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The Hummer Knowledge Base
Transfer Case Cooling Loop Recall (or "Satisfaction Campaign"):
RECALL - 1997, 1998, 1999 & 2000
This is from a recall notice sent by mail from AM General:
PROBLEM: The cooler located within the transfer case may develop a leak allowing fluid to drain from the transmission into the transfer case. If uncorrected, this condition will eventually drain the transmission completely resulting in possible damage to the transmission and the central vent system.
RESOLUTION: Your dealer will replace the cooler and install additional mounting clamps that will prevent a welded pipe joint on the cooler from cracking. This procedure will be performed at NO COST to you.
HOWTO: Call your HUMMER Dealer to schedule an appointment, Reference Number AMG R0101
FYI I saw the service bulletin. Take a look at the last 8 numbers of your V.I.N. If yours fall in between the following two numbers you get a free cooling loop upgrade. VE176477 -YE188328
I recently replaced a friend's cooler loop (vampire) and took some pictures of the new style loop. It has the blue band on one of the ends (so it can be identified without opening the t-case), and has an additional support on it.
Check the two pipes coming out of the t-case to see if there is a blue band around one of them. If there is, then you already have the new version loop.
Photos and descriptions courtesy of Dave Breggin
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