Rattle/clunk front end of a 2001 grand caravan

you have over heated the engine and the noise may be from ring failure . It may be from detonation from the fuel detonation from an extremely hot chamber. Have a compression test done to determine internal damage _--gasket and cracked head--. Have the coolant system pressure tested to check for leakage

this might help:
Here is the Technical Service Bulletin that maybe of help, worth looking into but can't guarantee that it would fix your problem Steering - Steering Column Clunking When Turning TECHNICAL Bulletin No.: 01-02-32-001P Date: November 25, 2009 Subject: Clunk Felt/Noise Heard From Steering Column, Steering Gear and/or Front Of Vehicle During Turning Maneuver and/or Steering Wheel Rotation (Replace Intermediate Shaft As Directed) Models: 2001-2004 Buick Regal 2005-2008 Buick Allure (Canada Only), LaCrosse 2000-2008 Chevrolet Impala 2000-2007 Chevrolet Monte Carlo 1998-2002 Oldsmobile Intrigue 2004-2007 Pontiac Grand Prix Supercede: This bulletin is being revised to add the 2008 Buick LaCrosse/Allure. Please discard Corporate Bulletin Number 01-02-32-001O (Section 02 - Steering). Condition Some customers may comment on a clunk type noise coming from the front of the vehicle while driving during a turning maneuver.
1. Locate a large area (parking lot) where the vehicle can be turned in a tight circle. 2. Turn the steering wheel to the right and/or left all the way to the steering lock, then off the steering lock a 1/4 turn. 3. Drive the vehicle approximately 5 km/h (3 mph) in a circle, preferably over rough pavement or seams on the road surface. 4. Drive the vehicle straight ahead at idle speed while applying and releasing the brake pedal. Listen/feel the steering wheel for the clunk/noise condition. 5. If a clunk is felt in the steering wheel, the MOST likely cause is the I-shaft - not the steering gear. Continue with the correction. Correction DO THIS - Replace the intermediate shaft DON'T DO THIS - DO NOT lube the intermediate shaft Replace the existing intermediate shaft

Check the sensor on the catalytic convertor may need to be tightened.

sounds like worn out shocks or struts

Have front struts checked, have a friend bounce vehicle up and down while you listen down beside the both front wheels. You might be able to find source of noise.

bal joints and tie rod ends

very common problem is the sway bay end links that attach to the strut from the sway bar. They sound like a light chuckling knock over bumps. The bushings that hold the subframe up wear or the bolts loosed due to the bushings wearing. usually the rear ones The bushings are 2 piece ,upper and lower Tighten with 18mm socket

This sounds like the anti-rattle springs where left out of the brake calipers.

450-$60 per upper strut mount at autozone, and probably 1hr. to 1-1/2 hrs.per side to replace it. Depending on your labor rate in your area. Would recommend alignment after too. Usually if your going to do one, do the other too, because it won't be too far behind the first one to clunk, and then you end up paying for another alignment too. Here's a site that may help, if not exactly what your getting done, pick closest for rough estimate, just add, or subtract parts/labor your not, or are getting done. ( repairpal.com )

Ball joint , front shocks , Steering arm bush.