There is a sensor screwed into the rear passenger side of the block right below the manifold that has a single wire running to it. The wire and connector is corroded and broke off I duno were i would find a connector.... since its a single wire sensor im guessing its probly a knock sensor since I know its not the oil pressure sensor. Anyone know?

 

I have the same problem. It is the water temp sensor. It communicates with the computer. You can get the harness from a junkyard for relatively cheap.

 

Well is it really important? lol I guess its the cylinder head water temp sensor? My water temp guage is working fine.

 

The temp switch for the radiator fan is installed in the pass side cylinder head (right below the exhaust manifold). You can verify this by grounding the single wire connector with the engine running (or ignition on). Grounding the wire should cause the radiator fan to run, providing everything is in working order.

The connector for this switch looks similar to the knock sensor connector and takes some abuse from the high heat near the exhaust manifolds. A replacement pigtail is available from TPIParts, a board sponsor.

This temp switch does not communicate with the computer, it's sole purpose is engaging the radiator fan. You'll want to fix it as soon as possible because the fan will not operate properly without it.

The only other one wire sensor on the pass side is the knock sensor down near the starter.

 

Basically what naf said, but a little more...

If it's in the cylinder head, kind of along the row of spark plugs between the rear two plugs, it's the fan switch. It operates your secondary fan.

If it's lower than that in the block itself down closer to the starter, it's the knock sensor. It's big, fat and round. With this disconnected you'll prolly experience some knocking/pinging under heavier-than-normal acceleration.

If your wire is ok, the metal probe is still on the end, just the plastic connector is cracked and broken, it should still work. Just stick the probe into the sensor, and it'll stay in place until you get around to getting a new connector.

And both use the exact same type of connector, and you can get one from any auto parts store. It comes with a segment of wire attached to it. Just splice it in and plug it in.

 

i looked up online at the auto parts store for the fan temp switch and it shows one that has two spade terminals, for an earlier 5.0L third gen

were some spade and others round ?

 

Randy, as far as I know, only one type of fan switch was used, and it had the round end on it just like the knock sensor.

It sounds like you might be describing the temp gauge sender, which goes in the cylinder head, driver's side, between the first two plugs. There were two types of this one used during the generation. They use a slide-on connector.

The other temp-related sensor, the coolant temp sensor(in the front of the intake manifold), has two small round prongs that plug into its connector.