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R32 - Have Your Overheat Fan Turn On With Your A/c

Cubes

By Cubes,
in Tutorials / DIY / FAQ

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Dose Pipe Sutututu
Dose Pipe Sutututu

You're incorrect   Please do not talk in F, it's a JDM and we are Australian.  We don't want another Mars Climate Orbiter disaster. 

Dose Pipe Sutututu
Dose Pipe Sutututu

You Muricannnnnnnnnnssss are hilarious. 

GTSBoy
GTSBoy

And this is why cars burn down.

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Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
On 20/10/2022 at 12:03 PM, "G" said:

I meant I want it to work with the thermoswitch as the activator. So i don't have to push any buttons.

replace the existing thermoswitch with a lower temperature one?

That fan has nothing to do with the A/C, it's an overheat fan. Constantly referred to as the A/C Fan, A/C Condenser fan, etc.. when it's actually not.

It can be dual purposed to be one (like most have).

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
2 minutes ago, "G" said:

I'm pretty sure it won't activate if the ac is not on. Even if the thermo switch reaches 194 degrees.

You're incorrect :) 

Please do not talk in F, it's a JDM and we are Australian. 

We don't want another Mars Climate Orbiter disaster. 

  • Haha 2
Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
8 minutes ago, "G" said:

Nope, it won't activate alone. 

If so, someone has cocked about with your wiring.

The above diagram is from a Nissan Manual, you're telling me they decided to print the wrong information and wire it differently? 

  • Like 1
"G" Contributor

"G"

Posted
Posted
27 minutes ago, Dose Pipe Sutututu said:

If so, someone has cocked about with your wiring.

The above diagram is from a Nissan Manual, you're telling me they decided to print the wrong information and wire it differently? 

I deleted my air con, everything under the hood. Now it won't activate at all. I want to create a stand alone circuit that activates the fan at 194d. 

Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted
Just now, "G" said:

I deleted my air con, everything under the hood. Now it won't activate at all. I want to create a stand alone circuit that activates the fan at 194d. 

it has nothing to do with the A/C, the overheat fan is on its own circuit.

  • Like 1
BK Grand Master

BK

Posted
Posted
36 minutes ago, "G" said:

Nope, it won't activate alone. 

 

Just now, Dose Pipe Sutututu said:

it has nothing to do with the A/C, the overheat fan is on its own circuit.

Then as Dose Pipe said your wiring has been stuffed with unless your ECU is not factory, as the fan has its own individual relay.

On the factory ECU the fan relay pin is always grounded, so if you bridge / bypass the radiator thermo switch you energise the thermo fan relay turning the fan on.

I will point out that the relay activation ECU pin is not constantly grounded on full stand alone ECUs like Haltech, Link etc. as they rely on the logic parameters to ground the input. In the case of a Power fc D-jetro map sensor vesion this pin is completely made redundant so the fan will never turn on.

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"G" Contributor

"G"

Posted
Posted
24 minutes ago, GTSBoy said:

Actually the above diagram is from MSPaint. I took the snip from the original diagram from the manual, pulled out the ECU connections and made it generic for an arbitrary fused power supply, relay, thermoswitch and main load.

I don't see your diagram. 

BK Grand Master

BK

Posted
Posted
3 minutes ago, "G" said:

I deleted my air con, everything under the hood. Now it won't activate at all. I want to create a stand alone circuit that activates the fan at 194d. 

Manual states 90c +/- 3c just so we are not talking Fahrenheit rubbish.

  • Like 1
"G" Contributor

"G"

Posted
Posted
2 minutes ago, BK said:

 

Then as Dose Pipe said your wiring has been stuffed with unless your ECU is not factory, as the fan has its own individual relay.

On the factory ECU the fan relay pin is always grounded, so if you bridge / bypass the radiator thermo switch you energise the thermo fan relay turning the fan on.

I will point out that the relay activation ECU pin is not constantly grounded on full stand alone ECUs like Haltech, Link etc. as they rely on the logic parameters to ground the input. In the case of a Power fc D-jetro map sensor vesion this pin is completely made redundant so the fan will never turn on.

mines ecu.

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