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| TimmyA |
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Fan speed doesn't have any effect on AC to my knowledge... the compressor runs at engine rpm... it determines the pressure... unless this is governed by the pressure in the system by this other sensor nigel was talking about... it there is stacks of pressure maybe this triggers high speed, if there is low pressure then maybe low speed?
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| TimmyA |
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Shouldn't make it take longer to heat up though... when you termostat is closed water doesn't travel through the radiator... the thermostat is there to control temp and should heat up at the same rate regardless of thermos...
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| XHII V8S |
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No you are right - it shouldn't take longer to heat up I'm probably exaggerating that a bit....it takes probably the same to heat up whether the fans are on or not. I actually read on the tech doco's a couple of years back how to diagnose the thermos to determine if they are working properly and thats how I discovered the whole fan control thing....
If I get into my car cold with the a/c off the fans won't start. Turn the a/c onto either 1 or 2 blower speed and the thermos kick in (even though engine temp is only 30degs) and if I turn the blower speed to 3 or 4 the thermos kick in on high (even whilst engine temp is rougly 30 odd). I've also read on here somewhere that the ECU can differentiate between ac low and hi. How it does this I don't know but I'm guessing its connected to the blower somehow because when I operate the a/c as described above the thermo response is instant. The one thing that I don't understand is if I get in the car start it up and the a/c is on from the last time I drove the car and I turn it off - the fans stay on low speed even though the engine is still cold!
_________________ Pacies & single 2.5'. New manifold to come soon... |
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| TimmyA |
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that might be a feature to help cool the gas in the condensor so as to reduce the reduce the pressure further so next time the compressor starts its not starting under a massive head pressure... Only a thought... But might something along those lines...
I posted the pin out chart for the EEC-V on the first page... There is only 3 things that appear to ac conditioning... One is an input from the switch to say its on, one is the input from the pressure switch on the tx valve to say pressure is at an aceptable level to run, and one is the input from the capillary which is clipped to the evaporator inside the airbox... or at least this is my understanding anyway... I'll look into a bit more to see i'm right or wrong... not sure how your fan speed is controlling it then... anyway will do some research and post the findings up here... as now with these comments I'm as willing to know exactly what inputs the computer does see to trigger the fans... Cheers, Tim
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| XHII V8S |
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It would be interesting to find out what if anything the blower has to do with the switching of the fans. Was EECV ever fitted to any of the V8s?
_________________ Pacies & single 2.5'. New manifold to come soon... |
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| TimmyA |
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yeah... ED was EEC-IV and EF/EL were EEC-V
later model computer more features... If someone has a factory EF/EL manual they'll upload and email to me?  I doubt its fan speed related... I'd still be leaning to pressure related... Cheers, Tim
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| XFWAGON |
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Hey cheers man, that diagram is tops. Will come in handy when i pull all the wiring out to do it again, as at the moment i just have it all dodgily connected so i can run the car
With those temp sensors, do you still need the thermal switch? I was checking out some fan kits from summit racing, they look like a much easier, and better kit than the davies craig gear, and only $45 US! |
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| TimmyA |
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i don't like the idea of the davies craig one... it uses an old technology mechanical capillary line, stuck down a heater hose... I know there is a rubber seal for it, but I just think is a cheap nasty way of triggering fans...
If you use a tridon switch... one that will fit into a spare bung in your thermostat housing, or make your own bung if you can... then run the two or three wires to it, wire up the relays as I had shown you... Only thing is where I show the EEC-V switching the relays, you will have that temp switch switching the relays... As I said if you pick a switch I can rough up a diagram for you with 4 relays, which will give you two speeds (requires the temp switch with two sets of contacts at different temps for each set)... buy the switch, go to a wreckers and cut the fan relay block out of an EF so you get the 4 relays... re-wire according to my diagram I draw and hook two single speed fans to it, be it after-market or genuine EL fans and you'll get two speeds plug the ac trigger... which ever suits you better... this way or that 45US one... up to you... I'm happy to help where I can either way though... Cheers...
