Thanks for the response, I've pulled the grill and bumper cover and was unable to locate the sensor there. I have ordered a GM shop manual for the 97 van but unfortuanatley won't get here for another week. Trying to get it back on the road as it's my wifes DD.There is only 1, usually centrally located on the front of the van. Says in the FSM for the 98 that it's on the front frame crossmember. Should be the same for the 97.
View attachment 282944
Thank you so much, I'll recheck. Picture is what I was looking at.It is pretty much behind the steel bumper. I don't think you will be able to see it from the front very well with the bumper still on. It is between the the bottom of the radiator support and the frame. You can see it mounted in this pic of this van (97 I think?) View attachment 282945