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. 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. This will be the wire that connects your switch to your fan power wire. 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. I'm after the wire or a "how to" wire up the thermo fans to the ECU of the EJ engine. To replace the module, Just after the car is turned off, the acc is at +12 and the signal wire is 5Hz with duty cycle of 11%. 3) It's very possible that you have a clog in the radiator or block, or a failing water pump, or loose belt. The problem is, 15 minutes after the car is shut off, the fans come on full blast and drain the battery. See Contact Test in Step 1. I completely ditched the OEM fan electrical system and wired an adjustable fan controller from Adv auto. It has an adjustable controller, relay, inline fuse, and thermoswitch that screws into the radiator. The fans actually have a shroud already, which is designed to complement the compact style fan. A very likely reason is that the aux. AC on + coolant temp 221*F or less = both fans should run on LOW. This is part 3 (of 3) of my video series on installing a Griffin Radiator and Spal Electric Fans. 43 – sensor harness = 0. All you need to do is wire the trinary switch output to the fan relay(s) for full speed. Follow the wire from the aux. ... (located in front of the engine radiator) as high-pressure gas. 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. battery terminal, and touch one to each terminal on the fan plug (DO NOT touch them together). Cross flow radiators are the more efficient of the two, but there are still die-hard fans of the down flow radiator. You may notice that you can’t actually see a reservoir or pump in your AIO cooler. This can easily be achieved by running a wire from the “start” terminal of the ignition to a normally open relay. The fans will come on when the factory ECU tells it to in this config. Pick a power supply that can source an amp or two, and that'd be more than enough. Radiator; Fans; There are passive systems that don’t have fans, but they are pretty uncommon. Go back under the hood and reconnect the red 12V cable to the battery. 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. Run jumper wires between the connector's two electrical terminals. Maybe somebody could post it or a link. If only one is running with AC on, you DO have a problem and a reason to start diagnosing. Many people like to be able to run their radiator fans all the time while at the track or drag strip. 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. We also wanted the fans to not run when the key is in the “off” position. 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. I'll bet the bearings and motors are cheap, too. 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. Radiator Fan hard wire Posted by Pitman99505, Jun 3, 2006. Jun 3, 2006 #1. I don't have the schematic for the SPAL controller, but it may have been posted here previously. Radiator Fan Control Relay Radiator fan control relay may be referred to as radiator fan control module. ... or turn off the fan's circuit breaker if the fan motor hard … fan is NG. I believe the brand is Imperial. I've got an '88 L series with an EJ22 installed. Any help? Connect in-line fuse to the positive battery terminal. 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. 9. 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. If the resistance is greater than 1 ohm, repair the wire harness as necessary. I do not want my fans on all the time per the diagram you posted. TEST 2: Bypassing The Radiator Fan Motor Switch. 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