I bought this 2005 Avalanche Sept.29th 2005 (brand new) & I have around 47200 miles on it & have not had any transmission problem with it before yesterday...when I put it in drive & normally start driving & the transmission starts shiffting gears, it shiffs from 1st to 2nd just find but as the speed increases & it wants to shiff from 2nd to 3rd it doesn't ever shiff, its like it goes into neutral, the engine speeds up like its in neutral, I called roadside assisstance & got a wrecker to haul it home, its ok in reverse & forward as long as it doesn't have to shiff into 3rd gear..of course Mfg. warranty is out & I was in the process of buying an extended warranty but even if I proceed in buying said exteneded warranty it won't cover this incident.......
I had the same problem, its the torque converter. I took my 05 c/a in because i was having shifting problem, the long and short of it is there is a breather on the tranmission that sucks in water from the road. the water and the atf dont mix. the dealer put in a torque converter and changed the fluid and installed a redesigned transmission breather.
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If the transmission is full of fluid. please go here to read the problems with the pressure control module--http://repairpal.com/transmission-pressure-control-solenoid-failure-may-cause-erratic-shifting-593, Hope this helps, chevy impala pcm may cause erratic shifting.
it is most likey a sticking thermostat it either gets stuck closed or open in your case closed so collant isnt getting to the heater core and all you get is cold air blowing into the truck.
its a simple fix you can either do it your self or take it to a mechanic. now remember there are differnt thermostes so think about the climat you live in and get one according to that
This is within "normal ranges" however it is an indication of wear on your alternator. If you start seeing a slow but steady decrease in your voltage it is probably time to check out the charging status of the alternator on your vehicle.