I need a temp sensor the will operate the primary electric fan and screw into the intake manifold on a 350sbc, the other fan is on toggle switch for when I run the car extra hard:)......anyways I have 2 30amp relays, one for each fan .........does anyone know where I can find this at and what does it look like?......also are they adjustable on the degree when it will kick it on?.....any advice is welcome and pics are even better!........Thanks Ghost

Yes, a temp switch from any engine that has a coolant temperature sensor (for example, a 1981 Camaro with the ECM or any thirdgen or anything else that has a fuel injection system on it)- the sensor is basically a switch that turns on when the coolant reaches a specific temperature- I have this on one of my fans and use it as the switch for the relay connected to fan. However- these "factory" sensor/switches are not adjustable (most switch on/off around 180-200*). Some of the aftermarket electric fan companies (Mr. Gasket and such) also sell a "kit" with an adjustable sensor- but it gets stuck to the side of the radiator or wrapped around the upper rad hose- not screwed into the intake/block.

I've gotten an adustable switch at the local parts stores that has a probe that goes in the radiator fins, or I just wiretie it to the side tank. Cost about $20. Call and ask around. There are several that screw into the head or intake but they are not adjustable.

Good write up on this thread for the third gen cars:

http://thirdgen.org/techbb2/showthread.php?s=&threadid=260999&highlight=fan+switch

Hypertech makes what your looking for. You need to know what temp you want it on at and buy the corresponding part. :cool:

well I have a 160 degree thermostat right now , so I would probably want it to kick on at 180 degree just to allow some room to run and to keep the fan from running all the time right?......Ghost.........also I have seen the probes in the radiator and it is a 10-20 degree difference than in the intake manifold.......I would rather have it in the manifold.......

Check out part number HYP-4026 on summit. On at 176 off at 166. If I remember right this ran all the time with my 160 t-stat. The 4028 is on at 200 and off at 185. I have a 4028 just taking up space since I went to TPI. Email me if you want to try it, I'll make you a unbelievable deal.

You have PM dave(knuckledragger)