FMII kit - rewiring cooling fan to thermoswitch - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools
Old 12-25-2013, 07:27 PM   #1
Newb
Thread Starter
 
Join Date: Dec 2013
Location: Greenville, SC
Posts: 38
Total Cats: 1
Default FMII kit - rewiring cooling fan to thermoswitch

Hello,

The previous owner wired the fans in parallel (yay) to a toggle switch on the dash (what?) - I'm working to revert the cooling fans to act off of the thermoswitch.

The wires which normally plug into the cooling fan still get power when I jump the GRD and TFA pins in the diagnostics box, so it appears that all I must do is rewire the fans to plug into the normal place.

Is there any particular reason to run it off of a manual switch? Is there anything I should check before rewiring it as described and starting the car again?

I'm guessing I could check the thermoswitch (pot of water) and relay (bypass thermoswitch to ground) in isolation first.

Thanks.
Wowbagger the I.P. is offline   Reply With Quote
Old 12-25-2013, 07:53 PM   #2
Free Moustache Rides
iTrader: (8)
 
matthewdesigns's Avatar
 
Join Date: Jun 2008
Location: Colorado Springs
Posts: 1,656
Total Cats: 49
Default

I just picked up another Miata project and the fans are wired the same way. The PO said they "just stopped working" and then rewired them. Seems like a massive waste of time to have done this. I suspect the thermoswitch as well.
matthewdesigns is offline   Reply With Quote
Old 12-25-2013, 10:23 PM   #3
Newb
Thread Starter
 
Join Date: Dec 2013
Location: Greenville, SC
Posts: 38
Total Cats: 1
Default

a) I checked the relay - it clicks when the thermo switch is bypassed

b) I pulled the thermo switch and tried to test it in a pot of boiling water - my mom held it with some tongs while I used a multimeter to test for continuity, and it was dead. It's supposed to close at 207 deg F, but it wasn't doing anything in boiling water.

I can get a new switch for $15 at RockAuto or $50+ from the Mazda dealer. What's the catch? Some say that the auto parts store variety don't close the circuit at a low enough temp, some say they work fine.
Wowbagger the I.P. is offline   Reply With Quote
Old 12-25-2013, 11:45 PM   #4
Moderator
iTrader: (11)
 
sixshooter's Avatar
 
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 15,669
Total Cats: 1,561
Default

I've never had a problem with Rockauto.
sixshooter is online now   Reply With Quote
Old 12-26-2013, 10:46 AM   #5
Elite Member
iTrader: (3)
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 6,009
Total Cats: 583
Default

+1 on Rockauto.

I suspect different dealers mark-up differently. If I need something OEM, I usually go to Rosenthal or Jim Ellis on the interweb. They're pretty reasonable. BTW, virtually EVERY part on your car is still available from Mazda. Another reason to love Miatas.
hornetball is offline   Reply With Quote
Old 12-26-2013, 10:37 PM   #6
Newb
Thread Starter
 
Join Date: Dec 2013
Location: Greenville, SC
Posts: 38
Total Cats: 1
Default

I ended up paying twice as much ($30) at a local Autozone because I'm impatient and wanted to be able to return it easily in case of a malfunctioning unit. Throw in a lifetime warranty and the fact it's not made in China and I'm pleased.

I wired the fans in parallel to the original cooling fan connector and wrapped up the whole deal in plastic sheathing. Now I have clean, solid, and protected wiring . . . for the fan. There are many more messes to sort out.

Fun fact: The PO ran one wire from the fans to the switch under the dash and another all the way to the battery. The only reason I can see to do that is that he didn't want to replace (or didn't know to replace) the thermo switch.

Attached Images
File Type: jpg 2hxy7w2.jpg (185.9 KB, 88 views)
Wowbagger the I.P. is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 03:29 PM.