im planning to do my dual pass and upgrade pump next weekend. i got looking at the plumbing and it apears with the dual pass they move the pump from the cold side (coolant going from heat exchanger to pump to manifold) to the hot side (coolant from manifold to pump to heat exchanger).

gm dual pass diagram


does anyone know why they do this??? i was racking my brain and cant come up with any logical reason for it. because of the design of my pump here is what im thinking of doing



that is basicly the same as the stock setup is with the pump on the cold side. the reason i want to do it this way is it will simplify the plumbing. i dont see any reason this wouldnt work.

any thoughts???

 

the plumbing shoudlnt be any easier or harder...but yes, both systems will work the exact same

 

with the design of the pump i chose to run it will make everything look a little cleaner if i do it the 2nd diagram. i didnt think it would make much of a difference were the pump is located, i just thought id make sure there isnt some huge reason that i dont know about for it changing.

 

Biggest problem with reversing the flow like that i've found is getting air trapped in the manifold. I prefer to have the out from the manifold going up, so any air will continue out into the hoses, rather than settle in the cores and reduce efficency.

Not really a big deal, make sure everything is plumbed well, no kinks in the hoses, and the pump is good, and you are fine.

 

smart & simple

 

its not really reversing the flow, its just changing the location of the pump. the gm dual pass puts the pump after the manifold, instead i want to put the pump before the manifold

 

I'm saying, with the GM instructions you have or whatever they are, they show it coming down from the manifold to the pump. I would avoid that arrangement if possible, hot or cold side regardless, I'd have the in to the manifold coming from the bottom (where the pump is) and the out going higher than the cores to the reserve tank or whatever you use. Just my opinion.

 

thats just how i drew the pic, i would actualy have it going up so the highest part of the system would be the surge tank, thats common sence.

my point out of this thread is weather or not ill run into problems with the pump location with the dual pass.