When the engine is cold and 1st strated it seems to not shift out of first and the fan sounds like it is reving higher that normal. The cars seems to not have full power and the problem goes away after a few minutes, when the engine warms up. The car is good for the rest of the day.
The emission controls (or PCM) do what you are describing intentionally. There is an electrically controlled fan clutch. It is noisey when cold. The shifts are held to increase engine speed to heat up the catalytic converter faster.
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With the engine off, check your operation of the gear shift. If you can go in and out of the gears fine without the engine running, then you have a worn clutch disc that needs replaced. If the problem still exists then you either have low fluid/weak hydraulic system, or there is a problem with the syncro that may be adjusted.
Fan clutches for Envoys and Trailblazer are a problem, they go out all the time.
However, it is normal for it to do this when cold, but will only stay engaged for maybe 15 seconds AFTER you've put it in gear and have started to drive. After this, it will disengage and allow the engine to warm up faster.
If you haven't already replaced the fan clutch once, you're lucky. 2002 is especially bad for the clutches, but all years don't last long. Mine lasted 90k which is pretty long.
Fan clutch failure is common on these........and very costly to replace. With the engine cold, engine off, reach in and turn the fan, it should turn with minimal resistance, if it has heavy drag, or wont turn at all, it needs replaced.
Some modern vehicles when change the shift pattern while the engine is cold, by keeping the vehicle in a lower gear for a higher rpm while the engine is cold, the engine warms up faster, to reduce emissions. (Emissions are higher while the vehicle is cold)
What you may be experiencing is that the shift from first to second occurs at a higher rpm when the engine is cold than when warm. This can lead to an abrupt or hard shift. At higher speeds, the shift between gears either may not be changed, or just does not feel as hard as the 1st to 2nd shift.
If this is the case, then your dealer is telling you the truth and there is nothing he can do.
Clicking sound- Possible electronic fan clutch failing. This is a typical problem with the 4.2L I6. When you hear the clicking, open the hood and listen if its coming from the fan clutch on front of the engine. this could also cause abnormal engine and transmission cooling. As for the "N" light and 4wd issue, have scanned at the dealer....Hopefully this helps
Work for GM dealership.The fan can be replaced anytime and a pcm reflash can also be done anytime.If the service engine soon lamp is on because of cooling fan code it is broke!!!!! As far as the price sounds about right
What do you mean by loud... Loud where??? If noise is from engine, make sure that the mechanical fan clutch is not "locked" (it's supposed to freewheel when cold... if it does not, it will "roar" when driving.
I ran into this concern with my 2002 and my wife ran into the almost identical problem with her 2003. this may sound silly,, but it was the clutch fan. Extreme loss of power from time to time came first. Then a roar of the what seemed like the engine when stopping. Actually cut off after it started to roar at highway speeds, and had absolutely no excelleration from time to time. Sometimes all of the symptoms completely went away. After taking mine to the dealer several times, finally they got it right and replaced the fan clutch. When my wifes 2003 SLt started doing the exact same thing as my 2002 had done, we both knew what the problem was, and the dealer did a quick fix. $600.00. Perhaps this should have been a recall feature, but never was. Everyone that I know that has an envoy, somewhere around the 72,000 and 103,000 mile mark has had this problem and have had to have the clutch fan replaced. It may sound like the vehicle is going to have to be junked,, but that is all it needs.