Saturday, Aug 05, 2023 at 09:14
G'day Tony.
Why dump hotter than boiling fluid into a radiator system which is already near boiling and has practically no reserve of cooling capacity left. Disaster approaching?
Fitting in the coldest line means; when the engine is near it's max output, ie, towing and the day is hot, the thermostat will most likely be fully OPEN but all is operating near to absolute MAX. If at or near that situation you are ALSO adding auto fluid heat at 120c + (auto working hard) to the heat exchanger/bottom of radiator, the system can suddenly have a thermal runaway and cause damage. The idea of fitting a cooler is because the water system is going to get near to or over it's ability to cool the engine AND auto. Heat dissipation is best when there is maximum difference between the ambient and the heat source, ie, air 35C to 40C day, and water near boiling point. Auto fluid is already more than 100C. So if you want to get rid of the most heat quantity then hottest line is best. That is after all, what we fit a cooler to achieve.
Yes it may over cool a little on freezing days if auto not working much. How many of those do we need to cater for? If in cold freeezing areas, cover the cooler in that situation or have a fancy temp regulated system.
Any degradation in cooling system performance ability instantly makes things worse. ie, blocked radiator fins/tubes and therefore system less than OE capable after a while. That exacerbates the original situation.
If a trans line suddenly came off, the auto would be empty in about 15 to 20 seconds maybe less at higher revs. The rate of flow with HOT fluid is high and is a positive pressure., Coolers are generally tube/fin designs, Flow rate will expel any air in seconds, once expelled how does more get in there? Air locks won' t happen. While your engine is running, even at idle speed, suddenly cut an auto hose and see the rate of flow. Solid hose flow, self flushing! How much air is retained in your garden hose when the tap is ON? Spit spit full flow with
mine!
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