tranny noise

ozmako · 10-22-2009, 07:42 PM

I tow my boat with a chevy 2500 after a short time a noise like a fan is heard it is similuar to the noise the motor makes when you first start it when it is cold
is this normal and what would this noise /sound be is it a cooling fan kicking in ??

bustedflat · 10-22-2009, 08:02 PM

Your clutch fan has engaged due to temperature. When the motor is first started the fan runs until the fluid in the fan clutch loosens up. When you say a short time what do you mean? 4x4 with 410 gears used to make that fan roar on takeoff most of that time. What year is your truck?

ozmako · 10-23-2009, 12:44 AM

Hi Busted it is a 2005 2500hd the noise comes in after towing the boat in drive for about 20 mins half hour where i live it is fairly hot at times
It only makes this noise when towing thanks for ur reply

epanzella · 10-27-2009, 09:55 AM

Just watch the temp guage - you should hear the fan come on at a certain temp and the temp needle will start dropping in a few seconds. When it gets to a certain point the fan will stop. Once you learn these two points (which will be particular to your engine/gearing/loadcombination) you'll be more informed as to what's going on under the hood.

wmalloy382 · 10-27-2009, 10:15 AM

Oz,
Just a thought -

This something you may want to consider.
http://www.uhaul.com/hitches/transmission-cooler.aspx

By adding the transmission cooler you will keep the temps in the Tranny much lower. The fastest way to rip up the tranny is to overheat it.

Its just a cheap insurance policy and places like U haul or you local mechanic can add it for low money.

diet-saltair · 11-04-2009, 12:48 PM

You didnt say what trans you have. With a Dmax diesel or the 496 cu gas ( 8.1 ) it would be an Allison trans. They have a cooler with a fan that comes on at about 210 degrees ( that trans temp, not engine ).

The cooler/fan is under the truck on drivers side. If the noise is up front, its the engine fan.