Maybe you’re not getting the nuts tight, or somebody is screwing around with you.
Your owners manual should tell you the correct torque for tightening the nuts. Use a torque wrench, not feel (or screeching sound). Most aluminum wheels get torqued to about 100 lb/ft, but check your van for sure. This serves 3 purposes:
- Helps prevent brake rotor warpage
- Prevents overtightening of lug bolts (which can stretch or break them off)
- Keeps the wheels on