2005 Chevy Silverado Transmission Fluid As already mentioned, the flow direction of the transmission cooler is such that the top hose attachment is the hotline, and the bottom one is the cold line. the hotline is the fluid returning from the transmission, and the cold line is the fluid returning into the transmission. however, that’s just a rule of thumb, so it could be the other. Thanks transman, i knew you could find it!!! like. k. katjar503. 215 posts · joined 2010. #7 · oct 7, 2010. flow goes like this, out bottom hose to the radator out of the radator to trans cooler (preferd hot to the top cooled out the bottom) then back to the top line of the trans. transman. like.
Automatic Transmission Cooling System The 4l60e transmission cooler line flow is very easy to follow. as the gif above shows, the bottom line is the hot line which sends warm transmission fluid out to the factory trans cooler within the radiator at the lower port in most cases. fyi, some vehicles have the factory cooler on the bottom of the radiator, but simply follow the lower. Because of this, the tru cool 40k is the best transmission cooler upgrade for your 1500 or 2500hd (6.0 or 6.2 gas engine) silverado or sierra. the image below shows the difference between the tru cool 40k and factory external cooler. while many gm trucks come factory with an external cooler, it is not big enough to provide the cooling needed. Below is a basic silverado and sierra transmission cooler line diagram showing the standard hot (send) and cool (return) lines as the flow through a factory cooler setup. so whether you have a 4.8, 5.3, or 6.0 ls powered truck , an older 5.7 small block, or a more modern truck with an lt motor, the transmission cooler flow is very similar. First, change the transmission filter. even a filter that is slightly clogged will reduce the flow of fluid, resulting in higher friction, and friction builds heat. next, consider changing the smooth transmission pan to a finned automatic transmission pan. by building fins into the pan, you increase the surface area that cool air passes by and.
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