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| XFWAGON |
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{USERNAME} wrote: i don't like the idea of the davies craig one... it uses an old technology mechanical capillary line, stuck down a heater hose... I know there is a rubber seal for it, but I just think is a cheap nasty way of triggering fans... If you use a tridon switch... one that will fit into a spare bung in your thermostat housing, or make your own bung if you can... then run the two or three wires to it, wire up the relays as I had shown you... Only thing is where I show the EEC-V switching the relays, you will have that temp switch switching the relays... As I said if you pick a switch I can rough up a diagram for you with 4 relays, which will give you two speeds (requires the temp switch with two sets of contacts at different temps for each set)... buy the switch, go to a wreckers and cut the fan relay block out of an EF so you get the 4 relays... re-wire according to my diagram I draw and hook two single speed fans to it, be it after-market or genuine EL fans and you'll get two speeds plug the ac trigger... which ever suits you better... this way or that 45US one... up to you... I'm happy to help where I can either way though... Cheers... So the tridon switch does it all? All i need would be the tridon switch, relays and wire?? That sounds good. Personally i hate the davies craig switch, it looks ugly as hell and messy. I have EEC-IV so don't have the switching capabilty from an ECU. I have EL fans at the moment, the ones with the single block connector with two black wires and two red wires. That would be great, thanks! |
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| TimmyA |
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thats fine... because I still know the go from the factory gear yet...
if you want AC to trigger it... Do you want them on high (which will be almighty noisy) or only low when the AC is on? and if you have a look at the tridon switches tell me which one you think you'll use (on and off temps are listed as well as thread sizes) and I can draw from that... All the ugly craig davies thing is, is an old mechanical switch... its either on or off... does not offer two speeds (unless you mount two of the ugly things)... the tridon one is a nice little brass thing you screw into the thermostat housing, rather than stick down a hose... only difficulty you might have, is the switches with a fancy connector, you might need to find out what car they are made to suit (as listed on their website somewhere i think) and cut the plug off from a wreckers to plug into the switch... Cheers, Tim
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| XFWAGON |
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What sensor does the EF/L use? There are so many EF/L's and AU's at wrecking yards here, i can just go and get what i need, plus they are cheap.
Either that or i will check out where i could mount the tridon switch and figure out which one i need and do what you said. Would prob' only need the fans on low for AC? AS it never gets hot here anyway. I'll do some hunting and see what i can find out! |
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| TimmyA |
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the EF/EL do not have a switch for the thermos...
they have the one sender (not a switch but a variable sender) and it talks to the computer... when the computer senses the need for fans, be it too hot or the ac... it turns them on at whatever speed it sees fit... you need one of those tridon switches (not a sender)... its only if it has a funny connector that you need the plug off the required car... you pick a switch off their website... pick it the right temps you require the fans on at... and pick the right thread, unless you drilling a hole and tapping a thread, in case pick a thread you have a tap for... tell me... I'll have a look and see what is needed to hook onto it and wire it up... I'll get back to you and tell you what you need to source to do it... and once we agree I'll draw how to wire it... Sound like a deal? Cheers, Tim
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| XFWAGON |
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{USERNAME} wrote: the EF/EL do not have a switch for the thermos... they have the one sender (not a switch but a variable sender) and it talks to the computer... when the computer senses the need for fans, be it too hot or the ac... it turns them on at whatever speed it sees fit... you need one of those tridon switches (not a sender)... its only if it has a funny connector that you need the plug off the required car... you pick a switch off their website... pick it the right temps you require the fans on at... and pick the right thread, unless you drilling a hole and tapping a thread, in case pick a thread you have a tap for... tell me... I'll have a look and see what is needed to hook onto it and wire it up... I'll get back to you and tell you what you need to source to do it... and once we agree I'll draw how to wire it... Sound like a deal? Cheers, Tim Bloody ripper mate! I just had a look at my spare thermostat housing, found a perfect place for the switch, i have a tap and die set so i'll find out what size etc i need and will get back to you. Cheers!
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| TimmyA |
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that'll look s**t hot there...
check the website... M12 & M14 are on there... you'll need to compare a pitch and see what you can get your hands on... before I was updating to a EEC-V in the ED i was going to use the spare bung on the thermostat housing but its a rare size on their site and couldn't get the right temps for my application... so when I learnt about j3 chips I decided I'd just run a EL computer and go that way... Cheers, Tim
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| XFWAGON |
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Well, i think it will be an M16 thread, as that is about the size of the middle of the bore, i could go M18 but that would need a fair amount of meat taken out of the housing. So i've looked at these: TFS123, TFS140 (open)(looks like E/AU series plug styles), TFS197(closed)
What style of switch am i meant to be looking for, normally open, normally closed, ground etc? |
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