The 2001 Park Avenue on GM's G-body platform is a comfortable cruiser with two major Achilles heels: the 3800 Series II engine's lower intake manifold gasket failure and transmission cooler line/radiator end tank corrosion leading to catastrophic transmission damage from coolant contamination.
Lower Intake Manifold Gasket Failure (3.8L V6)
Common · high severity
Typical onset: 60,000-120,000 mi
Symptoms: Coolant loss with no visible external leaks, White residue or 'milkshake' in oil cap area, Rough idle when cold, smooths out when warm, Coolant smell from exhaust, possible misfire codes
Fix: Replace lower intake manifold gaskets (use Fel-Pro 1200 or better, NOT Dex-Cool compatible OEM paper gaskets). Must remove upper plenum, fuel rails, ignition assembly. Strongly recommend doing valve cover gaskets, spark plugs, and coolant flush simultaneously. 6-8 hours labor for competent tech.
Estimated cost: $800-1,400
Transmission Oil Cooler Line Failure / Radiator End Tank Corrosion
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Pink or strawberry milkshake appearance in transmission fluid, Transmission slipping, delayed engagement, or complete failure, Coolant level dropping, transmission fluid level rising, Radiator leaking from plastic end tanks at cooler line connections
Fix: The radiator's integral transmission cooler develops pinhole leaks allowing coolant into ATF, destroying the 4T65-E transmission. Requires radiator replacement with external auxiliary cooler installation, complete transmission fluid flush (often too late), or full transmission rebuild/replacement if contamination occurred. Prevention: replace radiator proactively at 100k and add external cooler. Trans rebuild: 12-16 hours.
Symptoms: Whining or grinding noise from front of engine that increases with RPM, Supercharger oil leaking from front seal, Loss of boost pressure, reduced performance, Check engine light with fuel trim codes
Fix: The Eaton M90 supercharger's input coupler and front bearing wear out. Requires removing supercharger, replacing coupler, front bearing, and seals. Many shops replace entire rebuilt supercharger unit ($800-1,200 part). 4-6 hours labor. Also inspect serpentine belt tensioner and idler pulleys during this job.
Estimated cost: $1,200-2,000
Engine Mount Failure (Transmission Mount Most Common)
Common · medium severity
Typical onset: 70,000-130,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive engine movement visible when accelerating/braking, Vibration felt through steering wheel and floorboard at idle, Driveline shudder on acceleration
Fix: Hydraulic transmission mount collapses, causing powertrain to sag and shift violently. Right engine mount also prone to failure. Replace both transmission and right engine mounts as a pair. 2-3 hours labor total. Inspect front lower cradle for cracks while underneath.
Estimated cost: $350-600
Window Regulator Failure
Common · low severity
Typical onset: Not mileage-specific, age-related
Symptoms: Window drops into door, won't stay up, Grinding or clicking noise when operating window switch, Window moves slowly or unevenly, Window stuck in down position
Fix: Plastic regulator clips and gears break, especially driver's door. Requires door panel removal and regulator replacement (comes as complete assembly with motor). 1.5-2 hours per door. Front windows fail more than rears.
Estimated cost: $250-400
Front Strut Mount Bearing Failure
Occasional · medium severity
Typical onset: 80,000-140,000 mi
Symptoms: Clunking or popping noise over bumps, especially when turning, Steering feels notchy or catches when turning from center, Rattling from front suspension on rough roads, Uneven tire wear on front tires
Fix: Upper strut mount bearings wear out, causing noise and poor steering feel. Replace strut mount assemblies; recommend doing both sides with struts if originals (struts typically need replacement by 100k). 3-4 hours for mount-only replacement, 4-5 hours if doing complete strut assemblies with alignment.
Estimated cost: $400-800
Owner tips
Replace the radiator and install an external transmission cooler BEFORE the internal cooler fails — this $400 preventive job can save you a $3,000 transmission
Use only Dex-Cool coolant and change every 3 years; mixing coolant types accelerates intake gasket failure
On supercharged models, change supercharger oil every 30,000 miles with GM Supercharger Oil or synthetic 5W-30
These cars are sensitive to battery condition — weak battery causes bizarre electrical gremlins; replace at first sign of slow cranking
Buy the naturally aspirated base model if you find one with documented lower intake gasket replacement and a new radiator with external trans cooler; avoid high-mileage Ultras unless you enjoy expensive supercharger repairs.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Side post terminals standard on GM vehicles; higher CCA recommended for supercharged engine
As an Amazon Associate, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Every control module on the 1997-2005 Buick Park Avenue — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
⚠️ Optional; stores two driver positions; mirror memory integrated
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
ON CERTAIN PASSENGER VEHICLES, THE EMERGENCY TRUNK RELEASE HANDLE MAY BE INSTALLED OR FORCED OUT OF THE PROPER POSITION.
Consequence: IF THE CABLE IS OUT OF THE PROPER POSITION, IT COULD INCREASE THE FORCE REQUIRED TO ACTIVATE THE EMERGENCY TRUNK RELEASE HANDLE AND A PERSON TRAPPED IN THE TRUNK MAY NOT BE ABLE TO RELEASE THE TRUNK LATCH USING THE EMERGENCY TRUNK RELEASE HANDLE.
Remedy: DEALERS WILL SECURE THE EMERGENCY TRUNK RELEASE CABLE TO ENSURE THAT THE EMERGENCY TRUNK RELEASE HANDLE OPERATES PROPERLY. OWNER NOTIFICATION BEGAN DECEMBER 19, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT BUICK AT 1-800-521-7300.
VISIBILITY:WINDSHIELD WIPER/WASHER · 00V346000
2000-10-30
VEHICLE DESCRIPTION: PASSENGER VEHICLES. SOME OF THESE VEHICLES FAIL TO COMPLY WITH REQUIREMENTS OF FMVSS NO. 104, "WINDSHIELD WIPING AND WASHING SYSTEMS." THESE VEHICLES HAVE A WIPER SYSTEM MICROPROCESSOR THAT IS SUSCEPTIBLE TO VOLTAGE TRANSIENTS, WHICH CAN CAUSE A "LATCH-UP" CONDITION IN THE SYSTEM CONTROLLER.
Consequence: IF MICROPROCESSOR "LATCH-UP" OCCURS, THE CUSTOMER WILL NOT BE ABLE TO OPERATE THE SYSTEM IN BOTH THE LOWER AND HIGH-SPEED MODES REQUIRED BY THE STANDARD.
Remedy: DEALERS WILL REPLACE THE WINDSHIELD WIPER MOTOR COVER WHICH CONTAINS THE MICROPROCESSOR.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2001 Buick Park Avenue 3.8L Supercharged V6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.