Trans cooler fliud route
Although I've been towing for years, and have always had a transmission cooler on every tow vehicle, I can't remember whether the fluid should come from the trans thru the cooler then to the rad and o...
Forum Discussion
BenK wrote:
I'm not buying that synopsis and still say for thermal management of the hottest place on any ICE (piston) and that is around the CC
You aren't buying the synopsis of the purpose of a weep hole on the front of a water pump? You still believe that the weep hole in a water pump pulley shaft seal is for "thermal management around the combustion chamber"?
AirTex, a leading water pump manufacturer, produced a very simple to understand video explaining the purpose of weep holes and weep hole reservoirs on the front of water pumps. It can be seen here:
https://www.youtube.com/watch?v=UpcrfS-x5jA
On one of my tow vehicles, the manufacturer provided a photo explanation that makes it even quicker to understand the purpose:
And as for the "3/32" orifice on the thermostat you mentioned as being the same size as the weep hole, neither orifice is large enough for a bypass port that would allow the pump to recirculate coolant to bypass the radiator until the thermostat opens.
The manufacturer of one of my tow vehicles provided a drawing to illustrate the size of the port for the purpose of "thermal management"... ie, bypassing the radiator so that the engine can get up to operating temperature sooner, in part to reduce smog. The port is many times larger than that of a weep hole. In fact, the manufacture increased the size of the bypass port early on in a design update:
The comparatively tiny orifice on a typical automotive thermostat flange with a little "jiggle" valve through it is for bleeding air, not for coolant bypass. And the orifice in front of a water pump at the pulley bearing is for the shaft seal.
