This is the first time it happened.
The weather temp.is mid 70s.the traffic
is stop and go and my eng. temp.went to about
85.I notice that upon take off,my car will
move a little and shift to 1st gear.It only
happen when the fan clutch start howling.(engaging)
Can this be the result after I change my
trans fluid?(1st change since I bought the car 2yrs ago.)
No power loss,In fact I love the feeling of starting in 1st.
It goes back to normal when the temp. needle fall back
to 80.Can this be harmfull to my eng.? Is there any
adjustment? Thanks.

Clauser1

I'm going to make the assumption that your car is one of the ones that has a control pressure cable from the throttle body to the transmission. When any of your auxiliaries is running, there is obviously more load on the engine. This causes you to have to push the pedal a bit harder to get moving like you normally would if that accessory were not running. This can cause a first gear start. Normally, I wouldn't expect it unless you are aggressive off the line. Check the adjustment of the control pressure cable just to be sure it isn't always under tension at idle. There should be a very small amount of play at idle. The precise amount and adjustment procedure will depend on your model and year.

Thanks Benzfan,
There is a cable from the throttle body and I guess to
the trans.Like what you said,it should have a little
slack at idle.Yes there is.AC is not on when this is
happening. How do you adjust it? 90-190 2.6.
Thanks again.

Clauser1

I think that model is the same as the 2.3. It should have a small center nut with a pointer on one side and a larger outer nut. The inner should be turned until there is about 1mm of slack, then tightened (never more than a partial turn) until the pointer aligns with a notch or raised indicator on the outer nut. This should leave the proper amount of slack. You can leave another turn if you like to delay your kickdown. I never liked that effect though. I did find that it is relatively sensitive.