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My ac does not make the fan run continuously. When my ac is on, the fan runs about 3 seconds, and then shuts off for about 12-15 seconds. I've had the car to Ford on four different occasions about this. The last time, they worked on it for a week, and can't find the problem. They finally told me that 'the car is supposed to do that'. The also said 'the temp gauge is supposed to run at the L in normal'. I've given up on Ford, and I'm trying to figure it out myself.
Oh, Kremit, if you remove the ac compressor, I don't think the ac switch will turn the fans on. I think you have to have pressure on the high side of the ac unit before the fans will come on. Check me out on this, as I'm only learning what I can, but I think that's the way it works. I don't think it is just an electrical connection that turns the fans on; I think they come on when the ac pressure reaches 250 or 300 pounds pressure, or somewhere around there.
Last edited by bentleywarren; 01/17/03 02:52 PM.
95 Contour Zetec, ATX (wrecked, sitting in the barn)
95 Mystique Zetec, MTX
2000 Taurus SEL 3.0L Duratec
1994 Crown Victoria LX 4.6 V8
1993 Chevy Silverado 4.3 V6
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Joined: Nov 2000
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Hard-core CEG'er
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You don't need to remove it to do this.
Just unhook the electrical connector to the clutch on the A/C compressor. That way when you turn your ac on, it'll just kick the fans on but won't engage the compressor.
This way when your ass is roasting this summer, you will be able to hook it back up if you want, instead of kick yourself in the ass cos you were stupid and took the whole thing out.
PS my chip for the turbo will kick BOTH fans on at a lower temp than stock, and it will switch off the IMRC and both lower O2 sensors. 
Last edited by Stazi the Aussie; 01/17/03 06:07 PM.
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!
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Joined: Jul 2001
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Addicted CEG\'er
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Addicted CEG\'er
Joined: Jul 2001
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Hey, Matt..
You wanna talk circuits, we both seem speak "ET" fluently.
I have a circuit that you will LOVE..
Ray
'99 CSVT - Silver #222/276
In a constant state of blow-off euphoria.
Originally posted by Kremitthefrog:
I like to wear dresses and use binoculars to watch grandmas across the street.
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Joined: May 2002
Posts: 21,653
I have no life
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I have no life
Joined: May 2002
Posts: 21,653 |
Originally posted by Stazi the Aussie:
You don't need to remove it to do this.
Just unhook the electrical connector to the clutch on the A/C compressor. That way when you turn your ac on, it'll just kick the fans on but won't engage the compressor.
This way when your ass is roasting this summer, you will be able to hook it back up if you want, instead of kick yourself in the ass cos you were stupid and took the whole thing out.
umm can i borrow $600+ to get my compressor fixed? that's why i'm removing it. Didn't have it last summer, won't have it this summer. and Ray, I wanna talk circuits,,, maybe at the se reg. meet.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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Joined: Oct 2002
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Hard-core CEG'er
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99MercMystLS25 and you have never posted in the sothern cali forum. why? I would like to put in side markers on my tour but im a little hesitant about the wiring maybee you could help. + i just bought a cap. for my car stereo and want to know why i cant run it in line instead of having to run it like the directions say(it uses twice as much wiring that way) and i already have too many wires in my trunk. Theres alot of cool guys in the sd area, me being one  and were always trying to oragize little get togethers. With your brains and our good looks  we could have a good old time
98 csvt t-red.. sho-shop intake, b&m, fidanza, spec1 clutch, Torsen, DMD,optimized Y& TB, Brullen, rear strut bar,h&r's,17" konig traffik's.
"I say what I mean and I do what i say"
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Originally posted by Kremithefrog:
my solution for real life situations:remove the a/c system (being done on my car very soon), now the a/c switch will just control the fans.
Why not just put a cockpit mounted switch in the A/C compressor clutch circuit to de-activate it from engaging while you turn on the A/C mode switch? Then you can turn the switch on and have cool air in the summertime
'95 CONTOUR SE
-Enkei 16s
-SVT wannabe
-Dual escapes w/ 2 1/2" stainless tips
-True LED taillight conversion
- Audi Xenon Projector Retrofit
-Mp3 deck, dual 10s
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Joined: Nov 2002
Posts: 146
CEG\'er
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CEG\'er
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Originally posted by midnghtflm:
Hey, Matt..
You wanna talk circuits, we both seem speak "ET" fluently.
I have a circuit that you will LOVE..
Ray
sounds great! PM me, i'm always interested in circuits.
99 Silver CSVT #1081/2760
97 Nissan Altima
83 Corolla SR5 RWD bondo/rust body 'ghetto cruiser' RIP
78 Winnebago Minnie (Dodge Chassis 23') 440cid 4bbl.
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Originally posted by ajdulina:
You don't get 24v from two 12v sorces. it still 12v, but now you have a higher amp flow.
