So, while delivering mail, my 99 Blazer decides to switch into 4wd High all by itself. This has happened about 3 times now... It always seems to happen when the engine is hot and I am making a sharp turn ?? Any suggestions. I had a new trans put in about 30,000 miles ago along with a trans cooler. Could it be a bad switch ??

Appreciate any suggestions on what it might be !!

 

i had a S-series blazer do that to me one before, and it ended up being the switch was bad in the dash... hope this helps

Ck1500