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#1 |
creative mastermind
Join Date: May 2002
Location: Cary, NC
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![]() By: Dave Barton
Description: This page will outline a simple and inexpensive primary electric fan conversion for the Volvo 240 and 740. While there are many options for your Volvo when it comes to keeping cool, this one is presented at face value with no specific claims, other than my own experiences. http://www.turbobricks.com/mods.php?content=art0008 Last edited by boostdemon; 06-27-2005 at 02:42 PM.. |
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#2 |
Board Member
Join Date: Jul 2005
Location: Tacoma, WA
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![]() I am ready to do this conversion, and I think I've found a good candidate. I dont like buying used if I can help it, so I've found this.
http://cgi.ebay.com/ebaymotors/14-IN...QQcmdZViewItem I am just worried with the drain it will put on my alternator... will it be able to handle it? I am going to be running Sirius Satellite radio, and a 52x4 watt CD deck.
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My Buyer/Seller Feedback Thread
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#3 |
Board Member
Join Date: Jul 2004
Location: Australia
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![]() What alt do you have? What condition is it in? Did you ask them the current draw of that fan? what fuse is fitted to the deck? 10amp?
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#4 | |
AW71AW71AW71 AW71AW71AW71
Join Date: Dec 2006
Location: Vancouver B.C.
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![]() Quote:
Basically I wouldn't worry about it until you start getting amps. I noticed my headlights would VERY SLIGHTLY dim when the bass really hit, at idle. I got a 1 farad capacitor and it's no longer an issue. You'll be okay, as long as your battery is in decent shape. |
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#5 |
Board Member
Join Date: Jul 2005
Location: Tacoma, WA
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![]() i have the stock Volvo Turbo alternator i was having some grounding issues with it, whenever it grounded it would charge fantastically. I JUST finished the wiring harness and put on a spanking new ground wire so it should be up to the task. its a 12V fan so i would think that it takes 12 Volts. i have NO idea about the fuse, i was going to ask about that when the fan came, or search i remember someone talking about them going to best buy and buying fuses for it.
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#6 |
still trying
Join Date: May 2003
Location: Port Richey, Florida
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![]() in this article there is no mention of a electrical relay or switch to turn on the fan at a certain temperature.
These relay/fan thermastat kits can be bought for $60 at a local auto zone or Discount, these are adjustable and come with a relay and all the wiring to hook it up, however i have had an electric fan on my car since 2003 and it has failed me 3 times, 2 used GM fans and one brand new Imperial Fan and 2 relay kits have gone out on me. -one thing to note is to use a big relay, such as a 30 or 40 amp relay(at least) for your fan. these can be picked up cheap at junkyards out of volvos just remember to get the 5 pronged relays or 4 with 87A missing(this prong gets power all the time until the relay clicks) Here is a diagram of the relay of how it should all go together: ![]() Last edited by 240Psycho; 01-24-2006 at 02:48 PM.. |
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#7 |
Board Member
Join Date: Mar 2005
Location: Texas...fool.
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![]() Any thoughts on mounting an LED to this circuit? How about an LED that turns off when the fan is on. That way when you see the light on, you know that the fan is off. If the fan is off for too long you know something is wrong.
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I have enough friends already. I'm not looking to make more. Proud owner of a 68 Amazon 220. |
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#8 | |
still trying
Join Date: May 2003
Location: Port Richey, Florida
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![]() Quote:
at any rate, if you wanted to do this you would hook a wire up from the relay at terminal #87A and have it go to the LED then a ground from the LED, as soon as the thermastat closes in the radiator and makes a ground, the coil in the relay will become charged and pull the magnet over to the other poll(87) and turn the fan on. Thats a good idea you have there, maybe placing it under the temp gauge would be a good place for it. |
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#9 | |
Master Destructor
Join Date: Sep 2003
Location: San Jose, CA
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![]() If you wanted the fan to stay on regardless of whether the car is on or not could you hook the ground for the fan to the thermostat and the positive straight to the battery. Would that burn out something? What is the best way to hook the fan up for this? Also what is the best temperature thermostat to use for this? Would the stock 740 thermo that mounts in the rad be okay?
