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. 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. If only one is running with AC on, you DO have a problem and a reason to start diagnosing. Here the fan tray can be seen attached to the underside of the radiator. 26 – sensor harness = 0. both fans have their wires cut and ready to be pulled. OH WELL, I have a new one. Relay controls operation of radiator cooling fans. Cut a wire, strip the insulation from both the ends and attach to the fan controller. 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. I don't have the schematic for the SPAL controller, but it may have been posted here previously. 43 – sensor harness = 0. Get the 10 gauge wire and place it through the hole in your fire wall. Radiator Fan hard wire Posted by Pitman99505, Jun 3, 2006. TEST 2: Bypassing The Radiator Fan Motor Switch. New fans, new J293 fan control module. 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. sensor. Wire the two wires from the harness side, BLUE W/ YELLOW Stripe & BLACK wires together. This will be the wire that connects your switch to your fan power wire. Go back under the hood and reconnect the red 12V cable to the battery. AC on + coolant temp 221*F or less = both fans should run on LOW. Many people like to be able to run their radiator fans all the time while at the track or drag strip. Placement should be a maximum of 10 inches from the radiator. The other end of the wire that was fitted to the in-line fuse needs to be fitted with a female spade terminal. It shouldn't be too hard to determine where to connect the trinary wire. My factory fan pulls 4.5A steady-state, 13A spike at turn-on, and almost certainly flows better than that. The armature pivots on one wire terminal, and the other wire terminal connects to the contact. Step 3 – Test the radiator fan. What about a stock 4 wire set up? This whole process is not hard, but I will say, it requires patience. This means that the fans operate on a thermostatic control we earlier placed in the radiator. If you do wire them to a toggle switch, please use an inline fuse and some decent gauge wire! I checked the J293 connector outputs. 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. Radiator Fan Control Relay Radiator fan control relay may be referred to as radiator fan control 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). So now we have a wire that goes through the engine bay to the cabin of your car! I do not want my fans on all the time per the diagram you posted. Follow the wire from the aux. Maybe somebody could post it or a link. Pick a power supply that can source an amp or two, and that'd be more than enough. 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. Withdraw the fan harness through the mounting panel grommet. I'm after the wire or a "how to" wire up the thermo fans to the ECU of the EJ engine. Option C; Wire the fans to a switch to manually control them. 2) Those fans do look really cheesy. If the resistance is greater than 1 ohm, repair the wire harness as necessary. 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. 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. All you need to do is wire the trinary switch output to the fan relay(s) for full speed. Step 3: Terminals Now take the power wire from your fan and connect it to the wire … The problem is, 15 minutes after the car is shut off, the fans come on full blast and drain the battery. So when the turbo timer shuts the car off the fan turns off also, or I can just turn the key to ign. Step 1 - Wiring The first step in adding a switch to a radiator fan is to disconnect the battery's negative terminal. The fans will come on when the factory ECU tells it to in this config. Pitman99505 Proven Member. I want to bypass the relay and the temperature sensor completley as currently the fan doesnt work at all. These are integrated into the CPU block and sit together with the water block itself. Run jumper wires between the connector's two electrical terminals. Therefore we wanted the fans to stop when the engine is cranking. I would first find out why the aux fan did not come on. We also wanted the fans to not run when the key is in the “off” position. Flat blades that handle air poorly. See Contact Test in Step 1. I don't think it comes on now because the car seems to get pretty high on the temp gauge, but it doesn't over heat (in traffic temp is about 235-240 or so). Here is how to test if the fan is functioning properly: Unplug the radiator fan connector. 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. Bypassing the radiator fan switch. ... or turn off the fan's circuit breaker if the fan motor hard … At this point, the radiator is in the car, and the required electronics are hooked up. If so, a replacement fan costs upwards of $45. Its meant to be a compact design. 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. Quickest test would be to unplug the radiator fan, run 1 wire each from the pos. 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. My fans are coming on and working fine while the car is running. Relay for wiring electric fans to radiator. Jun 3, 2006 #1. 3) It's very possible that you have a clog in the radiator or block, or a failing water pump, or loose belt. A very likely reason is that the aux. 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. How can i wire a cooling fan directly to a switch on my car? 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. Power for high current devices like fans should be taken directly from the battery. The radiator fan itself may be faulty. ... (located in front of the engine radiator) as high-pressure gas. This How-To will cover Option A.-Test fit the radiator again with the fans attached. At this time you may want to get an idea of where you will be placing the Denso module. This will eliminate the risk of the fan unexpectantly starting when working on the car. 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. Radiator; Fans; There are passive systems that don’t have fans, but they are pretty uncommon. What this does is bypasses the resistor that was there on the large fan (this is step 3). To replace the module, 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. and leave the fans on. Need to find a DIY written somewhere. battery terminal, and touch one to each terminal on the fan plug (DO NOT touch them together). Pitman99505 likes … I've got an '88 L series with an EJ22 installed. 9. This can easily be achieved by running a wire from the “start” terminal of the ignition to a normally open relay. Wire both BLACK wires FROM the fan to the single BLUE W/ Green Stripe wire on the harness side. fan is NG. Attach that wire to the grounding point you found in step 27. I've got the thermo fans running from the stock EA radiator … When the toggle switch flips on, the armature closes against the contact, which completes the electric circuit and turns on the fan. 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. I have yellow, green, blue & grey. Fantastic. Cross flow radiators are the more efficient of the two, but there are still die-hard fans of the down flow radiator. At half an amp per fan, you could hook up 24 fans in parallel! It has an adjustable controller, relay, inline fuse, and thermoswitch that screws into the radiator. I completely ditched the OEM fan electrical system and wired an adjustable fan controller from Adv auto. I believe the brand is Imperial. Electric radiator-fan motors are switched on either by the ignition switch - and run while the engine is working - or by a thermostatic switch. Honestly, if there's a power supply in your computer giving 12V, just wire it up to that. Connect in-line fuse to the positive battery terminal. 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. Step 2: Wiring. Any help? The radiator is removed with the fans still attached. I would not bypass the temp. In 99% of all cases, these parts are all in the water cooling system. Access to AC wire is easy with wheel and wheel well off. Hi, I have a 95 Pontiac Grand Prix with a 3100 V6. Option B; Wire fans directly to the battery for constant power. & neg. Relay is a solid state relay. Just after the car is turned off, the acc is at +12 and the signal wire is 5Hz with duty cycle of 11%. 55 5. This is part 3 (of 3) of my video series on installing a Griffin Radiator and Spal Electric Fans. 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. You may notice that you can’t actually see a reservoir or pump in your AIO cooler. Otherwise, the black/yellow wire near the leading ignition coil is another good choice. It's okay to buy a power supply that can source up to 12 amps at 12VDC. 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. curious how hard it is to remove the fans themselves, if i have to remove the bumper and all that jazz. As is, that's overdesigning. I'll bet the bearings and motors are cheap, too. 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