4.0 Radiator Question

[lowsinthe20s]

I have a radiator from a 4.0 auto. I swapped the motor over to a B2 as well as change the trans to a manual. The auto radiator has two brass fittings for the trans cooler. I'm trying to find out what size these threads are and if it is possible to plug one and use the other for a temp sensor for the electric fan. I though is was a 3/8's pipe fitting but those just won't thread on.

Any one done this before and know what size/kind of threads these are? Or do I need to get a manual radiator? Thanks

 

[franklin2]

For your electric fan to work the best, the switch probe needs to be in the coolant itself.

If you just put it in the radiator like that, the fan activation will be delayed, and then it will tend to run all the time. I have my electric fan temp probe wire tied to the top of the radiator. I have it set where it comes on around 200 degrees, but then the ambient temperature under the hood and the radiator frame will make it run more than it needs to. It works, but not the best.

 

[RonD]

Automatic radiator is fine to use and you don't need to plug the trans cooler ports, there is no connection inside with coolant passages

Best place to mount an E-fan temp sensor is on the upper or lower radiator hose using a "bung" like this: https://m.media-amazon.com/images/I/51vBixd8b1L._AC_UF894,1000_QL80_.jpg

They come in different sizes of course this is just an example

They need to be grounded same as the temp switch, thats what the bolt/stud is for

Upper rad hose temp switch would be set at a higher temp than lower rad hose setup
And upper rad hose switch needs to be on the side or bottom of the hose so its ALWAYS immersed in coolant, upper hose can get air in it

 

[lowsinthe20s]

Automatic radiator is fine to use and you don't need to plug the trans cooler ports, there is no connection inside with coolant passages

Best place to mount an E-fan temp sensor is on the upper or lower radiator hose using a "bung" like this: https://m.media-amazon.com/images/I/51vBixd8b1L._AC_UF894,1000_QL80_.jpg

They come in different sizes of course this is just an example

They need to be grounded same as the temp switch, thats what the bolt/stud is for

Upper rad hose temp switch would be set at a higher temp than lower rad hose setup
And upper rad hose switch needs to be on the side or bottom of the hose so its ALWAYS immersed in coolant, upper hose can get air in it

Thank you for the info. I didn't realize that they didn't need to be plugged.