Friday maybe, on the People's Court, a transmission mechanic said that
the customer's car had leaked at the engine thermostat, he'd lost a lot
of antifreeze, and the antifreeze cooled the transmisson fluid, so the
transmission overheated and needed 200 dollars worth of parts (he said
he didnt' charge for labor.)
I don't pay much attention to these parts because afaik every water
cooled car on earth with an automatic transmission works the same way.
That is, the engine cooler and transmission cooler are on the same
brackets, but they are totally unrelated to each other. I've never
seen a supplementary oil cooler, like with a trailer package, but I
figure it's even more! true for that.
IOW, the mechanic was lying. Is my impression of the way all cars are
made correct? Was the mechanic lying?
My 1995 Chevrolet work van has a transmission cooler
line that goes into the radiator (glycol filled radiator)
and back to the transmission. The two fluids do not
mix, the TX cooler line goes through the bottom of the
green glycol. So, in my one vehicle a loss of glycol
antifreeze might contribute to TX over heating. My
1998 Blazer also has TX cooling line that goes in and
out of the radiator. I side with the mechanic.
I agree with Stormin. Most likely the transmisiion cooler is built into
the radiator. When the radiator coolant fails the transmission cooler won't
work. This combined radiator is quite common.
I think it might be the part about "the customer's car had leaked at the
engine thermostat, he'd
Which was probably misunderstood by the customer . HOWEVER this time Chris
is right , in most vehicles the tranny oil is cooled by a heat exchanger in
the radiator , lose coolant and both the motor and tranny overheat . Some
vehicles <usually those meant to tow bigger trailers> will have a direct
air/oil cooler in addition or instead of the in-radiator unit .
When I had F250(trailer towing special) with 30' 7000 lbs. fiver, I
installed aux. cooler in series with original cooler. Mind you the rad.
was heavy duty one too. Any how I never exprienced over heating running
around in the Rockies during summer month. I know tranny oil running to
cool is bad too. I have ??? on this "leaked at the engine thermostat"
This sounds funny.
He's not likely to be lying..
As pointed out by others, the transmission oil cooler is inside the bottom
tank of the radiator. Heat exchange is completely dependent on coolant
flow, which is created by the engine's water pump.
If the coolant level is allowed to get too low, the pump will have
insufficient "bite" on the fluid to be able to push it around, and either
or both engine and transmission will eventually overheat. And it will be
the tranny that feels it first. Overheating is a primary cause of automatic
Even worse yet - when's the last time you saw a rad with a "bottom"
tank - particularly on a Honda?The heat exchanger is vertically
mounted in the SIDE tank - and as the water level drops more and more
of the cooler is exposed to mostly (hot) air instead of coolant, so
the trans can overheat while the engine still gets enough cooling to
Running too cool is generally not an issue if you keep the rad
cooler installed - idiots that bypass the rad cooler are just asking
for trouble, IMHO.
As for the leaking at the thermostat - lots of DIYers, and even a fair
number of "mechanics" damage the thermostat housing when replacing
thermostats - or just screw up the gasket installation.. Or the hose
is a bit loose at the thermostat housing, causing a very slow seepage
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