Automotive Β· π°π· Korea
Monsoon Car Check D-day
D-day to monsoon onset plus 8 self-check items (wipers, tires, A/C, battery, undercarriage, flood-prep) tailored to your car (model year, mileage, region).
About this tool
Monsoon Car Check D-day takes your car (model year, mileage, type β sedan / SUV / kei / EV), home metro region, parking environment (underground / street / near-basement), and last-service date, then auto-calculates the D-day to that region's long-term monsoon onset (Seoul metro Jun 25 / central Jun 19 / south Jun 23 / Jeju Jun 19) and rates 8 inspection items β wipers, tire tread (1.6mm limit), A/C cabin filter, battery, undercarriage wash, flood preparation, dashcam, in-car umbrella β as "service now," "watch," or "OK." Local flood-risk data from the Ministry of the Interior is mapped to your address and displayed as low / medium / high. Each item shows the why, a DIY tip, and a typical Korean repair-shop cost. There is also a one-page flood-emergency guide and exports for a result PNG (D-day prominent) and an ICS calendar. Everything runs in your browser; the car info never leaves the device. Pairs naturally with yeonbi (fuel economy) and cartax (auto tax) in the same Automotive hub for a one-pass June seasonal review.
Use cases
Scenario 1
D-37 β wipers + tires together
A 5-year-old car with 70k km at D-37 lights up both wipers (6β12-month rule) and tires (1.6mm limit) as "service now."
Scenario 2
Basement-adjacent parking β high flood risk
For Gangnam / Gangseo basement-adjacent parking, the "high" flood badge appears with a "move parking before monsoon" recommendation.
Scenario 3
Cabin A/C filter β proactive May change
If the cabin A/C filter is β₯1 year old, a "replace before late May" alert at D-30 makes sure it is done before the monsoon hits hard.
Scenario 4
EV underbody / HV battery check
EV mode adds HV battery underbody, undercarriage corrosion, and waterproof charge-cable inspection on top of the standard items.
Scenario 5
Share result card via KakaoTalk
Drop the D-day result card into a KakaoTalk group or office chat β a quick way to give family and coworkers a heads-up.
Features
- KMA long-term monsoon onset by region β auto D-day
- 8 self-check items rated as Service-now / Watch / OK
- Rules tailored to model year, mileage, type (incl. EV)
- Ministry of Interior flood-zone mapping (low / med / high)
- Per-item rationale + DIY tip + typical Korean repair-shop cost
- One-page flood-emergency guide
- Result PNG card + ICS calendar export
- Fully in-browser; car info never reaches a server
WHEN TO USE
When to use this tool
Monsoon Car Check D-day is most useful in the situations below. If your case doesn't fit, check the "Related tools" or "Other tools in this hub" sections at the bottom of the page.
Case 1 Β· D-37 β wipers + tires together
A 5-year-old car with 70k km at D-37 lights up both wipers (6β12-month rule) and tires (1.6mm limit) as "service now."
Case 2 Β· Basement-adjacent parking β high flood risk
For Gangnam / Gangseo basement-adjacent parking, the "high" flood badge appears with a "move parking before monsoon" recommendation.
Case 3 Β· Cabin A/C filter β proactive May change
If the cabin A/C filter is β₯1 year old, a "replace before late May" alert at D-30 makes sure it is done before the monsoon hits hard.
Other tools in this hub
These hub-mates pair well with this tool. The scenarios differ slightly β compare them side by side.
- π Korean Car Tax Calculatorβ Calculate annual Korean car tax with education surcharge, age discount, and yearly pre-payment discount.
- π Korean Car Acquisition Tax Calculatorβ Korean car acquisition tax: 7% rate, education surcharge, local bond, EV discount.
Tool-specific FAQ
Frequently asked
- Q. How is monsoon onset decided?
- A. Defaults to KMA long-term means (Seoul metro Jun 25, central Jun 19, south Jun 23, Jeju Jun 19) and switches to the current-season forecast as soon as KMA publishes it.
- Q. When should I replace wipers?
- A. Standard cycle is 6β12 months. Enter the last replacement date and the tool flags it as Service-now / Watch / OK at the current D-day. Replace immediately if you hear chatter or see streaks during rain.
- Q. What is the legal tire-tread limit?
- A. Korean law sets the limit at 1.6mm, but wet braking degrades sharply once you drop below ~4mm. The tool estimates wear from mileage and age and warns at both 4mm and 1.6mm thresholds.
- Q. Where does the flood-zone data come from?
- A. Estimated from the Ministry of the Interior's public flood-trace dataset and metro-level history mapped to your address. Verify exact risk on safekorea.go.kr.
- Q. What if my car gets flooded?
- A. Do not start the engine β call a tow truck and immediately check your insurer about own-vehicle-damage coverage. The built-in 1-page flood guide walks through the four-step protocol.
- Q. Is it useful outside monsoon season?
- A. Future seasonal cards (heatwave in August, winter prep in November) will follow the same format. The current version is tuned for the JuneβJuly monsoon β outside that window, pair with yeonbi (fuel economy) and cartax (auto tax).
Sources / references
Related guides / blog posts
Long-form posts in the Automotive hub or sharing the same tags. Skim one before or after using the tool to make the result easier to interpret.
π Guide
5 Legal Ways to Save on Korean Car Tax (2026)
Annual prepay, EV exemption, light-car cap, timing split, and vehicle swap β five legal ways to cut Korean car tax in 2026.
π Blog
Korean Driver-License Renewal 2026 β Aptitude Test, Fees, and Online Filing
A one-page reference: renewal cycle by license class, aptitude-test thresholds, and how to file via the KOROAD safe-driving portal.
Related tools
π°π· Korea
Korean Car Tax Calculator
Calculate annual Korean car tax with education surcharge, age discount, and yearly pre-payment discount.
- Per-cc rate
- Jan 9.15% discount
- Age discount
π°π· Korea
Korean Car Acquisition Tax Calculator
Korean car acquisition tax: 7% rate, education surcharge, local bond, EV discount.
- Acquisition tax
- Local bond
- EV discount
How we run it / disclaimer
This tool is advisory and does not constitute legal, tax, medical, or financial advice. All calculations and document generation run in your browser; inputs are never sent to a server. Ads follow Google AdSense policy and are kept separate from tool accuracy.