Even though this is stated for the Cummins I disagree.

I have read where guys say if coolant flows too fast it will not have time to pick up the heat. That statement is not logical, as long as there is coolant contact the rate of heat transfer is the same. All trimming the fins would do is lower pressure at high rpms and of course increase the heat at lower rpms.

 

Getting off tract with talking about gas burners. I agree with Opie. Never take OEM skuttlebutt for being iron clad. Thanks for posting on this subject Op..

 

OK, Cummins T-stat installed, replaced the locked up fan clutch. Truck runs at the very right edge of the middle section on the temp gauge, it will return to the middle if I throttle back. So my temp issues are directly RPM related.

It appears the locked up fan was actually helping cool the engine at higher RPMs. So I guess there is not enough cooling capacity to keep the temps down at higher RPMs, but is there enough capacity to keep temps down at lower RPMs with a heavy load? That will bge the question

 

So you think yours is the only one made of the 93's that requires a larger cooling capacity. Cool. Internet TS is a difficult way to go. There have been several trucks that get fixed rather quickley when taken to a reputable shop.

 

From your statement I would gather that you have put a bigger radiator in a 1st gen? Did you just add a core to the stock tanks, or did you go with something custom?

 

I've heard of another solution and from what an old time raidator guy said he has done this to several '93s with very good results. He removed the end tanks and instaled baffles in them to force the coolant into an "S" pattern through the radiator then reinstalled them. What this does is to allow the coolant to use the full radiator rather than take the shortest route. It also allows the coolant to give up more heat as it flows through the rad. If you really want awsome cooling the Horton is an excellant performer.

Bob

 

I am pretty sure that this solution is only for the 89-91.5 non IC radiators which are a down flow design with the inlet and outlet on the same side. The IC radiators are a cross flow with the inlet on one side and outlet on the other, so the fluid is going to naturally flow through the whole thing.

 

It was definitely '93s. The reason I remember is because we were talking about my truck. This would not work on a down flow radiator.

Bob

 

What is "the Horton"?

 

The Horton is an electronic fan - same type of fan used on Over the road trucks. They are spendy but can move some serious air - quite a bit more than electric fans. They also run faster as engine speed increases. Try a search in the archives. I've provided installation instruction and wiring diagrams for a couple of guys.

Bob