#1: Cooling fan resistor Author: Edward, Location: In the garagePosted: Thu Dec 02, 2010 4:00 pm ---- So does anybody know what the resisitor is for on the fan housing? It's the connector to the bottom left of the fan. Is this just used for the low speed fan?
I'm going to look at wiring my Omex ECU to the fan (or more accurately the relay) so I'm trying to understand what stuff does what...I might even re-use the original coolany fan relay if I can make sure the power supply to it is reliable.
#2: Re: Cooling fan resistor Author: Wiliam_morgan, Location: South WalesPosted: Thu Dec 02, 2010 4:05 pm ---- i take it you know what a resistor is?
i see what u mean about low speeds for the fan but my understanding is that the fan is either just on or not none of this low speed or high speed..
its more that likley that the resistor is constantley in use to stop over current i wouldnt be able to say anymore with knowin any figure as such
thats my logic anyway some one feel free to put me right if u think so!
#3: Re: Cooling fan resistor Author: MEGA, Location: Harrow, LondonPosted: Thu Dec 02, 2010 4:08 pm ---- The fan is on or off, atleast on mine.
It comes on based on a message-send from the ECU when the temp hits 95, and goes off at 90.
I know this 100% because at present the b*****d thing is loose and rattles like a mofo when it comes on. Heh.
However. Are you able to strip the wires before and after this resistor? Check input voltages at both sides. Then you can match it with your own setup. Also see what those number differences are with the fan both on and off. It might be that the fan would always be on, if not for this resistor. etc. No idea how the ECU interacts with something that only requires power to run. Would stand to reason there is a relay somewhere.
I'm waffling, so I'll shut up.
ps lol at first line of post above. Yes. Ed would know that. How rude lol.
#4: Re: Cooling fan resistor Author: Wiliam_morgan, Location: South WalesPosted: Thu Dec 02, 2010 4:14 pm ----
MEGA wrote:
The fan is on or off, atleast on mine.
It comes on based on a message-send from the ECU when the temp hits 95, and goes off at 90.
I know this 100% because at present the b*****d thing is loose and rattles like a mofo when it comes on. Heh.
However. Are you able to the wires before and after this resistor? Check input voltages at both sides. Then you can match it with your own setup. Also see what those number differences are with the fan both on and off. It might be that the fan would always be on, if not for this resistor. etc. No idea how the ECU interacts with something that only requires power to run. Would stand to reason there is a relay somewhere.
I'm waffling, so I'll shut up.
ps lol at first line of post above. Yes. Ed would know that. How rude lol.
gta ask :S, was more of a rhetorical question
haha wiggled my way out of that one
#5: Re: Cooling fan resistor Author: Edward, Location: In the garagePosted: Thu Dec 02, 2010 4:15 pm ---- I'm sure there is a low speed for when the A/C is on and a high speed for cooling the radiator when the engine is hot...
It also has two relays...one for each speed? I suspect the resistor is linked to the wiring for the low speed fan relay.
The relays will be triggered by outputs from the ECU.
#6: Re: Cooling fan resistor Author: MEGA, Location: Harrow, LondonPosted: Thu Dec 02, 2010 4:16 pm ----
Wiliam_morgan wrote:
MEGA wrote:
The fan is on or off, atleast on mine.
It comes on based on a message-send from the ECU when the temp hits 95, and goes off at 90.
I know this 100% because at present the b*****d thing is loose and rattles like a mofo when it comes on. Heh.
However. Are you able to the wires before and after this resistor? Check input voltages at both sides. Then you can match it with your own setup. Also see what those number differences are with the fan both on and off. It might be that the fan would always be on, if not for this resistor. etc. No idea how the ECU interacts with something that only requires power to run. Would stand to reason there is a relay somewhere.
I'm waffling, so I'll shut up.
ps lol at first line of post above. Yes. Ed would know that. How rude lol.
gta ask :S, was more of a rhetorical question
haha wiggled my way out of that one
How odd. When you quoted my post: The word 'strip' was removed. I tested it myself and it was fine. What you got against stripping? Hah.
#7: Re: Cooling fan resistor Author: Wiliam_morgan, Location: South WalesPosted: Thu Dec 02, 2010 4:21 pm ---- [quote="MEGA"][quote="Wiliam_morgan"]
MEGA wrote:
The fan is on or off, atleast on mine.
