Thermo fan

[Quinzi]

just a quick question, I want to get rid of my clutch fan and put thermo fan/fans on my vp hsv v8, I have been told the vs v6 one will fit on with minor modifications, is this a good idea or what do people usually use?

[con7502003]

i put vt ones on my vn 5ltr everyone reckons there no good but they work fine on mine and a real easy fit

[fu2]

au thermos seem to be the most popular choice

[Quinzi]

thanks guys

[Quinzi]

next question, what do ya do with the canister, sits right in the way of where the thermos sit???

[Reaper]

I used AU thermo's which fitted with minor modifications. You can wire it thru the relay that is in the box next to the RHS shock tower - all the wiring is there for the v6 although you will need to upgrade the fuse and turn it on in the ECU. As for the carbon canister, I just bent it out of the way.

I have seen some others post that a Ford Mondeo thermo also fits very well however I've never seen one in person to be sure.

Reaper

[kniever]

as above i also used au thermo fans and they are quite powerful and work very well, the carbon canister i moved to between the battery and power steering, fits well and doesn't move.

[Vt-Brrrlina]

ive used a the au thermos, they work MINT!!!!!!!//... as for the charcoal canister someone gave a me a great idea not long ago, its been moved down near the vacuum ball thingy passenger side of the car just extended the hoses..

[stocky]

i moved the canister behind the front bar on the passenger side, just ran a longer hose for it. cleaned up the bay a bit and its still functional

[wrx884]

Hey Guys thought id ask here as i couldnt find wat im lookin 4 in other threads. Ive put in AU thermo fans in my VP 5L running off a manual switch thats then wired up to 2 relays (one 4 each fan) that works fine. Tho now ive had my memcal enabled so i can run it through the ECU so i can do away with the manual switch but i just have a couple things i need 2 find out 2 complete it properly.

1st thing the ECU on the 5L's only have the 1 pin out that im supposed 2 use (unlike the V6's that have 2) which is used by the A/C fan. The set temps on the memcal r working as ive noticed with out touching the wiring yet the A/C fan kicks in at certain temps so thats good. Tho wat i wanna know is will i still b able 2 use my A/C fan as per normal wen the A/C is switched on if i hook up the AU thermos 2 this pin out? or will i find the AU thermos will turn on along with the A/C fan?

Ive also notice the A/C fan seems 2 suck air out of the front of the car is that normal? or should it suck air in the same way the AU thermos do? just a bit concerned that if i do decide 2 use aircon they will b kinda fighting against each other? so is there a way around this?

let us know if any1 else has gone down that path as a few guys ive talked 2 so far hasnt really said much or anything at all.

cheers.

[Cheap6]

There's only one pin for switching the cooling fan whether it's a V8 or V6, VN or VP; they use the same ECM, just the MemCal is different.

The A/C fan should push air through from the grille side to the engine side of the radiator.

The only difference in the way that the V8 and V6 fans operate is the switching temps. Is that what was changed in the MemCal?

[Circlotron]

What would you expect to pay for a set of AU fans?

[mr calais 5.0]

Would Ed/el ford twin fans fit with out much modding?

[wrx884]

Im sure the diagram 4 the V6 ECU had 2 pin outs? 1 being the A/C pin out and the other 4 the thermo fan but i could b wrong as i only have a 5L wiring diagram and only saw a V6 1 breifly.

But yeah the memcal has been enabled so it can operate the thermos switching temps (as if it was a V6), which with only having the 1 pin out i think it mayb confusing the A/C fan thinking its the V6 thermo fan now which is telling me the memcal is doing its job but again i dont know how the A/C and thermos fans r supposed 2 opperate 2gether?

Yeah my A/C fan is pushing the air out of the front of the grill and not 2wards the engine (like the AU thermos do) which is y i think its working against each other if they r supposed 2 all work at the same time using this 1 pin out?

after ive sussed this out i want 2 use that A/C pin out if thats wat im supposed 2 hook the AU thermos up 2? so they work off the ECU and do away with the manual switch.

What would you expect to pay for a set of AU fans?

I paid $60 4 mine through the local paper. was gettin a few wreckers wanting $80-$110 tho

[wrx884]

does any1 have a V6 ECU wiring diagram 2 check if they did have only the 1 or 2 pin outs???

[kniever]

to answer your original question wrx884, just pull the a/c fan off now you wont need it as the au fans are more than powerful enough to look after the whole system.

you will notice when you turn the a/c on that the fans will turn on straight away and still turn on/off automatically when a/c is not in use.

also if you are looking for the signal wire now the function is turned i just used the blue wire (#85 on the a/c fan relay) saves running a long wire from the ecu

[wrx884]

to answer your original question wrx884, just pull the a/c fan off now you wont need it as the au fans are more than powerful enough to look after the whole system.

you will notice when you turn the a/c on that the fans will turn on straight away and still turn on/off automatically when a/c is not in use.

also if you are looking for the signal wire now the function is turned i just used the blue wire (#85 on the a/c fan relay) saves running a long wire from the ecu

Yeah? ok i'll give that a go and see how it goes cheers man

[Cheap6]

Im sure the diagram 4 the V6 ECU had 2 pin outs? 1 being the A/C pin out and the other 4 the thermo fan but i could b wrong as i only have a 5L wiring diagram and only saw a V6 1 breifly.

But yeah the memcal has been enabled so it can operate the thermos switching temps (as if it was a V6), which with only having the 1 pin out i think it mayb confusing the A/C fan thinking its the V6 thermo fan now which is telling me the memcal is doing its job but again i dont know how the A/C and thermos fans r supposed 2 opperate 2gether?

