Does anyone know what sensor goes into the passenger side cyl head towards the rear of the engine? Had my heads redone and they came back with no sensors and I don't know what to tell the parts guy at the store.

 

Fan switch

 

acdelco 15-4373 gm#10045782

 

Are there 2 fan switches then? I already have one on the front of my intake maniold.

 

That is the ect sensor for engine coolant temp feedback to the ECM.

 

Im pretty sure that sensor is in the front of my manifold as well. The connector that goes into the sensor im missing looks just like the knock sensor connector that goes into the bottom of the block below it.

 

The cts looks different and is a 2 wire thermistor acdelco 213-928 gm#15326386



you could repair this with a gm 12101899 and the fan switch would be gm 12102621 or acdelco PT308

 

HTH !

 

this is a one wire sensor

 

so it is not like post 3 ?

 

You should have three sensors. Fan switch in passenger side head. Dash gauge in driver's side head, and ECM in the intake manifold.

 

okay okay, i have figured this situation out. My fan was not working properly a few years bad and my mechanic ran a new fan switch on my manifold with a new wire all the way to the relay and just left the old switch in the cyl head inactive. Sorry for the confusion but thanks for helping me out!