Leaking transmission cooler lines12/15/2023 ![]() ![]() If this hose fails, it can cause the transmission to overheat and fail. This hose carries hot fluid from the transmission to the radiator where it can be cooled. The hose that goes from the transmission to the radiator is the lower radiator hose. What Hose Goes from the Transmission to the Radiator? The lower line is the cold side and returns cooled fluid back to the transmission. The upper line is the hot side and carries fluid from the transmission to the cooler. The transmission cooler lines are the two hoses that connect the transmission to the radiator. Transmission coolers are used to keep the transmission fluid from overheating. So don’t wait – get your hands on one today and keep your transmission running cool!Ĭredit: Which Transmission Cooler Line is Which? Whether you’re just doing some routine maintenance or troubleshooting an overheating issue, this 4R70W Transmission Cooler Line Diagram will be a valuable resource. It also includes instructions on how to install an aftermarket transmission cooler, in case your vehicle didn’t come with one factory-installed. This Cooler Line Diagram shows the proper way to route your transmission cooler lines for optimum cooling. That’s why it’s important to have a good transmission cooler line setup – and that’s where this diagram comes in handy. It’s known for being reliable and durable, but like all transmissions it can suffer from overheating if not properly cooled. The 4R70W is a popular transmission found in many Ford vehicles. This helpful guide will show you exactly where to find the Cooler Line Diagram for your 4R70W Transmission. If you’re looking for a 4R70W transmission cooler line diagram, you’ve come to the right place. It is always important to follow directions when it comes to installing or repairing anything, and this diagram will help you do just that. This particular diagram shows how to properly install the lines so that they will not leak and cause problems. Another 30 minutes of driving and I would be shelling out six large for a new tranny.The 4R70W transmission cooler line diagram is a great way to keep your transmission cool. It was a fluke that I stopped and noticed the trail I was leaving behind. ![]() I lost over one gallon of fluid in 15 miles. You could easily blow a tranny on this factory mistake. Took me half a day to do all the runnin' around but I don't think I will ever be stuck dripping/pouring tranny fluid on the side of the road ever again. check valve that matched the 1/2" hyd hose to improve flow for another $20.00. There is also a check valve on one of the stock hoses which is a joke, 1/4" I.D. They made me custom hoses that fit the new nuts on the cooler side and matched the stock fittings on the tranny side, about $30.00. Reinstalled cooler and took the measurements for the new hydraulic hoses. Went down to the local hydraulic hose shop and purchased some aluminum nuts and welded them to the damaged ends of the tranny cooler. I wasn't messin' with the stock set up this time. Second time around, on the 3500, same thing happened. With all the vibrations of a Cummins, it's a ticking time bomb. The leak happens just inside the hose end directly before the O-ring seal. The SS clamp inside the hose end eats into the soft aluminum of the cooler. Tranny shop found the leak but not at the hose, was on the tranny cooler line. Quick connect, great idea but Dodge engineers screwed this one up. I have a 20 and a 20 both trucks started leaking at the trans cooler/hose connection.
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