radiator fan problem

[Mr Crow]

My temp gauge has always ran around 160-180. The other day it was up around 200. I opened the hood and noticed the fans were not running. I figured it was the coolant temp sensor. Replaced that but no change. Also replaced the 5 pin fan relay.Nothing. I unplugged the short harness from the sensor and the fans run. When I plug it back in, the fans stop. I would think they would stop when there is no power going to them or is there another source? Any help is appreciated.

[Wisconsingrandprix]

replace coolant temp sensor on the manifold cause it feed the gauge in the dash

[Mr Crow]

Do you mean the sending unit for the gauge?

[Mr Crow]

I have looked all over for a sending unit. I have a Haynes manual and it shows th early 3800 but not the Gen II. There is nothing on the front of the motor like it says. This book doesn't show much as far as the 98 motor goes.

[Explicit_Spade]

Welcome!

Have you tried replacing your thermostat?

[Fivefingerdeathpunch]

200 aint hot.

the fans wont even turn on till 214ish

[Mr Crow]

I'll try a thermostat tomorrow. This car has never gone past 180 until the other day. All of my cars are 89 and older, so this is new for me. I appreciate all of the suggestions though. Let you know what happens.

[Mr Crow]

I'm putting the thermostat in today. Is there any special way to put the antifreeze in? Do I have to bleed the system?

[Mr Crow]

Installed the thermostat. No change. Unplug harness to sensor, fans go on. Plug it in, they go off. Could it be that the new temp sensor is defective? I have seen it happen.