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:
Biggie is to keep the ICE from over heating on startup from cold
Gets a tiny bit to more (dependent on the hole size) flow from the ICE past the
thermostat so that it will open sooner than if no weep hole
Hottest area is typically around the CC and that is normally in the head...which
is insulated to the block by the gasket (of course gasket material factors)
By the time the CC heat brings everything up to temp...no weep hole will have the
thermostat NOT open till whatever thermostat range is designed in. They typically
do not just open/shut, but ramp (hysteresis) open/close
SMOG plays an ever larger component on how they design cooing systems today
Thank you Mark K for stepping in to provide some facts.
The weep hole of a water pump is directly related to managing the performance of the water pump seal, which is dynamic. It swells and contracts with temperature, and, the seal faces must remain wet at all times for lubrication. When the engine is cold, the seal is contracted, and coolant weeps. Newer design water pumps have a small reservoir built in that collects the weepage, so that customers do not misinterpret stains dribbling down the pump as a seal failure. When the engine heats up, the seal swells, and seepage ceases. Heat also evaporates the seepage in the small well designed to contain it.
IF seepage continues when the engine is at full operating temperature, and the contents in the well never evaporates under those conditions, and continues to over flow, then there is an issue. Otherwise, the dynamic seal of a water pump bearing is permitted to seep by design, for seal performance, not as any type of coolant bypass system for "smog" or "until the thermostat opens" purpose.
