Engine Compartment Fan Manual Switch

[AZ986S]

Why not tap into the harness wires with wiretaps?

Also, you mentioned this was only for cooling down engine bay AFTER the track session. Makes sense, but would there be a benefit in running it DURING the session to help cool airflow around the oil cooler and help keep oil temps down? How many CFMs is the fan?

[JFP in PA]

Originally Posted by AZ986S

Why not tap into the harness wires with wiretaps?

Also, you mentioned this was only for cooling down engine bay AFTER the track session. Makes sense, but would there be a benefit in running it DURING the session to help cool airflow around the oil cooler and help keep oil temps down? How many CFMs is the fan?

The oil cooler is cooled by engine coolant, not air flow. If you want to lower oil temps, use a larger cooler on a base car, or lower the coolant temperatures.

[thstone]

Originally Posted by AZ986S

Why not tap into the harness wires with wiretaps?

My solution simply adds a manual switch to command "On" the relay.

Using wiretaps and a switch to go direct to the fan would bypass the relay which is not a very good approach. Relays exist for a reason.

How To Use Relays and Why You Need Them

[boxfix]

Why not put in an adjustable thermostatically driven relay?

Any time you get 60C or more the fan goes on until it comes down to 60C.

[notech]

Hi, while attempting to get the compartment fan manually working I might have shorted some of the pins of the relay on the picture.
The car runs like poo, seems like half bank or half of the cylinders, spoiler went up and doesn't go manually down.
Car shows Christmas lights of errors on the dash, for example PSM.
I have checked the fuse box under the dash, I couldn't any burned fuses.
Anything more to check?
What could have gone wrong? Any diagrams I can get?

I am puzzled how any of the relay pins could have messed up with electronics and hopefully not a damaged ECU.

[notech]

So I'm still thinking and investigating what could have gone wrong.

on the list to do:
check for error codes and reset
check 40a fuse on relays
check maf / try run engine with maf disconnected
check coils
possible variocam solenoid

that would only partially cover engine missfires but what about PSM, ABS, spoiler lights?