Examined my cooling system. Fans are not turning on..

[Hollo]

Ok so i replaced the busted hose I had causing a coolant leak with a barb and 2 clamps.. and I examined the entire system, the leak is now fixed (i will definitely see after I drive around).. But my fans are not even coming on at all. and the temp got into the red after I let it idle for awhile, so it had a chance to turn the fans on. Where do I begin to check, trial/error?

Also, when I first go for a drive (this has been happening since before I replaced this hose) The temp will climb up into the red zone about 260, and then all of a sudden after a few minutes of driving the temp will drop down to around 180-190 and stay there, which I'm guessing is when the thermostat is opening. Is that a bad water pump causing that or what?

[z28punk]

find the relays that control the cooling fans. there should be 3 of them. put a jumper wire across the relays to turn them on. if they dont work on any of them, then replace the fans. if they do work then it will get a little trickier

sorry in advance for the oversized image

[z28punk]

[Hollo]

I swapped a few relays around, and they still didnt work.. When I turned the AC on.. which it's supposed to..

[bigrondownhiller]

could be the sensor on the block that tells the computer what temp the engine is at.

[Ed Blown Vert]

I would check the thermostat.

[Hollo]

Thermostat was installed no more than 3k miles ago. Is there a way to test the coolant temp sensor without replacing it?

[35thAnniZ28]

thermo might bec stuck

[Ed Blown Vert]

Then you probably still have air in the system.