It doesn't work that way dude. Amp flow stays the same. It's the set resistance of an accessory's load, and the running voltage, that determines the amperage (current flow). You can hook a thousand parelleled wires going from 1000 12v batteries, hooking up to one load (one fan say), and the fan will only DRAW the rated current load of the fan (if running at it's 12v rating). Amps X Volts = Watts. And Voltage = Amps X resistance (E=IxR). Example: 12v = ____amps X .8 ohms resistance, so what is the amperage of the circuit? It would be 15 amps that would flow through that circuit at 12v. Now if you start the car, and the voltage jumps to 14v (w/ alt), then it would be: 14v = 17.5 amps X .8 ohms. Do you see how that works? See more about ohms law here: http://www.eatel.net/~amptech/elecdisc/ohmslaw.htm
'95 CONTOUR SE
-Enkei 16s
-SVT wannabe
-Dual escapes w/ 2 1/2" stainless tips
-True LED taillight conversion
- Audi Xenon Projector Retrofit
-Mp3 deck, dual 10s
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Joined: Jun 2002
Posts: 652
Veteran CEG\'er
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Originally posted by bentleywarren:
Four months later:::
I found out that if I disconnect the wiring connector from the water temperature sensor, the cooling fan will run all of the time. I assume that low conductance when the plug is removed activates the fan. Here's my question. If I splice a switch into the wire going to the temperature sensor, could I turn the switch on or off, and make the fan run all of the time? Would I be messing something up electronically? I would only turn the switch off (turn the fan on) when the engine was tending to overheat.
If you disconnect the ECT sensor, it will trip a code in the ECM, and the engine will likely run lean since that sensor feeds temp data to the ECM to help determine correct air/fuel mixture compensation and ignition timing advance. When the engine is really cold, ECM supplies a very rich mixture since fuel doesn't atomize well when cold, and when ECM thinks engine is really warm, it runs a really lean mixture to the engine. You wouldn't want to disconnect that sensor while engine is running. Also because the computer MAY even (on some cars), go into limp home mode, and timing advance will set constant, air/fuel mixture will lock into a preset value, which was a mode designed to 'limp' the car to the dealer or a shop, in case a crutial ECM sensor fails while driving, so you can wherever possible, make it without breaking down.
Best way I think to turn on fans is to just tap into the stock fan relay (on the high-speed trigger), and wire an auxillary switch into the trigger wire, MAKING SURE to wire in the diode to protect the ECM from relay power-down recoil, which can cause a surge and hurt something (relay coils build up a magnetic field like an ignition coil when power is applied, then when field collapses a HV surge back feeds through the circuit). A 0.5 watt diode wired into the trigger wire feeding from the ECM should protect the circuit from this potentially dangerous powerdown spike.
Or you could just wire a completely separate fan relay parelleled directly to the fan itself, so as just to overide the whole fan circuit and make the fans have power whenever you power up the secondary relay (this will not pose any risk to the ECM, but should still have a diode on the primary trigger, since powerdown recoil can still generate sparks that can eventually in time, burn down the contacts inside the toggle switch that you use to turn on the relay.
Also if one was to wire a relay in to turn the fans BACKWARDS in direction, please note, that IF YOU MUST DO THIS, you must ALSO wire in a safety disconnect relay, that will dis-able the stock fan's relay from being able to have the potential to power up the circuit at any time that the fans are engaged backwards! If the ECM were to successfully be able to power up fan circuit while fans were going backwards, this would cause a short circuit and maybe a fire, if proper circuit protection wasn't there. Which COULD burn your car down. So by also wiring in a disable relay for the normal circuit, then you would avoid this from happening. But you would STILL have to remember to turn of the reverse rotation function while driving forward, since the fans would be trying to fight the natural airflow, which could cause an overheat condition at highway speeds and loads, and put unnecessary stress on the fan motor since it would be trying to fight natural airflow. Not good.
By the way, why would anyone deem this mod necessary in the first place?? What is hoped to be achieved? Do you feel your car runs too hot at the track in the staging lanes or something? Because Summit DOES just sell ADJUSTABLE fan turn-on thermostats that can be mounted on the radiator to control the fan. And you can just set it at whatever temp you wanted, and then the fan will continously run until the temp probe you mounted to the radiator is below the set temp setting you put the knob to. Then it would be all automatic. To me, that's the only way to fly. 'Cause when you got some hot chick in the car with you, you wanna be like holding her hand or something, NOT having to play around with a row of toggles and $hit
'95 CONTOUR SE
-Enkei 16s
-SVT wannabe
-Dual escapes w/ 2 1/2" stainless tips
-True LED taillight conversion
- Audi Xenon Projector Retrofit
-Mp3 deck, dual 10s
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Oh, another thing I just thought of:
If you were to wire the fans to turn backwards, then you'll likely strip the paint off the front bumper, since the intense hot air blowing out the front grille opening would be just like a heatgun (like the ones for stripping paint). I could be wrong, but that is what I think would happen since the bumper's paint is especially sensitive since it is only adhering to plastic?
'95 CONTOUR SE
-Enkei 16s
-SVT wannabe
-Dual escapes w/ 2 1/2" stainless tips
-True LED taillight conversion
- Audi Xenon Projector Retrofit
-Mp3 deck, dual 10s
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