Is coolant leak detection kit profitable to sell on Amazon United States?

The niche generates $58K/yr across 10 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -20.1%. Flapen's verdict: Skip it (36/100).

How competitive is the coolant leak detection kit niche?

7 brands and 42 sellers compete. The top 5 products take 82% of clicks and top 5 brands hold 95% of demand.

What do buyers complain about in coolant leak detection kit?

Top complaints mined from reviews: Leak-Proof, Brightness/Shine/Glow, Color. The return rate is 1.8%.

When does demand for coolant leak detection kit peak?

Demand is steady year-round — the busiest month runs 1.6× the quietest.

What does it cost to enter the coolant leak detection kit niche?

Listings span $6.56–$19.59; the average listing price is $12.26 (sweet spot $15–$100). The average incumbent carries 874 reviews — the moat a new listing must climb.

coolant leak detection kit

Skip it

Brand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.

Conversion

Incredible12.6%

search→purchase rate — share of searches ending in a sale

Returns

Great1.8%

return rate — above 5% kills the launch gate

Review moat

Good874.1

avg incumbent reviews — the moat a new listing must climb

Avg price

Good$12.26

avg listing price — sweet spot $15–$100

Price range

Okay$6.56–$19.59

cheapest to priciest tracked listing — scored on the share inside $15–$100

Quality gap

Okay4.6★

avg incumbent rating — lower means beatable quality

Growth

Bad-20.1%

90-day search growth — must beat 0% to launch

Competition

Bad82%

top-5 click share — a locked-up shelf

Market size

Bad$58K

$58K/yr · 37K searches

Brand share

Bad95%

top-5 brand share — brand-locked demand

According to Flapen's Amazon United States niche tracking, coolant leak detection kit is a $58K/yr Amazon United States market (37K searches/yr). The top 5 brands hold 95% of demand. Verdict: Skip it — 36/100.

Data updated Jul 9, 2026 · scored weekly · How we score niches

coolant leak detection kit market data

Units sold / yr: 5K–6K; avg 500–750/product
Revenue / yr: $61K–$74K; units × avg price
Conversion rate: 12.6%
Avg BSR: #85
Page quality: 0%
Prime: 100%
Sponsored: 90%
Out of stock: 3.9%
Avg brand age: 90 months
Avg seller age: 183 days

Competition & brand share

The top 5 products capture 82% of clicks — a locked-up shelf that new listings rarely crack.

Brands

7 flat

Sellers

Top-5 brand share

95%

Top 20: 100%

Top-5 click share

82%

Top 20: 100%

Open market

TSI Supercool51%
A/C Pro23%
ACDelco12%
LEAKFINDER6%
Yesibeike4%
Vansky3%
Open — no brand owns it (1 brand, 2%)

Demand & seasonality

Weekly Amazon search volume, last 67 weeks — -20.1% search growth over the last 90 days.

No pronounced peak months · busiest ÷ quietest = 1.6×

Open Trend

Top coolant leak detection kit search terms

coolant dye10K/yr -17.1%11.4% conv.
coolant uv dye8K/yr -11.6%9.7% conv.
uv dye for coolant leak8K/yr -43.5%12.4% conv.
coolant dye leak detection kit4K/yr +7.6%12.7% conv.
coolant leak dye4K/yr -31.7%13.2% conv.
uv coolant dye3K/yr +4.1%14.7% conv.

All search terms

Top coolant leak detection kit products on Amazon

Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.

Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

All 10 tracked products in this niche — three views at once, no toggling.

