If you run a Peterbilt 389 (or any of the classic Peterbilt workhorses in the 325–388 range), your door mirror isn’t just a “nice-to-have.” It’s a safety system, a productivity tool, and—when it’s worn out—a daily source of frustration. A loose arm, cloudy glass, dead power adjuster, or a heater that quit last winter can quietly turn every lane change into a gamble.
In this guide, we’ll break down exactly why a chrome heated power mirror assembly is one of the smartest, most practical upgrades you can make—especially for drivers who run early mornings, winter routes, fog, or heavy traffic. We’ll also show you how to confirm fitment, what to expect during installation, and how to keep that new mirror looking sharp and performing like OEM.
Featured product: Peterbilt 325–389 Door Mirror Assembly – Chrome Heated Power (LH Driver)
Why Peterbilt Owners Replace Door Mirrors So Often
Mirror assemblies live a hard life. They get hammered by vibration, slammed by wind at highway speed, clipped in tight docks, and exposed to rain, road salt, sun, and diesel grime. Over time, even a truck that’s maintained religiously can end up with mirror issues that become “normal”—until you finally swap the assembly and wonder why you waited.
- Vibration & looseness: A mirror that shakes at 55–70 mph forces your eyes to work harder and slows reaction time.
- Heater failure: Fogging and frost reduce visibility right when you need it most.
- Dead power adjustment: If the motor is weak or dead, you lose quick visibility corrections for load/seat changes.
- Corrosion & finish wear: Rusty hardware and peeling finishes look bad and can weaken mounting points.
- Cracked or hazy glass: Micro-cracks and scratches scatter headlights at night and reduce clarity.
The fix isn’t always just the glass. When the housing, heater, wiring, and power motor are tired, a full mirror assembly replacement restores stability, clarity, and confidence in one job.
What Makes a “Chrome Heated Power” Door Mirror Worth It?
Many drivers try to “get by” with a basic mirror, but there’s a reason so many Peterbilt owners choose a heated, motorized, chrome assembly: it directly improves day-to-day safety and comfort—especially in real-world conditions (cold mornings, rain, fog, mixed traffic).
1) Heated glass = clear visibility when weather turns ugly
A heated mirror helps keep the glass clear of frost and reduces fogging in cold or wet conditions. The result is less wiping, less guessing, and fewer risky moves. If you drive early starts, mountain routes, or winter lanes, working heat is a practical must-have.
2) Power adjustment = faster, safer corrections
With a motorized mirror, you can quickly dial in the angle after switching drivers, changing seat height, or hauling a different trailer. That matters when you’re trying to eliminate blind spots and get the best view of your lanes and trailer line.
3) Chrome cover + stainless housing = durability and a clean, premium look
Chrome isn’t just style—it’s also easier to keep looking clean with basic washing. Stainless housing adds strength and longevity, especially for trucks that live on the road year-round.
Product Spotlight: LH Driver Mirror Assembly for Peterbilt 325–389
This door mirror assembly is designed for driver-side (left) installation and built for Peterbilt owners who want a direct-fit upgrade with the features that matter: heated glass + motorized adjustment + chrome/stainless construction.
Shop the exact product here: High Soar Chrome Heated Motorized Door Mirror Assembly (Driver/Left)
Quick spec overview
| Side | Driver / Left (LH) |
| Key features | Motorized adjustment + heated glass |
| Finish / housing | Chrome cover / stainless steel housing |
| Mounting | Door mount (factory locations) |
| Fitment type | Vehicle-specific fit |
Fitment: Which Peterbilt Models Does This Mirror Fit?
Always confirm your exact truck configuration before ordering, especially with power/heated options. This mirror assembly is designed to fit the following Peterbilt models:
- Peterbilt 389
- Peterbilt 388
- Peterbilt 386
- Peterbilt 385
- Peterbilt 382
- Peterbilt 367
- Peterbilt 365
- Peterbilt 357
- Peterbilt 348
- Peterbilt 340
- Peterbilt 335
- Peterbilt 330
- Peterbilt 325
If your truck has power mirror functionality, this assembly is designed to plug into the existing system and mount to factory locations. If your current mirror is manual or your wiring setup differs, verify compatibility before ordering.
Want to browse more Peterbilt options? Start here: Peterbilt Mirror Truck Parts (covers heated mirrors, chrome mirrors, covers, brackets, glass, and more).
