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All you need to do is wire the trinary switch output to the fan relay(s) for full speed. Relay controls operation of radiator cooling fans. Check the relay for the fans: (MOST LIKELY FAILURE AND MOST DIFFICULT) If the Radiator fan control module has failed you will need to replace it with a new one there is no way to repair it. I don't have the schematic for the SPAL controller, but it may have been posted here previously. Get the 10 gauge wire and place it through the hole in your fire wall. Go back under the hood and reconnect the red 12V cable to the battery. W220 Cooling Fan Controller is Hard Wired to Permanent + and - It receives a PWM Signal from ME ECU and as the Pulse Width varies based upon Engine Temp Data so the Fan Speed varies. Need to find a DIY written somewhere. Release the fan motor from the radiator by removing the four nuts securing the fan shroud to the mounting brackets riveted to the radiator frame. Withdraw the fan harness through the mounting panel grommet. The radiator is removed with the fans still attached. both fans have their wires cut and ready to be pulled. Bypassing the radiator fan switch. 55 5. I've got the thermo fans running from the stock EA radiator … Radiator; Fans; There are passive systems that don’t have fans, but they are pretty uncommon. Jun 3, 2006 #1. Honestly, if there's a power supply in your computer giving 12V, just wire it up to that. I would first find out why the aux fan did not come on. Step 2: Wiring. Cut a wire, strip the insulation from both the ends and attach to the fan controller. Thermostatically controlled motors do not work the fan until the engine coolant rises above normal operating temperature, and then switch off when it has cooled down again. I do not want my fans on all the time per the diagram you posted. Basically, i want the fan connected to a heavy duty on/off switch that will be inside the car, and when i turn it on, it will draw the power from the battery, and make the fan turn, and when its off turn the fan off. Wire both BLACK wires FROM the fan to the single BLUE W/ Green Stripe wire on the harness side. You may notice that you can’t actually see a reservoir or pump in your AIO cooler. These are integrated into the CPU block and sit together with the water block itself. Quickest test would be to unplug the radiator fan, run 1 wire each from the pos. The other end of the wire that was fitted to the in-line fuse needs to be fitted with a female spade terminal. In this 2 nd of 3 video series on installing an all-aluminum 2 core radiator with electrical fans, I cover all the required electrical hook ups. So I figured if I wire two 120mm fans in parallel but the problem is that the solar panel doesn't even spin the fans. ... (located in front of the engine radiator) as high-pressure gas. In 99% of all cases, these parts are all in the water cooling system. It has an adjustable controller, relay, inline fuse, and thermoswitch that screws into the radiator. Cross flow radiators are the more efficient of the two, but there are still die-hard fans of the down flow radiator. This will be the wire that connects your switch to your fan power wire. Fantastic. At this point, the radiator is in the car, and the required electronics are hooked up. Relay for wiring electric fans to radiator. This can easily be achieved by running a wire from the “start” terminal of the ignition to a normally open relay. This How-To will cover Option A.-Test fit the radiator again with the fans attached. Otherwise, the black/yellow wire near the leading ignition coil is another good choice. How can i wire a cooling fan directly to a switch on my car? This is part 3 (of 3) of my video series on installing a Griffin Radiator and Spal Electric Fans. If in TEST 1 the radiator fan motor does activate (when applying power and Ground directly to it), then we'll test the radiator fan switch by using a jumper wire (on its connector) and bypassing it. I would like to use the factory harnesses I snipped off my stock fans to hard wire to the Mishimoto fans so they are plug & play with the factory wiring. Engine coolant temperature sensor is located on or near the thermostat housing and contains a Black/Light Blue wire and a Tan/Black wire in the connector. curious how hard it is to remove the fans themselves, if i have to remove the bumper and all that jazz. What this does is bypasses the resistor that was there on the large fan (this is step 3). Pitman99505 Proven Member. Now take the power wire from your fan and connect it to the wire … OH WELL, I have a new one. Option B; Wire fans directly to the battery for constant power. Connect in-line fuse to the positive battery terminal. 2) Those fans do look really cheesy. 9. Maybe somebody could post it or a link. Just after the car is turned off, the acc is at +12 and the signal wire is 5Hz with duty cycle of 11%. The wire you will need to cut will be in this wiring harness and in most autos will be red in color and a heavy gauge. New fans, new J293 fan control module. The fans actually have a shroud already, which is designed to complement the compact style fan. Access to AC wire is easy with wheel and wheel well off. This means that the fans operate on a thermostatic control we earlier placed in the radiator. If the resistance is greater than 1 ohm, repair the wire harness as necessary. fan is NG. Therefore we wanted the fans to stop when the engine is cranking. Its meant to be a compact design. See Contact Test in Step 1. I checked the J293 connector outputs. I've got an '88 L series with an EJ22 installed. If so, a replacement fan costs upwards of $45. It's okay to buy a power supply that can source up to 12 amps at 12VDC. I believe the brand is Imperial. TEST 2: Bypassing The Radiator Fan Motor Switch. Here is how to test if the fan is functioning properly: Unplug the radiator fan connector. So now we have a wire that goes through the engine bay to the cabin of your car! Here the fan tray can be seen attached to the underside of the radiator. ... or turn off the fan's circuit breaker if the fan motor hard … fan to a plug connector, disconnect it, and connect it directly to 12 volt supply (use wire leads directly to battery) to see if the fan runs....if the fan doesnt run, its NG. To replace the module, & neg. