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The mkiv Supra Owners Club

Transmission cooling in stock radiator question


Shane

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Nothing spectacular, its just a small section of the bottom of the rad.

OK thanks. I didn't realise it had it's own section and presumed it was just the pipe passing through the lower section. how small a section is it? So would I be right in thinking that the transmission fluid gets hot before the coolant and relies on the coolant in the rad to cool it and then as the engine warms up everything evens out to the running temperature of the engine? i.e. both coolant and transmission fluid are the same temperature?

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OK thanks. I didn't realise it had it's own section and presumed it was just the pipe passing through the lower section. how small a section is it? So would I be right in thinking that the transmission fluid gets hot before the coolant and relies on the coolant in the rad to cool it and then as the engine warms up everything evens out to the running temperature of the engine? i.e. both coolant and transmission fluid are the same temperature?

 

No I think the coolant warms up the fastest , it in turn warms the transmission fluid , up to the point the trans fluid runs hotter than the coolant then the coolant helps cool the tranny fluid

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No I think the coolant warms up the fastest , it in turn warms the transmission fluid , up to the point the trans fluid runs hotter than the coolant then the coolant helps cool the tranny fluid

OK thanks, I was basing my presumption on the fact that fluid under load in the TC gets very hot very quickly under load, whereas the coolant would takes a while from cold. Thanks again.

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The wife's Stagea wouldn't drop into lock up mode in the very cold recent weather, unt5il the transmission oil temp had risen a bit. I found it has a temp sender that keeps the converter from locking up below X degrees. The transmission cooler in the bottom of the rad works as a transmission warmer at the start of the warm up cycle, as does the engine oil to water heat exchanger on the engine block.

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