Top sellers

by 90-day click share

TSI Supercool Synthetic U/V Leak Detection Dye 1 oz 1 Application

TSI Supercool$6.564.5★551 rev

A/C Pro Certified Auto Pro Oil and Fuel System UV Dye Leak Detection for Cars & Trucks & More 1 Oz 374CS Universal

A/C Pro$7.594.5★2,547 rev

TSI Supercool RD8 Radiator Coolant Water Based U/V Leak Detection Dye (Self Measure Bottle) Purple 8-Ounce Bottle

TSI Supercool$18.884.5★551 rev

ACDelco GM Original Equipment 10-5057 (12378563) Engine Cooling System Tracer Dye - 1 oz

ACDelco$7.674.6★426 rev

Certified A/C Pro Car Air Conditioner Leak Detector Dye Leak Detection UV Dye for Cars and Radiators 1 Oz InterDynamics

A/C Pro$9.124.6★936 rev

Newest

by launch date

Yesibeike Automotive UV Leak Detector Dye Kit 150ml High Visibility Tracer for Radiator Coolant Systems Hose Heater Core Water Pump and AC Includes Dye Cleaner and Gloves

Yesibeike$16.0917 rev

7mo ago

Vansky Air Conditioner Leak Detector: Professional Car Tool 68 LED Automotive AC UV Dye Leak Detection Kit with Protective Glasses

Vansky$18.14627 rev

2y ago

REALHUNLEE Air Conditioner UV Dye Leak Detector Pro Auto Oil AC UV Dye Leak Test Detection Tool Kit 68 LED A/C UV Flashlight Detector with Protective Glasses

REALHUNLEE$19.592,570 rev

5y ago

LEAKFINDER LF3001CS Automotive Engine Coolant Leak Detection Dye for Radiators Hoses Heater Cores Water Pumps 1oz Ultraviolet Fluorescent Dye Bottle Services 1 Vehicle

LEAKFINDER$10.71179 rev

6y ago

TSI Supercool Synthetic U/V Leak Detection Dye 1 oz 1 Application

TSI Supercool$6.56551 rev

13y ago

What buyers say about coolant leak detection kit

What buyers praise and complain about, mined from review topics.

What buyers love

Leak-Proof23%

“Useful to chase down leak”

Advertised Vs Actual Product12%

“Works as advertised”

Value For Money9%

“Decent price works as it should”

Efficiency8%

“Works perfectly”

Ease Of Use7%

“Easy to use”

Quality-Overall6%

“Excellent product”

Brightness/Shine/Glow6%

“Bright light”

Color5%

“Color is nice”

Functionality-Overall1%

“The black light is working correctly”

Smell1%

“It doesn't have a strong odor so it is not caustic”

What buyers complain about

Leak-Proof38%

“Car was leaking”

Brightness/Shine/Glow7%

“Flashlight does not stay on”

Color4%

“no dye found anywhere”

Quality-Overall3%

“Junk”

Functionality-Overall3%

“Did not work”

Durability2%

“Didn't last”

Natural Resource Wastage2%

“Waste of money”

Strength2%

“Too weak”

Ease Of Use2%

“It was a bit frustrating to use”

Coolant1%

“Did I fix my coolant issue with it? No”

Top return reasons

Leak-Proof20%

Advertised Vs Actual Product12%

Color10%

Compatibility-Overall10%

Functionality-Overall9%

Brightness/Shine/Glow9%

Value For Money5%

Coolant4%

Size-Overall3%

Defective Material/Parts3%

Common questions

Is coolant leak detection kit profitable to sell on Amazon United States?: The niche generates $58K/yr across 10 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is -20.1%. Flapen's verdict: Skip it (36/100).
How competitive is the coolant leak detection kit niche?: 7 brands and 42 sellers compete. The top 5 products take 82% of clicks and top 5 brands hold 95% of demand.
What do buyers complain about in coolant leak detection kit?: Top complaints mined from reviews: Leak-Proof, Brightness/Shine/Glow, Color. The return rate is 1.8%.
When does demand for coolant leak detection kit peak?: Demand is steady year-round — the busiest month runs 1.6× the quietest.
What does it cost to enter the coolant leak detection kit niche?: Listings span $6.56–$19.59; the average listing price is $12.26 (sweet spot $15–$100). The average incumbent carries 874 reviews — the moat a new listing must climb.