I have an L98 350 and I'm wondering what sensor is the one located next to the coolant temp sensor because I had a problem with my primary fan running all the time and when I disconnected the wire to this unknown sensor it shut off. I have a manual that says its the coolant temp switch but I cant find any other info on it

 

I believe the coolant temp switch is what enables the cold start injector circuit.

 

I wanted to know what sensor is the one left of the cts

 

Again, that's the cold start injector switch. The coolant temperature sender is on the right.

IIRC, the way to keep them straight is the cold start injector switch has the same connector as the eight (nine) other injectors.

HTH (I just figured out what this stands for).

 

Ok thanks.. Any idea why the fan shut off when I removed the connector

 

Because with the connector unplugged, the ECM thinks the engine coolant is cold.

 

Drivers side fan now comes on when u start the car for about 1 'min then goes off. Any ideas?

 

Faulty sender.