Passenger rear wheel clunks in potholes

Hi and thanks for using 2CarPros. Com.

First, there are a few things which can cause this. However, often times it is a broken coil spring, which is part of the suspension. Simply look behind the tire to locate the coil. Check it closely for cracks. Also, inspect the mounts for damage or wear. If you find it is broken, here are the directions for replacement. The first 8 pictures correlate with these directions.

2002 Pontiac Truck Aztek V6-3.4L VIN E
Vehicle  Steering and Suspension  Suspension  Suspension Spring ( Coil / Leaf )  Service and Repair  Rear  Coil Spring Replacement (All Wheel Drive)
COIL SPRING REPLACEMENT (ALL WHEEL DRIVE)
Coil Spring Replacement (All Wheel Drive)
Tools Required
J 41820 Ball Joint/Stud Separator
Removal Procedure
Raise and support the vehicle. Refer to Vehicle Lifting.
Remove the rear wheel.
Remove the brake caliper and support the bake caliper. Do not disconnect the brake hose.
Disconnect the tie rod from the knuckle.
Use a utility stand in order to support the lower control arm.
Disconnect the height sensor link from the lower control arm.
Disconnect the shock absorber from the lower control arm.
Use the J 41820 in order to disconnect the ball joint from the knuckle.
Remove the lower ball joint nut.
Use the utility stand in order to lower the control arm and relieve the coil spring tension.
Carefully remove the coil spring and jounce bumper (2).
Installation Procedure
Install the spring jounce bumper to the spring.
Index and install the spring insulator to the spring (2).
Index and install the spring seat with the spring and the jounce bumper to the lower control arm (1).
Use the utility stand in order to raise the lower control arm.
Install the lower ball joint to the knuckle.
Notice: Refer to Fastener Notice in Service Precautions.
Install the lower ball joint nut.
Tighten the lower ball joint nut to 85 Nm (63 ft. Lbs.).
Connect the shock absorber to the lower control arm.
Connect the height sensor link to the lower control arm.
Disconnect the tie rod from the knuckle.
Install the brake caliper.
Install the rear wheel.
Lower the vehicle.

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If you find the spring is not the issue, check the shock and shock mounts for damage, worn bushings.

Let me know what you find or if you have other questions.

Take care,
Joe