It comes on based on a message-send from the ECU when the temp hits 95, and goes off at 90.
I know this 100% because at present the b*****d thing is loose and rattles like a mofo when it comes on. Heh.
However. Are you able to the wires before and after this resistor? Check input voltages at both sides. Then you can match it with your own setup. Also see what those number differences are with the fan both on and off. It might be that the fan would always be on, if not for this resistor. etc. No idea how the ECU interacts with something that only requires power to run. Would stand to reason there is a relay somewhere.
I'm waffling, so I'll shut up.
ps lol at first line of post above. Yes. Ed would know that. How rude lol.
MEGA wrote:
Wiliam_morgan wrote:
MEGA wrote:
The fan is on or off, atleast on mine.
It comes on based on a message-send from the ECU when the temp hits 95, and goes off at 90.
I know this 100% because at present the b*****d thing is loose and rattles like a mofo when it comes on. Heh.
However. Are you able to the wires before and after this resistor? Check input voltages at both sides. Then you can match it with your own setup. Also see what those number differences are with the fan both on and off. It might be that the fan would always be on, if not for this resistor. etc. No idea how the ECU interacts with something that only requires power to run. Would stand to reason there is a relay somewhere.
I'm waffling, so I'll shut up.
ps lol at first line of post above. Yes. Ed would know that. How rude lol.
gta ask :S, was more of a rhetorical question
haha wiggled my way out of that one
How odd. When you quoted my post: The 'strip' was removed. I tested it myself and it was fine. What you got against stripping? Hah.
haha no idea! ohh nono nothink agaist striping quite the contrary lol!
#8: Re: Cooling fan resistor Author: Edward, Location: In the garagePosted: Fri Dec 03, 2010 6:25 am ---- You two have well and truly ruined my topic!!
#9: Re: Cooling fan resistor Author: MrBSI, Location: What's it to you? ? ?Posted: Fri Dec 03, 2010 9:57 am ---- Last edited by MrBSI on Mon Dec 17, 2012 10:07 pm; edited 1 time in total
#10: Re: Cooling fan resistor Author: Edward, Location: In the garagePosted: Fri Dec 03, 2010 11:01 am ---- Excellent.
I know I can test it but do you think the power is to the relay all the time? i.e. even with the ignition off? Does the ECU just operate the relay? If I can disconnect the original ECU from the high speed relay and simply connect the Omex in its place it would be great.
#11: Re: Cooling fan resistor Author: MrBSI, Location: What's it to you? ? ?Posted: Fri Dec 03, 2010 11:08 am ---- Last edited by MrBSI on Mon Dec 17, 2012 10:06 pm; edited 1 time in total
#12: Re: Cooling fan resistor Author: st3v3n, Location: Liverpool Drives: 206 GTiPosted: Fri Dec 03, 2010 11:20 am ---- The OMEX uses a switched negative whereas Peugeot use a switched positive for the relay. You are correct in thinking that coil by the relays is a resistor. They should have power there even with ignition off so it continues to cool once you stop. Your best bet would be to get your multimeter out and test what you have. I've removed the resistor from mine and the two under bonnet relays. Tthe omex switches the new fan relay by triggering a ground to the relay coil.
#13: Re: Cooling fan resistor Author: Edward, Location: In the garagePosted: Fri Dec 03, 2010 11:42 am ---- So I could still use the original relay but I'd need to make sure it has an ignition controlled positive so the Omex can switch the negative??
#14: Re: Cooling fan resistor Author: st3v3n, Location: Liverpool Drives: 206 GTiPosted: Fri Dec 03, 2010 11:48 am ---- No, as you would only get the fan on when BOTH ecus switch it on. You will have to do away with the standard ecu input to the relay and give it a perm +12v and switch the earth via the omex.
If you want to keep both it is also possible.
What you would need to do is fit another relay (a small one will do) and use the omex to switch that on and use it's output to power the standard relay. If that doesn't make sense I can draw it for you later.
#15: Re: Cooling fan resistor Author: macj, Location: EssexPosted: Sat Dec 04, 2010 11:32 am ---- Would it be possible then to operate the A/C fan on low speed via the standard ECU, Connect the Omex with a small relay and disconnect the main full speed fan relay from the standard ECU and use the Omex on this speed...... think thats what I was asking
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