Got a question for the knowledgeable folks here.
On a 1997 Chevy K series pickup, the transmission has bot a cooler in
the radiator, and an external cooler mounted in front of the radiator.
Is the cooler in the radiator shell immersed in the radiator coolant, or
is it a separate air cooled only thing that is just mounted coaxially
with the radiator?
If it's in the radiator coolant, then wouldn't the fluid always be at
whatever temperature the coolant is, which seems to be 195, as that is
the thermostat open temp?
I burned up one trans due to a clogged external cooler. Added another
outboard Hayden, in addition to the factory one that I replaced, so I
now have 3.
Coolant flows out of the trans, into the radiator cooler, out of the
radiator and into the factory external, then into the Hayden and back to
the trans. With a temp sensor mounted in the side of the pan, trans runs
at 120-130 with no load. Today, pulling a 26' enclosed car hauler with a
6000 pound load inside (trailer weighs 2600 empty), total load just
under 9k, the temp was averaging 140-145, with one brief jump to 165
going up a long 6% grade. Outside temp was 75'.
Are those temps OK? Do I need to worry about it running too cool, or is
there such a thing as too cool for a transmission?