I am helping a relative who wants an override switch to manually force the 996 (non-turbo) high speed radiator fan(s) to run. Thanks very much in advance for help with the below questions or advice from doing this yourself. I am a car guy but not a Porsche expert. Respectfully, he wants this. I am not looking for opinions about whether this is a good idea. My questions.

1. Which relay(s) located where do I need to activate to manually force the two fans to run in high speed mode?
2.. Does one relay control both fans?
3. Are there separate relays for low and high fan speed?
4. I assume it is a 12V signal that goes to the relays coil(s) from the ECU?
5. Is there a need to isolate the relay coil from the ECU relay coil signal such that you don't have a situation where both the ECU fan control and the manual override come on at the same time (and some reverse current flows back into the ECU happens due to slight voltage drop differences?

Unrelated: Is there an easy way to make the spoiler stay up below 30mph? You can press the manual spoiler deployment but it promptly goes down again at the next red light...... It turns into German Whackamo.

Regards, Bo Andersen