Transmission cooler

[Neubs]

Hi everyone. New on fourm. If this isn't the right thread to post my question I apologize. I'm about to hook up a transmission cooler to my 87 grandprix. When I hook it up, do I leave the bottom transmission line hooked up to the radiator, then splice the top line to the cooler have it flow through the cooler then have it run back to the existing top transmission line to the transmission?

 

[1320John$$$]

No your heat the fluid back up and defeat the purpose of having a external cooler

 

[Neubs]

Isn't the top of the radiator the output that runs back to the transmission

 

[1320John$$$]

Isn't the top of the radiator the output that runs back to the transmission

No it cools top to bottom like the engine coolant
Water pump pulls from the bottom of the radiator

 

[Neubs]

So it would make more sense to have the cooler installed after it goes through the radiator then back in the transmission. Wonder why it says in the manual to do it before it goes back in the radiator then in the transmission.

 

[Neubs]

Didnt mention it was a th350 trans

 

[bracketchev1221]

I would put the external cooler on the outlet of the radiator cooler. This may require removing both lines and starting it to see which is pressurized. I’ve done this putting rubber hoses into containers and starting and shutting it off quick.

 

[lilbowtie]

So it would make more sense to have the cooler installed after it goes through the radiator then back in the transmission. Wonder why it says in the manual to do it before it goes back in the radiator then in the transmission.

Are you reading your manual right? Mine says to "splice the auxiliary cooler into the return line" going further to explain return to trans.??

 

[WanaBa442]

This is the way I've always seen it done.

 

[1320John$$$]

Didnt mention it was a th350 trans

The bottom one is the return going back to the transmission