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My 8 overheated, what do I do

Old 07-01-2017, 04:40 PM
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Only tester you need is a stout piece of wire.

There are three relays marked 'fan' in the front fuse box, #1 is for the smaller fan (if I remember right) #3 is for the larger. Ignore #2, it just does some fancy bridging to run both on 'slow'.

Pull the relay and you'll see four sockets, two small and two larger. With the ignition on, but engine not running, bridge the larger two with your wire - that fan should run. No run, you'll need to check if the motor is jammed (that's common) or you need a new motor.

When you push the airbox down into it's rubber grommets, they can be popped through, right down into the fan blades below, jamming and burning out the motor. Been there, T-shirt acquired.
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Old 07-02-2017, 02:05 PM
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Originally Posted by StealthTL View Post
Only tester you need is a stout piece of wire.

There are three relays marked 'fan' in the front fuse box, #1 is for the smaller fan (if I remember right) #3 is for the larger. Ignore #2, it just does some fancy bridging to run both on 'slow'.

Pull the relay and you'll see four sockets, two small and two larger. With the ignition on, but engine not running, bridge the larger two with your wire - that fan should run. No run, you'll need to check if the motor is jammed (that's common) or you need a new motor.

When you push the airbox down into it's rubber grommets, they can be popped through, right down into the fan blades below, jamming and burning out the motor. Been there, T-shirt acquired.
hey thanks ok so not sure if I'm testing the relays right but I do know that it's the fan under the battery do you know which fan relay that is?
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Old 07-02-2017, 02:32 PM
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The one that rotates the fan under the battery when bypassed....that one.
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Old 07-02-2017, 06:52 PM
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for US S1 RX8s Fan #1 is on the RH/passenger side and Fan #2 is on the LH/driver side




Original S1 Fan Control - May have been modified later by Mazda




Original S1 Fan Wiring






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Last edited by TeamRX8; 07-02-2017 at 06:55 PM.
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Old 07-02-2017, 08:17 PM
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My point was that if he bypassed relays #1 & #3 he would KNOW which fan works or doesn't - problem solved, no?
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Old 07-03-2017, 10:05 AM
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My point was to help him with the actual diagrams that allow him to figure that out, yes?
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Old 11-19-2017, 02:23 AM
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passenger fans go out ask rotary performance i dont work there
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Old 02-03-2018, 10:10 AM
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Hello my rx8 cooling fans are not turning on both of them are not turning on. I have tested them out of the car and they both work but they do not turn on when put back in the car I thought it was the coolant temp sensor and I tested it via paper clip and it still did not work I do not know what is wrong please help
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Old 02-03-2018, 01:17 PM
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Originally Posted by hoopes123 View Post
Hello my rx8 cooling fans are not turning on both of them are not turning on. I have tested them out of the car and they both work but they do not turn on when put back in the car I thought it was the coolant temp sensor and I tested it via paper clip and it still did not work I do not know what is wrong please help

There aren't too many options: fuse, fan relay, motors, sensor. You proved the motors work, so check all the fuses and relay next. My bet is the relay.
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Old 08-05-2018, 11:09 PM
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When my car is running for awhile it starts to smoke from the coolant reservoir area and idk what the problem is i was thinking it could be the water pump or thermostat went bad!
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Old 08-06-2018, 01:35 AM
  #36  
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Could be the fans, could be the thermostat, but the damage is done, your side O-rings are melted.
Rebuild time before you do any more damage. After the engine shuts off, the coolant will enter
the chambers, and mix with the oil....run it much longer and you will miss the rebuild window and
need a new short block.
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Old 08-06-2018, 05:31 AM
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how can you be sure thatís the problem??
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Old 08-06-2018, 07:14 AM
  #38  
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Originally Posted by Pr0metheus
When my car is running for awhile it starts to smoke from the coolant reservoir area and idk what the problem is i was thinking it could be the water pump or thermostat went bad!
How high does the temperature needle go?
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Old 08-06-2018, 05:46 PM
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Originally Posted by Nisaja View Post
How high does the temperature needle go?
it doesnít move it stays in the middle!
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Old 07-10-2019, 05:34 PM
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Is it possible to set the temperature when the fans will come on?
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Old 07-10-2019, 05:38 PM
  #41  
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Originally Posted by wkrenegade49 View Post
Is it possible to set the temperature when the fans will come on?
yes you can do it with a tuner (cobb, mazda edit, adptronic) or i believe they make a much cheaper option. you need to figure why its overheating tho and not drive it till you do
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Old 07-10-2019, 06:46 PM
  #42  
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Not adjustable, but set to a more suitable temperature

https://www.rx8performance.com/produ...an-control-kit
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