Articles


Get Our Newsletter!
Monthly specials, new products, hard-to-find parts.
Your Email Address:

Vanagon Articles, Resources & Tips > Articles  > Automatic Transmission Cooler

Automatic Transmission Cooler

As parts go obsolete and businessís search for solutions, itís great when advances in technology from the intervening 20 years can be incorporated in designs of replacement products. Foreign Auto Supplyís new automatic transmission coolers offer a prime example. Stock transmission coolers utilized engine coolant run in proximity to automatic transmission fluid, risking harmful fluid mixing and requiring expensive coolant hoses. Currently available external transmission coolers have their own pitfalls, being bulky and utilizing external lines and fittings that are prone to leaking and all of which is prone to impact from road debris. The Heat Sink is a compact, efficient solution that provides superior cooling. Automatic transmission fluid runs through the various passages to the cooling panels with four times the surface area of the stock cooler. The part tucks up above the transmission mount where the stock cooler was mounted.

Keep in mind that these transmissions do not require significant cooling. 84 and older models did not even use a cooler on this same transmission. And this same transmission (automatic section only) is also the one that was used in 87 to 92 Jettaís, again with no cooler. The stock cooler actually runs warm coolant through it. Testing of new cooler, with fluid temp gauge attached, shows improved temperature both while run under heavy load and while vehicle is running but not in motion. With higher horsepower engines, there is more need for cooling transmission fluid so this product would be particularly recommended in those applications. This cooler has been tested by well-respected German Transaxles of America and has gotten a thumbs up from them.

The new cooler includes a hose union, offering a quick solution to hook the two coolant hoses together with no additional work or expense. To purchase this way, you just purchase the cooler. However, we do suggest considering eliminating these extra unnecessary hoses but there are some different options depending on year of van and how deep you want to get into the cooling system. First, you will need to identify which hose configuration you have. For one of the hoses, all 86 and newer models have the 3 way hose 025.121.062F that starts at the thermostat housing, travels over the transmission and attaches to one of the long pipes that heads to the radiator, and has the branch that goes to the cooler. For the second hose, typically 86 models have a coolant firewall junction 251.121.438A with an extra outlet with just standard hose run to the cooler. 87 to 91 models will usually have a branch off the hose that goes from the tower 251.121.438B to the other long plastic pipe N.902.873.03 .

In the first case (86 and some 87 models) we recommend purchasing 025.121.062E and 251.121.438B to complete the conversion. Cooler Kit option A

In the second case (mid year 87 to 91 models) we recommend 025.121.062E and N.902.873.03.SIL . Cooler Kit option B

Now if you are purchasing a hose kit at the same time as converting the transmission cooler you would order the cooler by itself and the manual transmission version of the hose kit (I know, a bit confusing, but you are eliminating the automatic element of the hose kit)(Exception is 86 Automatic as you will need the manual hose kit but will also need the 251.121.438B)

As such we offer it below in three options.
1 Cooler
2 Cooler Kit option A
3 Cooler Kit option B


print