Yeah my A/C fan is pushing the air out of the front of the grill and not 2wards the engine (like the AU thermos do) which is y i think its working against each other if they r supposed 2 all work at the same time using this 1 pin out?

after ive sussed this out i want 2 use that A/C pin out if thats wat im supposed 2 hook the AU thermos up 2? so they work off the ECU and do away with the manual switch.

The A/C auxiliary fan on V8 or the single cooling fan on V6 are each switched via the ECM on C1, which is connected to the switching side of the relevant fan relay - one or the other only on OEM. There is no auxiliary fan and cooling fan switching.

The current draw through a relay is quite low so you may get away with switching both (or indeed all three if you retain the aux. fan) of the new fan relays to earth in parallel via C1. If there is any doubt, safer will be to use the ECM to switch a transitor or even another (low amp? - all that is required) relay that will switch the other relays (wired in parallel).

The A/C connections at the ECM are an input on B8, indicating to the ECM that the A/C temp., A/C control, interior fan and A/C pressure switches - in series - are all closed, and an output that switches the A/C compressor relay by earthing C2.

On a V8 the aux. fan is switched on with a coolant temp. of 107C and off at 101C as a compensation for extreme conditions.

V6 is on at 102C, off at 99C, normal operating temps..

There may be some variation depending on which MemCal is used but those are pretty typical.

Both the V6 and V8 fans are on with A/C input on B8 and road speed below 55km/h.

If you are using the ECM to switch a fan or fans to provide normal cooling on a V8 the switching temp. in the MemCal has to be lowered, even lower than the V6 temps. because the V8s run cooler than V6. As a good indication of 304 running temps., the switching temps. for VT 304 are in the "How To" by immortality on switching the fan manually. It would be a good idea, if you have not done so already (^...^?) to check what temp. the MemCal is switching at against those VT temps.

[wrx884]

The A/C auxiliary fan on V8 or the single cooling fan on V6 are each switched via the ECM on C1, which is connected to the switching side of the relevant fan relay - one or the other only on OEM. There is no auxiliary fan and cooling fan switching.

The current draw through a relay is quite low so you may get away with switching both (or indeed all three if you retain the aux. fan) of the new fan relays to earth in parallel via C1. If there is any doubt, safer will be to use the ECM to switch a transitor or even another (low amp? - all that is required) relay that will switch the other relays (wired in parallel).

The A/C connections at the ECM are an input on B8, indicating to the ECM that the A/C temp., A/C control, interior fan and A/C pressure switches - in series - are all closed, and an output that switches the A/C compressor relay by earthing C2.

On a V8 the aux. fan is switched on with a coolant temp. of 107C and off at 101C as a compensation for extreme conditions.

V6 is on at 102C, off at 99C, normal operating temps..

There may be some variation depending on which MemCal is used but those are pretty typical.

Both the V6 and V8 fans are on with A/C input on B8 and road speed below 55km/h.

If you are using the ECM to switch a fan or fans to provide normal cooling on a V8 the switching temp. in the MemCal has to be lowered, even lower than the V6 temps. because the V8s run cooler than V6. As a good indication of 304 running temps., the switching temps. for VT 304 are in the "How To" by immortality on switching the fan manually. It would be a good idea, if you have not done so already (^...^?) to check what temp. the MemCal is switching at against those VT temps.

Cheers man ive had the memcal set at 91C low fan and 94C high fan, was done by greenfoam since he did the tune.

If i dont need 2 have the A/C fan there then i'll do away with it so there can b more airflow i guess and just let the AU themos do the work.

Ive already got 2 relays hooked up 2 the manual switch (1 4 each fan) so would i just need 2 then run my wiring from the switch 2 the A/C fan relay like u said and thats it done? Do u know if the C1 pin out is switched on by a positive feed or negative?

[kniever]

yeh greenfoam did mine too at those same temps, worked really well and always stayed at about the 1/4 mark.

i had both my relays switched by the one connection set parallel, thought i had a pic in my ride thread but its not close enough and honestly you wont need the original fan on the front of the radiator

[wrx884]

yeh greenfoam did mine too at those same temps, worked really well and always stayed at about the 1/4 mark.

i had both my relays switched by the one connection set parallel, thought i had a pic in my ride thread but its not close enough and honestly you wont need the original fan on the front of the radiator

cheers i had a closer look at the factory relay 4 the A/C fan after thats gone i might get away with using the orange with blue trace wire on the fans plug 2 switch it all on along with the relays already there.

[Cheap6]

cheers i had a closer look at the factory relay 4 the A/C fan after thats gone i might get away with using the orange with blue trace wire on the fans plug 2 switch it all on along with the relays already there.

That sounds reasonable, keeping the extra wiring under the bonnet and minimal with no possibility of overloading the transistor in the ECM.

FWIW, C1 is switched to earth in the ECM. There is an awful lot relating to the cooling fan functionality for VN-VY in that "How To" thread referred to ^...^ .

[wrx884]

That sounds reasonable, keeping the extra wiring under the bonnet and minimal with no possibility of overloading the transistor in the ECM.

FWIW, C1 is switched to earth in the ECM. There is an awful lot relating to the cooling fan functionality for VN-VY in that "How To" thread referred to ^...^ .

cheers 4 ur help got everything working perfect, even kept the manual switch so if i did ever need 2 over ride the ECU then i can, not that i would really need it now tho