URGENT - Need to bypass thermoswitch with MSPNP - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-11-2009, 06:27 PM   #1
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Default URGENT - Need to bypass thermoswitch with MSPNP

I am at Willow Springs and my fans are not working. The car boiled over after my last session. I need to know if there is a way to get the fan to come on in the MS software, or if there is a way to do it in the harness. I believe I have melted the wire going to the thermoswitch on the back of the head, and I cannot reach it because the manifold/turbo/DP/heater lines are in the way.
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Old 01-11-2009, 06:33 PM   #2
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Run a ground straight to the fan plug.
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Old 01-11-2009, 06:42 PM   #3
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Take the wire off the thermoswitch and ground it. Fans will run all the time when the key is on.
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Old 01-11-2009, 06:45 PM   #4
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You can ground the black / green wire at 1L to turn on the primary fan relay, the the blue / white wire at 2S to turn on the secondary fan relay.

You can pull the relay out of the socket and insert a jumper to bypass it:



(If you can't see that attachment, I'm pretty sure it's the two terminals spaced furthest apart, and which are in a straight line with one another)

Last edited by Joe Perez; 01-11-2009 at 07:19 PM. Reason: Fixed image
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Old 01-11-2009, 07:07 PM   #5
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Unplug the fan relay and jumper the terminals with a paper clip or wire with spades.

The thermoswitch doesn't run the cooling fans with the MS unless you've done some modifications for it to do so. I had MS controlling the main fan and the thermoswitch on the a/c fan, but again that was a modification done by me and not stock.
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Old 01-11-2009, 08:12 PM   #6
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Diagnostics box: GND and TFA
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Old 01-11-2009, 10:02 PM   #7
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Braineack is the winner.
(I never even noticed that terminal was there.)
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Old 01-11-2009, 11:34 PM   #8
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any update? Lots of fan problems recently.
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Old 01-12-2009, 02:55 AM   #9
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I couldn't get back to check this thread, but I really appreciate all the replies, guys. I checked my FSM first thing, and jumped GND and TFA, and nothing came on. I then drove down to Autozone (big radiator + extra hole in bumper = 200 degrees with no fans on the highway) and bought some wire and spade connectors. I grabbed 12v from the diagnostic port, grounded to the a bunch of various stuff, and the fan never came on. Looks like the motor itself died.

I'll probably do low-pro fans with a custom shroud or something.
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Old 01-12-2009, 12:52 PM   #10
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Quote:
Originally Posted by Savington View Post
(big radiator + extra hole in bumper = 200 degrees with no fans on the highway)
I just have to ask- is there something wrong with that? Mine typically indicates 196-199 on the freeway (with a 185 rated thermostat) which is just about right. Are you expecting to run significantly colder than that?
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Old 01-12-2009, 02:15 PM   #11
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Joe, I was expecting to run hotter. I always thought the fans were necessary to keep the temps where they were.
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Old 01-12-2009, 02:30 PM   #12
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Quote:
Originally Posted by Savington View Post
I couldn't get back to check this thread, but I really appreciate all the replies, guys. I checked my FSM first thing, and jumped GND and TFA, and nothing came on. I then drove down to Autozone (big radiator + extra hole in bumper = 200 degrees with no fans on the highway) and bought some wire and spade connectors. I grabbed 12v from the diagnostic port, grounded to the a bunch of various stuff, and the fan never came on. Looks like the motor itself died.

I'll probably do low-pro fans with a custom shroud or something.
If you do, be clever how you build the shroud. Many here have "upgraded" to slim fans and no shroud/custom shroud and immediately had overheating problems. Seeing how you track the car a lot, I would definitely do my research on the matter.

Personally, I bought a set of 12" slim fans to put on mine. After all my research on fans, shroud, and whatnot, I found the best solution for me: stock fans w/built in shroud.
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Old 01-13-2009, 07:59 PM   #13
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I will probably mimick the shroud setup that FCM sold for a little while. Just a sheet of ABS sealed to the radiator with two holes cut JUST big enough for the fans themselves.
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