Has anyone removed and eliminated their thermosensor completely?
Since I have the regular coolant sensor, and a PFC with Datalogit to have the fans come on at a choosen temp, I'm pretty sure I don't have a need for it and wanted to know if I could remove it and all the wiring from the engine harness. Would it be better to ground it?
What about the relay's do I still need all of them or could I ditch one them as well?
I wouldn't care if my fans just worked on medium and high.

 

Bueller? Bueller?

 

Which thermosensor? The dash sensor or the ecu sensor. Ecu sensor would be needed by the pfc for cold start. Dash sensor could go especially if you have an aftermarket water gauge. The thermoswitch might night be needed though depending on if you switch the fans with the ecu thermoswitch.

 

I never bothered to go this far with the PFC but after doing alot of rewiring on the cooling fan circuits for the LS1 conversion I found it to be quite simple to just study the diagrams and figure it out.

 

Sorry if this is elementary but I want to paint the whole picture in-case somebody strumbles in here that's not in the know.

The thermosensor and relay combo provide an extra ground to the fans at around 102-108C (of course the FC switch flips at a lower temp). With the extra ground on line the fans kick up one notch/setting when operating. I bypassed the relay completely and permanently grounded that wire from the fans...so now all I have is medium and high speeds. It's really not a big deal since (with the A/C off) my fans aren't programmed to turn on until 95C...when the thermostat hits full open. With the A/C on and the temps below 95C I'm on medium also...the fans cool MUCH better while on medium and the A/C cools a little better too.

Personally I don't think low provides enough airflow while in traffic with the A/C blasting when its really hot outside (90+F). Low alone could never keep my temps under 95C in those conditions. Once it hit 95C the fans would step up to medium and the temps would cycle 93-96C as the fans cycled. Now, fortunately I haven't seen 95C (or even close) with the A/C on but the weather only made it up to 90F so far this month.

If the A/C is on and for some reason it hits 95C it'll go straight to high...and high kicks some butt.

 

I've been thinking about doing this, but never found the motivation to cut my car apart to see if my theory works in the real-world. I'm glad to see that it worked for you, Trevor. I'm assuming you're running the PFC to control the fans' turn-on temperature?


-s-

 

Yep...datalogit.

 

Great another couple wires to pull from the harness!