Thanks Spencer
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'85 244 DL - R.I.P '82 244 TIC - MS/13c/Crane Hi-6/Jacobs Coil/Full 3 in exh/3 Row Nissens/E-Fan '63 p1800 - Gone to a better place Quote:
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#10 | |
...
Join Date: Jul 2004
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![]() Quote:
![]() Relays are your friend... (They are there for a reason) |
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#11 |
Board Member
Join Date: Nov 2003
Location: Syracuse Ny
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![]() not to get off topic, but i wired my efan to the ac fan (has been eliminated) wires and it works great
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1987 745 Ti 1989 745 na |
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#12 | |
Revived...
Join Date: Dec 2004
Location: Palo Alto, CA
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1990 Audi Coupe quattro x3 - the eternal project car. 2000 Audi A4 Avant quattro 1.8T 5spd |
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#13 | |
still trying
Join Date: May 2003
Location: Port Richey, Florida
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![]() Quote:
I hook my relay's ground up to the t-stat in the radiator, it does indeed come on too hot, but not enough to really hurt anything, i had the fan set before to 165, the t-stat in the radiator is set to 180 i beleive. at anyrate i was driving the car around with no fan for about 4 days, so this new set up makes me feel more at peace Last edited by 240Psycho; 01-25-2006 at 10:54 PM.. |
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#14 |
...
Join Date: Jul 2004
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![]() Oh yeah, I use a Saab Relay. 50 amps. Cost about zero dollars from the junkyard.
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#15 |
Board Member
Join Date: Jan 2006
Location: Sunderland and LakeDistrict/Cumbria
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![]() The fan that is driven on a pulley on the front of the engine, is that fixed to the shaft, or does it only turn upto a certain rpm, then stay there whilst the engine continues accel?
Just it seems to be stopping any sort of top end 'go' out of my engine. Could I remove it and have a nice electric set up, to compliment my electric water pump etc that i am also fitting (more reliablity and trustworthy ness then performance orientated). |
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#16 | |
Board Member
Join Date: Jul 2003
Location: Smellingham, WA
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![]() Quote:
As of the belt driven fan, it is connected to the engine through a temperature controlled clutch. The air coming out of the radiator heats up the clutch which provides more and more traction for the fan as the temp goes up. So the theory goes. Its a very simple and reliable system. The fan clutch usually fails by keeping the fan permanently connected to the water pump at all temps which creates a fail safe mode. I converted the 240 to an electric fan it was worth it for the reduction in noise alone.
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![]() Greed is good. tits for president |
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#17 |
Exitus acta probat
Join Date: Apr 2007
Location: Wisconsin/Illinios
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#18 |
Board Member
Join Date: Jan 2007
Location: Ann Arbor, Michigan
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![]() So does it matter if the relay is high amperage? A 50 amp will work just fine compared to a 35 amp?
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#19 |
Bored Member
Join Date: Feb 2003
Location: Clarksville, TN
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![]() I was asking someone about this in another thread. Whether you remove the belt driven fan. They said yes, but that doesn't sound right. If the Electric fan is set up right, it will keep things cool and you will recieve a performance benefit? You don't need to remove it do you?
My old car, I had trouble tracking down where and why it was losing water. Turns out the fan clutch had gone out, and the electric fan was not coming on at all. It would lose water without the temp guage reading anything but straight up and down until the water level got low, then it would show hot. Seems really stupid to regulate the temp guage like that. |
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#20 |
still trying
Join Date: May 2003
Location: Port Richey, Florida
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![]() David, Pm me if you own a 240, i can help you out.
This thread is deals with the Electric fan converson on the rwd bricks. The conversion removes the noisy, heavy clutch fan, to get replaced with the electric fan that is mounted on the radiator. The fan that came stock on some cars INFRONT of the condensor is nothing more then an ac cool down fan, this fan was not intended to be used to cool the car down at idle. Also electric water pumps is a different topic, if you want, you can start an article about how to do that. Not trying to be an ass, but it would be nice if this stayed ontopic and delt with electric fans only. |
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#21 |
Bored Member
Join Date: Feb 2003
Location: Clarksville, TN
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![]() I have a 940.
