205 diesel fan wiring conversion

[2052006 10]

Hello all,

 

I have just about come to the end of supercharging (rotrex) my gti6 engine.  As such I am using a shortened rad.  At the moment I have one small (space is rather restricted) Spal fan attached to the new rad.  

 

At idle, it does the job, but appears to take longer to bring the temp down than my old standard set-up - this was the standard single fan.

 

Currently, the Spal is connected simply by using the old wiring (out of which I removed the resistor long ago).  I understand that this wiring set-up is not ideal anyway.  And now I am thinking I might have to install a second Spal (I just about have space) as I am concerned that with summer temps and sitting in traffic, 1 may not suffice.

 

My question is, would I therefore be best using the fan wiring loom, controlled by relays, from a 205 diesel, which by all accounts is a better, more reliable setup anyway.  Would this be the most simple way to add a second, aftermarket fan?

 

Thanks,

 

Pete

[welshpug 1,682]

yes, it would be ideal as it is set up for low and high speed and isolates the thermoswitch from the full current draw of the fans.

[2052006 10]

Am I right in saying it would more or less plug straight in (barring things like needing the correct plug from the aftermarket fan etc)?

[welshpug 1,682]

indeed, plugs into the shunt box and uses the original earth, and the red 2 pin switched ignition live

[2052006 10]

Thanks.  Do these looms have a plug for each fan, or would I need to splice in the second fan (if so, any pointers as to the best way to do this?).

[jackherer 543]

Which model SPAL fan are you using? I struggled with cheap generic fans on my shortened rad until I got a SPAL which cools it down really quickly.

 

This is the fan I bought https://www.ebay.co.uk/itm/113720129661

[2052006 10]

Mine is a SPAL VA22-AP11/C - it is a lot smaller than the one you're using - I was quite restricted on depth and diameter, so I'm guessing this is the problem.  I suspected this might be the case, but thought I'd see how I get on with one.

 

Although when it switches on, it stops the temp climbing any further, it struggles to reduce it - I'm thinking this will likely be a problem come summer and also hotter engine temps generally - I've hardly driven it as is, so it's not got as warm as it might.

 

What do you think?

[jackherer 543]

OK that is quite small! I guess you have superchargers and intercoolers in the way...

 

Yours is rated at 313 cfm which is 532 m3/h compared to 1280 m3/h for mine. But yours is pulling which is more efficient so two of those should be about the same airflow as one of mine pushing I would say.

 

Mine was OK with the cheap low profile generic fans most of the time, just a bit slower to cool than the standard arrangement. But occasionally under more extreme conditions they wouldn't cope and the gauge would slowly climb. It took years to get to the bottom of it because it doesn't get pushed to the limit very often as it takes very specific circumstances.

 

 

[2052006 10]

Thanks for that, yes I had seen your thread in my searching.

 

Yes - I have the traction fluid cooler in front of the main rad as well, which won't be helping matters.  And yes, it's a pull - solely because there was no space in front, though I'm glad to hear it's more efficient.

 

I think I will order a second fan then.  If I swap to a twin fan loom, what would be the best way to connect the second fan - I assume those looms don't come with two fan connections, or am I wrong (I can't see two in the photos I can find)?

 

Also, Kieran, did you have a problem getting the rad temp switch to seal properly on the shortened rad?  Despite using liberal amounts of PTFE, it still weeps ever so slightly.  I'm wondering if this is because the standard rad has plastic end tanks, giving a better seal against the switch/washer?

[jackherer 543]

I'm pretty certain the twin fan loom has two fan plugs, you'll just need to adapt them to your fans.

 

I don't have a temp switch in the rad, I use my ECU to control the fans. I can't remember what I have in place of the switch but it definitely doesn't leak. The only place I've seen leak on mine is the drain plug, after a long hard day on the rollers there was a 5p size pool of coolant under it so it's the slowest leak I've ever seen.

[Tom Fenton 1,582]

You need to seal the fan switch on the faces not the threads. Use a copper crush washer. I’ve never had a problem with them leaking from there.

[2052006 10]

Thanks both.  I take it this is the type of loom I need?

 

https://www.ebay.co.uk/itm/peugeot-205-1-9-1-6-gti-Twin-Fan-Conversion-Wiring-Loom-And-Relays/402082927713?fits=Model%3A205&hash=item5d9e029461:g:jtAAAOSwbw1aFpn3

[jackherer 543]

Yes or this one - https://www.ebay.co.uk/itm/133345061471

 

[jackherer 543]

I can see two grey fan connectors on both of those listings BTW.

[2052006 10]

Yes, I see what you mean.  Thanks!

[2052006 10]

I’ll be needing another plug/connector from an OE fan.  Apart from a 205, does anybody know what models used the same plug, if any?  
There are some 306s in my local scrappy, but no 205s.

Or if the same plug features anywhere else on a 205/another model?

Any ideas?