I had to change serpentine belt on my road trip in "professional" service. They changed belt tensioner also. When we continued we realized that cruise control and most of A/C buttons don't work. So we drove back and they fixed it by tightening/connecting some tiny vacuum hose.
But now we are hearing much more noise from car (transmission) when on 1st and 2nd gear. So during uphill and starting its like tractor or some diesel engine. Not always. Usually in morning or when engine is cold. But in steep uphill kind of always.
And switching those first gears make really bad sound - like its teeth (if there are some) make friction. Again - few days later - it's not making any sound when manually switching 1st and 2nd gear. Just automatic switching makes louder (bad) noise than before.
I'm sure before service it was ok, because we drove 100km with partly-teared serpentine belt to the service without these sounds. I know there was slight sound when changing first two gear before, but nothing serious I would say - just normal switch.
Also I hear different sound from car than before - I hope it is the new belt and tensioner - it's like fast repeating ticking. I can recognize it when idling.
So is there something which could be disconnected or otherwise had some negative effect on transmission during belt change?
- Chevrolet Lumina APV (minivan) 1996, 3.4L V6.
- Automatic transmission
- 4 gears (1,2,D,OD).
- Engine was replaced around 137,000km together with transmission.
Don't know when was the transmission oil changed last time so let's assume it was not. Car has now 209,000km.
Ad 1: At morning I tried manually switching to every gear and 1st made that “friction” sound.
Anyway “drastic” sound change occurred after belt change.