---
title: "Coolant Leak Detection Kit — $58K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/coolant-leak-detection-kit"
last_updated: "2026-08-10T16:33:47.232Z"
locale: en
meta:
description: "Niche score 36/100 · $58K/yr market · 37K searches/yr · $12.26 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 36/100 · $58K/yr market · 37K searches/yr · $12.26 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "Coolant Leak Detection Kit — $58K/yr Amazon US Niche (2026) - Flapen"
---
# **coolant leak detection kit**
**Skip it**
Brand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.
Market size 14Growth 15Conversion 95Competition 15Returns 79Price range 35Avg price 52Brand share 12Review moat 66Quality gap 28
**Conversion**
**Incredible****12.6%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Great****1.8%**
return rate — above 5% kills the launch gate
**Review moat**
**Good****874.1**
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**
**Okay****4.6★**
avg incumbent rating — lower means beatable quality
**Growth**
**Bad****-20.1%**
90-day search growth — must beat 0% to launch
**Competition**
**Bad****82%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****$58K**
$58K/yr · 37K searches
**Brand share**
**Bad****95%**
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 ~~](https://flapen.com/research/methodology)
## **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**
**42**
**Top-5 brand share**
**95%**
Top 20: 100%
**Top-5 click share**
**82%**
Top 20: 100%
**Open market**
**2%**
- 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.
1K800Spike '25Spike '26 seasonAprMayJunJulAugSepOctNovDecJanFebMarAprMayJun
No pronounced peak months · busiest ÷ quietest = 1.6×
[**Open Trend **](https://flapen.com/research/us/automotive/coolant-leak-detection-kit/trend)
## **Top coolant leak detection kit search terms**
- **coolant dye**10K/yr-17.1%11.4% conv. - **coolant uv dye**8K/yr-11.6%9.7% conv. - **uv dye for coolant leak**8K/yr-43.5%12.4% conv. - **coolant dye leak detection kit**4K/yr+7.6%12.7% conv. - **coolant leak dye**4K/yr-31.7%13.2% conv. - **uv coolant dye**3K/yr+4.1%14.7% conv. [**All search terms **](https://flapen.com/research/us/automotive/coolant-leak-detection-kit/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.
0%10%$6K20%$12K30%$17K40%$23K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
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
[1**TSI Supercool Synthetic U/V Leak Detection Dye 1 oz 1 Application**TSI Supercool**$6.56**4.5★551 rev](https://www.amazon.com/dp/B008PKV0TM) [2**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**$7.59**4.5★2,547 rev](https://www.amazon.com/dp/B002M4G24U) [3**TSI Supercool RD8 Radiator Coolant Water Based U/V Leak Detection Dye (Self Measure Bottle) Purple 8-Ounce Bottle**TSI Supercool**$18.88**4.5★551 rev](https://www.amazon.com/dp/B008PKWEHY) [4**ACDelco GM Original Equipment 10-5057 (12378563) Engine Cooling System Tracer Dye - 1 oz**ACDelco**$7.67**4.6★426 rev](https://www.amazon.com/dp/B008I2VOCA) [5**Certified A/C Pro Car Air Conditioner Leak Detector Dye Leak Detection UV Dye for Cars and Radiators 1 Oz InterDynamics**A/C Pro**$9.12**4.6★936 rev](https://www.amazon.com/dp/B002M4E0VC)
**~~View all top sellers →~~**
### **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**$16.09**17 rev7mo ago](https://www.amazon.com/dp/B0GCBNPNTC) [**Vansky Air Conditioner Leak Detector: Professional Car Tool 68 LED Automotive AC UV Dye Leak Detection Kit with Protective Glasses**Vansky**$18.14**627 rev2y ago](https://www.amazon.com/dp/B0CS6M7653) [**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**$19.59**2,570 rev5y ago](https://www.amazon.com/dp/B08DVBM9ZF) [**LEAKFINDER LF3001CS Automotive Engine Coolant Leak Detection Dye for Radiators Hoses Heater Cores Water Pumps 1oz Ultraviolet Fluorescent Dye Bottle Services 1 Vehicle**LEAKFINDER**$10.71**179 rev6y ago](https://www.amazon.com/dp/B07V7GS23R) [**TSI Supercool Synthetic U/V Leak Detection Dye 1 oz 1 Application**TSI Supercool**$6.56**551 rev13y ago](https://www.amazon.com/dp/B008PKV0TM)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**LEAKFINDER LF3001CS Automotive Engine Coolant Leak Detection Dye for Radiators Hoses Heater Cores Water Pumps 1oz Ultraviolet Fluorescent Dye Bottle Services 1 Vehicle**LEAKFINDER**$10.71**4.6★**▲ 175%**](https://www.amazon.com/dp/B07V7GS23R) [**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**$16.09**4.6★**▲ 87%**](https://www.amazon.com/dp/B0GCBNPNTC) [**TSI Supercool RD8 Radiator Coolant Water Based U/V Leak Detection Dye (Self Measure Bottle) Purple 8-Ounce Bottle**TSI Supercool**$18.88**4.5★**▲ 48%**](https://www.amazon.com/dp/B008PKWEHY) [**ACDelco 1149328 GM Original Equipment 10-5046 Dex-Cool Leak Detection Tracer Dye - 1 oz**ACDelco**$8.27**4.7★**▲ 46%**](https://www.amazon.com/dp/B008I2VKNI) [**Vansky Air Conditioner Leak Detector: Professional Car Tool 68 LED Automotive AC UV Dye Leak Detection Kit with Protective Glasses**Vansky**$18.14**4.6★**▲ 12%**](https://www.amazon.com/dp/B0CS6M7653)
**~~View all trending →~~**
## **What buyers say about coolant leak detection kit**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Leak-Proof**23%
*“Useful to chase down leak”*
**Advertised Vs Actual Product**12%
*“Works as advertised”*
**Value For Money**9%
*“Decent price works as it should”*
**Efficiency**8%
*“Works perfectly”*
**Ease Of Use**7%
*“Easy to use”*
**Quality-Overall**6%
*“Excellent product”*
**Brightness/Shine/Glow**6%
*“Bright light”*
**Color**5%
*“Color is nice”*
**Functionality-Overall**1%
*“The black light is working correctly”*
**Smell**1%
*“It doesn't have a strong odor so it is not caustic”*
### **What buyers complain about **
**Leak-Proof**38%
*“Car was leaking”*
**Brightness/Shine/Glow**7%
*“Flashlight does not stay on”*
**Color**4%
*“no dye found anywhere”*
**Quality-Overall**3%
*“Junk”*
**Functionality-Overall**3%
*“Did not work”*
**Durability**2%
*“Didn't last”*
**Natural Resource Wastage**2%
*“Waste of money”*
**Strength**2%
*“Too weak”*
**Ease Of Use**2%
*“It was a bit frustrating to use”*
**Coolant**1%
*“Did I fix my coolant issue with it? No”*
### **Top return reasons **
**Leak-Proof**20%
**Advertised Vs Actual Product**12%
**Color**10%
**Compatibility-Overall**10%
**Functionality-Overall**9%
**Brightness/Shine/Glow**9%
**Value For Money**5%
**Coolant**4%
**Size-Overall**3%
**Defective Material/Parts**3%
## **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.
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