How to Confirm You’re Ordering the Correct Side (LH vs RH)
This is a left-hand (driver-side) mirror assembly. A simple rule: if you’re sitting in the driver’s seat, your left side is LH. But don’t rely on memory—use these checks:
- Compare to your existing mirror: match the shape, mounting points, and harness routing.
- Check your wiring connector: power/heated mirrors will typically have a harness connector; confirm plug style and pin count.
- Look for feature switches inside the cab: if you have a power mirror control, you likely need a power mirror assembly.
Installation Notes: What to Expect (and How to Avoid Headaches)
Mirror replacement is usually a straightforward job for a shop or a mechanically confident owner-operator. But mirrors are also one of those parts where small mistakes (rushing wiring, skipping test-fit) can cost time.
Best-practice installation tips
- Test-fit before final install: align the assembly and confirm mounting points before tightening everything down.
- Use OEM-style torque and hardware: correct fasteners reduce vibration and prevent stress cracking.
- Protect wiring: route harness away from pinch points and sharp edges.
- Function test: confirm power adjustment + heat (when applicable) before fully reassembling trim.
- Re-check after a few trips: vibration can settle hardware—re-tighten if needed.
If you’re also noticing weak mirror movement (slow or stuck adjustment), it may be the motor rather than the entire assembly. In that case, browse related components in the Peterbilt mirror section: Peterbilt Mirror Truck Parts.
Care & Maintenance: Keep Chrome Looking Sharp and Mirror Performance Strong
A chrome mirror can look incredible for years—if you clean it correctly. Harsh chemicals and abrasive pads can damage finishes and seals, while road salt can attack hardware and brackets.
- Wash with mild soap and water; avoid abrasive pads and strong solvents.
- Rinse thoroughly and dry around mounting points (especially in winter climates).
- Remove road salt regularly to prevent corrosion.
- Periodically check bracket tightness to reduce vibration and premature wear.
Why Buy Mirrors from ROADWEST Instead of Taking a Risk Elsewhere?
Mirrors are safety-critical parts. Fitment, finish quality, and packaging all matter. ROADWEST is built around a simple promise: verified fitment, no drop-shipping, and fast U.S. fulfillment.
- No drop-shipping: parts are stocked and inspected—so you’re not gambling on unknown sellers.
- Fitment-focused catalog: shop by make/model and mirror category for faster matching.
- Fast U.S. shipping: in-stock items ship quickly, and there’s a clear shipping/returns policy.
- 30-day returns: return or exchange unused parts within 30 days (subject to guidelines).
If you’re upgrading more than just mirrors, explore the full Peterbilt catalog: Peterbilt Truck Parts. It’s the easiest way to bundle upgrades (mirrors, lighting, accessories) and keep your rig looking clean and running safe.
FAQ: Peterbilt Heated Power Mirrors (What Drivers Ask Most)
Does this mirror fit my Peterbilt 389?
This assembly is designed to fit Peterbilt 389 and multiple related models (325–388 range). Confirm your truck’s power mirror setup and connector before ordering to ensure direct plug-in compatibility.
What’s the difference between “power” and “manual” mirrors?
Power mirrors use an internal motor so you can adjust mirror angle from inside the cab. Manual mirrors require you to physically move/adjust the mirror housing.
Will the heated function work automatically?
Heated mirror performance depends on your truck’s wiring and controls (some activate with a switch, others integrate with defrost systems). If your current mirror has heat and it works today, replacing with a heated mirror assembly typically maintains that function.
Should I replace the whole assembly or just the glass?
If the housing is stable and your problem is only cracked glass, you may only need replacement glass. But if you have vibration, motor problems, heater failure, or housing damage, a full assembly replacement is usually the best long-term fix.
Is chrome harder to maintain?
Not if you clean it correctly. Use mild soap and water, avoid abrasives, and remove road salt regularly. Done right, chrome can stay looking premium for years.
Final Take: A Mirror Upgrade That Improves Safety, Comfort, and Confidence
A reliable mirror assembly is one of those upgrades you feel immediately—less vibration, clearer visibility, safer lane changes, and fewer “I hope that’s clear” moments in fog or winter conditions.
If you’re ready to upgrade your driver-side mirror, start here: Peterbilt 325–389 Door Mirror Assembly – Chrome Heated Power (LH Driver)
Or browse more options in the mirror collection: Peterbilt Mirror Truck Parts and the full Peterbilt catalog: Peterbilt Truck Parts.
Keep your rig looking sharp, your visibility clean, and your uptime strong—mile after mile.