heat is a transmission killer
to install a auxiliary transmission oil cooler
for Transmission Oil Cooler
Save Your Transmission by Reducing Heat
transmission cooling system uses the engine’s radiator to cool the
transmission fluid. Thus, when your engine runs hot your transmission
also runs hot. The transmission can also overheat in stop and go
traffic, when traveling on mountain roads, when towing another vehicle
or trailer and on long trips. Numerous other conditions,
including low fluid level can also cause your transmission to overheat.
More often than not, when a transmission overheats, it can go
undetected until the trouble symptoms begin to show up. By
then, the damage is done - a rebuild or replacement is normally needed.
your transmission from overheating and you eliminate the #1 cause of
premature transmission failure.
throughout this Website, excessive heat is a transmission
killer. Keep your transmission from overheating and your
chances for transmission failure are drastically reduced.
The best way to
insure your transmission does not overheat is to install an auxiliary
(secondary) transmission oil cooler. The cost is minimal and
the installation is easy. A person with minimal automotive skills can
install a transmission oil cooler in a couple of hours or
The job of
removing and replacing an automatic transmission is not tremendously
difficult - it's just a matter of being prepared, being safe, and
Transmission Oil Cooler
Installation (Step-by-Step Guide)
Installation instructions may be included in the transmission oil
cooler kit you purchase. If so, follow those instructions first and use
this information only if needed.
> Screwdriver for hose clamps
Hand Drill and a selection of drill bits
Razor knife to cut rubber cooler hose
Hacksaw or small pipe cutter to cut cooler lines
drain pan or small container to catch fluid
Cut hoses so
they are a couple of inches longer than your rough measurements.
must mount no closer than 1/2” in front of the radiator or A/C
condenser. The secondary transmission cooler must be securely
mounted so that it does not come in contact with any moving parts.
1. The transmission cooler kit you
purchased will include the mounting
hardware needed to mount the cooler. The cooler should be
½ to 1 inch in front of the radiator or A/C condenser for vehicles with
Find the oil
cooler lines. These are metal tubes that connect to the
transmission on one end and the radiator at the other end.
3. Position the auxiliary transmission
oil cooler so its inlet and outlet tubes face the existing transmission
oil cooler lines.
With the mounting hardware provided with your oil cooler kit, mount the
cooler 1/2 to 1 inch in front of the radiator or A/C
The cooler may be mounted in a different location, but doing so may
reduce the cooler’s effectiveness.
Connect the cooler using the illustration below as a guide.
On all automatic transmissions, the transmission oil flows from the
transmission through the original equipment cooler, (which is located
inside the radiator), and then back to the transmission.
auxiliary transmission oil cooler is installed, the heated transmission
oil flows from the transmission to the original equipment oil cooler
inside the radiator - then to the auxiliary oil cooler and then back to
the transmission. See illustration below.
Place a catch pan under the radiator. Using an open-end
disconnect one of the oil cooler lines where it enters the
radiator. Now, ensure that the vehicle cannot start during
cranking. Have a helper crank the engine for just a few
seconds. The transmission oil will flow either from the
(where you removed the cooler line) or from the disconnected cooler
line. If the oil flows from the radiator, this is the
outlet. If the oil flows from the disconnected cooler line,
means the oil flows out of the radiator at the other cooler line,
making it the outlet.
Now that you
know which is the outlet, install the hose connector adapter that came
with the auxiliary oil cooler kit to the outlet neck on the radiator.
the rubber hose to either of the outlets on your new auxiliary
cooler. Slip a hose clamp over the connection point.
the other end of the hose to the adapter you placed on the radiator in
the previous step. Mark the needed hose length and cut hose
accordingly. Slip the hose over the adapter fitting and
with a hose clamp. Tighten hose clamps to 15 to 20-inch
these same hose fitting instructions for the second hose – being
certain to torque the clamps at 15 to 20-inch pounds.
Check the auxiliary cooler to be sure it is mounted securely and that
there is some space between the cooler and the radiator or A/C
2. Check the hose clamps for proper
to be sure the rubber hoses are not touching any other parts and that
there are no sharp bends or kinks.
Start the engine and allow it to warm up to normal operating
temperature. Check for leaks as the engine is warming.
Check transmission fluid level and add fluid if necessary.
installation of the auxiliary cooler should require some additional
fluid to be added.
first week after installing a transmission oil cooler and then
periodically from then on, check connections for leaks and check hose
clamps to be certain they remain tight. Also, don't forget to
check the transmission fluid level and condition periodically.
with a auxiliary transmission oil cooler installed, you can drive your
vehicle with more confidence and peace of mind knowing that a cooler
running transmission is a longer lasting transmission.
a Transmission Estimate online