There are some things I think aren't clarified about this modification. I was under the impression that the electric fan a lot of people acquired are from 940s. The link at the top of the page doesn't mention removing the fan clutch from what I could find. My question was does this conversion use this electric fan from the 940 and does the conversion remove the fan clutch. I ask because if the fan people use is the one from the 940. Then I could remove my fan clutch to get the same performance benefit. It was my understanding that the fan clutch did not engage until the engine got hot. So it may also be possible to set the electric fan to come on first for a performance benefit. So what I wanted clarified, what isn't included in the article. Is the 940 electric fan suitable. Sounds like it isn't from what you say, and does this article suggest removing the mechanical fan, or just setting up the electric one to come on first with a thermostat, etc. Thanks, feel free to delete any of my questions. Please include this info in the article? |
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#22 |
Traitor
Join Date: Aug 2004
Location: Salem MA
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![]() even tho you dont believe in using mathmatical models to get a performance edge,
hopefully this helps illustrate using a 940 fan: http://www.pbase.com/740weapon/electric_fan
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'92 944 Turbo:13.400@99.68. Sold. '90 744 16 Valve. 16.317@85.55. Sold. '92 244. Sold. http://pbase.com/740weapon |
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#23 | |
Board Member
Join Date: May 2005
Location: CT - USA
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![]() Quote:
You want the radiator fan, the one behind the radiator. Be sure to take the plastic shroud too. The relay for the fan is on passenger side, behind the headlight. Take that also, and as much length of wire as you can get that's attached to the relay. There are 2 thin ones that are grounded to 'trip' the relay. Red and green power out go to the fan. Heavy red (power in) goes to the battery. On mine, the heavy red wire had a fusible link in it, but I only found that because I traced that wire from the relay all the way to where it ended at the battery and got the whole thing. Definitely worth the effort. The relay is excellently built. Mine was from a roughly 10-year-old car, and the gasketing on the relay terminals is so good that the contacts in there are still shiny as new. That's a good thing for a fan that can draw maybe 27A. That's another reason I like having the fusible link - I didn't have to bother setting up a high-amp-rated fuse for this project.
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Above: Daily Driver '89 245 NA, 951 ECU, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors, quad HORNS!, aero mods in progress, hypermiling at ~31 mpg w/auto tranny Wifemobile '89 245 NA stock 90 244 NA spare sold to wife's daughter; she painted it Toyota blue. |
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#24 | |
Board Member
Join Date: Jul 2003
Location: Smellingham, WA
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![]() Quote:
15 months after installing the 940 fan in the 240, it finally blew the 30a fuse this past weekend. I caught it in traffic as the temp gauge (compensation board removed) spike past the half way point but long before the red. I replaced the fuse (always carry spare fuses in the glove box) and I was back in business in 3 minutes. This is the wiring diagram for the Volvo fan and relay. ![]() |
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#25 | |
Board Member
Join Date: Jan 2007
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![]() Quote:
I do not know if this thread is dead or still alive but I will take a chance and ask my question I am also thinking of biting the bullet ![]() First most imp question ![]() How to see if the junker fan is good (apart from the looks of it)? I have few questions about this diagram 1. Green from c1 - Does it power the high speed of the fan or the Red from C2 2. Since I have a 240 so signal for high speed will come from sensor mounted on rediator (This sensor came stock with Nissens ,hopefully it should work) So does the Grn/org from B1 and Yel/Brn from B2 go to this Rad mounted sensor 3. So how do we power the low speed . ? I would like to power it Via a manual switch so that I am able to increase the cooling effeciency of AC when moving at slow speed.I hope this will not cause any issues for the engine cooling as it will be controlled via the temp sensor) Will it be through this relay shown in diagram or I will need a separate relay controlled by a manual switch at dash. If I am thinking correctly then this means that one of out put from either C1 or C2 does not connect anywhere. Is that correct. Regards Gopesh |
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