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. I should have tested the fans themselves, replaced them if they didnt power on, then replaced the FCM if need be. I'll bet the bearings and motors are cheap, too. A very likely reason is that the aux. Relay is a solid state relay. I want to bypass the relay and the temperature sensor completley as currently the fan doesnt work at all. I'm after the wire or a "how to" wire up the thermo fans to the ECU of the EJ engine. AC on + coolant temp 221*F or less = both fans should run on LOW. Hi, I have a 95 Pontiac Grand Prix with a 3100 V6. This whole process is not hard, but I will say, it requires patience. If only one is running with AC on, you DO have a problem and a reason to start diagnosing. If your car is a 1st gen RX-7 you will find that the black/white wire around the ignition area to be a good source of a switched 12V signal. 3) It's very possible that you have a clog in the radiator or block, or a failing water pump, or loose belt. The armature pivots on one wire terminal, and the other wire terminal connects to the contact. Step 3 – Test the radiator fan. Flat blades that handle air poorly. The fans will come on when the factory ECU tells it to in this config. When the toggle switch flips on, the armature closes against the contact, which completes the electric circuit and turns on the fan. The radiator for our LS conversion is of the cross-flow variety, with water flowing from the driver’s side tank to the passenger’s side. Wire the two wires from the harness side, BLUE W/ YELLOW Stripe & BLACK wires together. 26 – sensor harness = 0. Pick a power supply that can source an amp or two, and that'd be more than enough. Option C; Wire the fans to a switch to manually control them. We also wanted the fans to not run when the key is in the “off” position. I would not bypass the temp. Any help? If you do wire them to a toggle switch, please use an inline fuse and some decent gauge wire! Want I need to know is how can I tap the fan relays so the fan comes on when I start the car, I'm in Texas so the fan running all the time the car is will not be a bad thing. As is, that's overdesigning. At half an amp per fan, you could hook up 24 fans in parallel! Certain aftermarket fans (eg Davies Craig) are specifically designed to be attached as close to possible to the radiator face and work most efficiently in that position. Step 1 - Wiring The first step in adding a switch to a radiator fan is to disconnect the battery's negative terminal. My fans are coming on and working fine while the car is running. At this time you may want to get an idea of where you will be placing the Denso module. Prior to buying a custom wire harness or doing PCM calibration work, determine if the vehicle will have air conditioning, if electric fan(s) are required when the A/C compressor is on, and if the PCM will be used to control the electric fan(s). This will eliminate the risk of the fan unexpectantly starting when working on the car. Radiator Fan hard wire Posted by Pitman99505, Jun 3, 2006. Pitman99505 likes … Run jumper wires between the connector's two electrical terminals. Many people like to be able to run their radiator fans all the time while at the track or drag strip. I have yellow, green, blue & grey. Placement should be a maximum of 10 inches from the radiator. The problem is, 15 minutes after the car is shut off, the fans come on full blast and drain the battery. It shouldn't be too hard to determine where to connect the trinary wire. What about a stock 4 wire set up? Now connect the wire coming in from the engine bay to the + connection on your switch and connect the wire with the resistor on it to the - and load connections on the switch. Fortunately this is a lot easier than it might seem and can be accomplished very inexpensively and doesn’t require running wiring to the engine compartment or connecting new circuits to the battery. sensor. Step 3: Terminals Power for high current devices like fans should be taken directly from the battery. battery terminal, and touch one to each terminal on the fan plug (DO NOT touch them together). Radiator Fan Control Relay Radiator fan control relay may be referred to as radiator fan control module. My factory fan pulls 4.5A steady-state, 13A spike at turn-on, and almost certainly flows better than that. I completely ditched the OEM fan electrical system and wired an adjustable fan controller from Adv auto. The radiator fan itself may be faulty. We upgrade the cooling system in our big-block–powered 1967 Camaro using a Frostbite aluminum radiator, dual SPAL electric fans, and a Weiand water pump. and leave the fans on. Follow the wire from the aux. So when the turbo timer shuts the car off the fan turns off also, or I can just turn the key to ign. 43 – sensor harness = 0. Attach that wire to the grounding point you found in step 27. 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