the trick FM uses on the hydra is to wire it to three ECU pins. Fan A, Fan B, A/C. There's a diode from Fan B to A/C to prevent the fan from engaging A/C the A/C clutch but you get the ability to run two-stage fans or have the fan come on with the A/C.
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2 stage fan mod
Goal: Have first fan stage circuit excite at 175 F. Have second stage fan circuit excite at 206 F. Do not interfere with A/C control over pass side fan.
Result: engine temp < 175 F = No fan engine temp > 175 F & < 206 F = Single stage fan engine temp > 206 = 2 stage fan (both fans running) A/C on = A/C fan on, regardless of engine temp Required items: SPDT relay, primary wire, crimp connectors, electrical tape, 30A fusible link Instructions: The relay has 5 positions, wire as follows Pin 30 to A/C side fan black/blue stripe wire FAN SIDE OF WIRE Pin 85 to thermosensor Pin 86 to +12V Pin 87 NO to +12V (high power) Pin 87a NC to A/C side fan black/blue wire on the CAR SIDE OF WIRE You need a real automotive SPDT relay with a true NO contact and a true NC contact. The el cheapo $1.49 relays probably won't cut it. It should run $7-10. You can grab +12V at the underhood fuse box. There are a variety of places. I had an unused position, so I crimped a spade connector onto a 14ga wire, and inserted it into the bottom side of the unused positon. Then reinstall the fuse block and insert a 30A fusible link. *(I ran this wire to both pin 87 (high power input) and pin 86 (switched 12V) so that my relay had power full time. If you wanted the relay to only work key on, you would need to run a switched on +12V source to pin 86.) The A/C side fan has 2 wires. Leave the black wire alone. Cut the black/blue stripe wire. The side of the wire that goes to the fan connects to pin 30 on the relay. The side of the black/blue wire that comes from the car goes to pin 87a on the relay. The thermosensor on top of the thermostat housing has only one wire. Cut it and bring it to pin 85 on the relay. Tape everything up and make sure all your wiring is secured. Enjoy |
My temps generally dont hit 190 but i like this mod. i might try something similiar
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Originally Posted by magnamx-5
(Post 119711)
My temps generally dont hit 190 but i like this mod. i might try something similiar
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Originally Posted by Ben
(Post 119714)
You have a problem if your CLT never gets to 190.
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Problem with fan mod addressed. Mod is successful.
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Where do you change the fan turn on temp in MegaTune?
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Under 'More Settings' > 'Outputs'
You'll see the lower output, #2, is set to activate on CLT, and the default temp is 215. Note that it actually activates 40 degrees under whatever this is set to, notice the note on that screen (F+40). So this is really activating the fan at 175 degreesF. You could raise it a bit if you wanted, I believe stock doesn't activate until 197*F, but I wanted to have it default a bit lower. |
Originally Posted by FoundSoul
(Post 157304)
I believe stock doesn't activate until 197*F
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We need a commons MSPNP mod faq/thread
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we have the beginnings of one already stickied in the ms section. just add to it.
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