comes in from behind. Temporarily touch a well earthed wire to the middle terminal (no. 3) and see if the blower works normally after that.
There's been a bit on my blog about it recently, but don't think I took pictures.

Post by **Tim Leech** » Tue Apr 17, 2012 10:44 am

Thanks Matt will do, (PCB?

)

Post by **mat_fenwick** » Tue Apr 17, 2012 10:54 am

This might help...not my photo though.

Post by **Tim Leech** » Tue Apr 17, 2012 11:06 am

Seen them before! Just wondereed what PCD stands for,

Post by **mat_fenwick** » Tue Apr 17, 2012 11:15 am

Sorry, wasn't suggesting that you didn't know what a PCB was! Just thought a picture might help.

Just wondereed what PCD stands for

PCD (;)) stands for Pitch Circle Diameter, PCB for Printed Circuit Board

citronut · Post by **citronut** » Tue Apr 17, 2012 1:07 pm

Roverman wrote:Seen them before! Just wondereed what PCD stands for,

or printed circuit dead

regards malcolm

Post by **Defender110** » Tue Apr 17, 2012 1:42 pm

Come on Tim keep up;

It's all covered in Technical frequently asked questions 'the definative heater mod' even if your not moding the fault diagnosis is in there.

http://www.bxclub.co.uk/forum/viewtopic.php?t=5515

Post by **Tim Leech** » Tue Apr 17, 2012 2:02 pm

My brains fried Kev, the amount of money the CCC is costing me is making me go all faint, will have a go at that then. But it could be the realy under the column we think?

Post by **mat_fenwick** » Tue Apr 17, 2012 2:26 pm

Very unlikely to be the relay. Try earthing terminal 3 and report back what happens.

If all else fails something temporary can be rigged up (on or off), assuming motor OK. Or just drive faster! I went to France in the van last summer, and temperatures were over 40°C. It was whilst stuck in traffic, sitting on top of the engine, I started to wish I'd fixed the siezed blower motor before we set off...

Post by **Tim Leech** » Tue Apr 17, 2012 4:58 pm

Cheers chaps when its back together I will take the dash to bits and have a look at the PCB/D

Its probably just needs cleaning as it worked fine before.

Post by **Defender110** » Tue Apr 17, 2012 10:06 pm

Roverman wrote: Its probably just needs cleaning as it worked fine before.

They all do until they don't!

Post by **Tim Leech** » Sun May 06, 2012 12:59 pm

mat_fenwick wrote:Could be a number of things but if you are happy pulling of the panel in front of the heater controls you can check the most common cause. On top of the heater PCB you will see a row of 5 terminals where the loom connector comes in from behind. Temporarily touch a well earthed wire to the middle terminal (no. 3) and see if the blower works normally after that.
There's been a bit on my blog about it recently, but don't think I took pictures.

Right to ressurect this thread, I ran a wire from the curcuit board to the earth and HEY PRESTO the blowers fine, so could it be the relay or PCB? I have a spare untested PCB which I tried but that made no difference.

Post by **mat_fenwick** » Sun May 06, 2012 2:23 pm

You've proved that the problem is a lack of a decent earth to terminal 3 so not the relay or PCB at fault. If it works when you bridge terminals 3 and 4 then you could just try linking together the corresponding wires, as 4 is also an earth for the panel lights.

Post by **Tim Leech** » Sun May 06, 2012 3:24 pm

Hi Mat

Yes put a wire from three to four and on it cames and adjust up and down with the dial, where should I look for the bad earth please?

Thanks!