How does the fan work

[WhiteFinish]

Anybody who can explain me how our fan works ?

When the ecu reads a certain degree (200 fahrenheid i believe) it will turn on the fan.

So, in wire terms.
Wire from ecu runs to relais, from relais to fan
Another wire from temp sensor runs to ecu, this one triggers to before mentioned contact ?

If I want to measure contact; it's not possible when there is a relay in between?

[Nd4SpdSe]

Depends on if it's a 4cyl or V6, and depends if it's an auto or manual.

Triggered at 212*F (100*C)

V6 auto had a 2 speed fan, low draw is 12amps, high speed is 17amps
V6 5spd had a 1 speed fan, 11amp draw.
(little tip there for anyone having heat issues)

[WhiteFinish]

When I checked the wire scemetics it says: pin 3L, Yellow, Black with a Pink block.

But I assume that one will run to the Relay.
From the relay 2 wires go to the fan. Yellow with silver block & Black with silver block.

How is this relay activated ? By ground pulses or 12v ?

[Nd4SpdSe]

When I checked the wire scemetics it says: pin 3L, Yellow, Black with a Pink block.

But I assume that one will run to the Relay.
From the relay 2 wires go to the fan. Yellow with silver block & Black with silver block.

How is this relay activated ? By ground pulses or 12v ?

ECU pins would be to trigger relays, the wire gauge couldn't handle being connected to directly power the fan.

Relays look to be Ground triggered from the ECU

Each relay will have 4 connections:
- ECU Ground trigger to turn on Relay
- Small gauge 12v to supply the relay trigger circuit and charge up the coil
- Larger gauge 12v source directly from the battery
- Large gauge matching the 12v battery source that will power the fan