My 2003 Buick Rendezvous has a ABS problem where it engages completely on its own whenever the outside temp is more than 50 degrees. While driving, I hear a humming noise at various time during my drive and when I push the brakes the ABS system is activated and the petal pulses and a grinding noise is heard. Although, the ABS light does not light up on my instrument panel. This is constant throughout the months of may through October since the temp is above 50 degrees during the day. I have had both front hub assemblies and wire harness replaced with no avail. Then, during the winter months, the AWD system disables anytime I have tire(s) spinning. I have talked to several mechanics and not one seem to have any idea what can be wrong. I have researched online finding an alarming amount of people with the same problem concerning their Rendezvous, but no solution.

- Selinsgrove, PA, USA

I just found this link today. I have been having several problems out of my 03 Rendezvous. I had my brakes changed, and everything has went to hell. The brakes rattle, my AWD disabled, and my anti-lock system light is on. I had this problem previously looked at in August 2010. Once the rotors were turned it seemed to have solved the problems. Since the warm weather has returned, the problems has started back. In addition to the brake system problems, I am looking into possible intake manifold being replaced or repaired due to antifreeze leakage. Any help will be useful. Thanks!

- Ripley, MS, USA