---
title: "Radiator Flush — $287K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/automotive/radiator-flush"
last_updated: "2026-08-07T00:19:31.299Z"
locale: en
meta:
description: "Niche score 50/100 · $287K/yr market · 177K searches/yr · $21.11 avg price. Soft demand (-9.8% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:description": "Niche score 50/100 · $287K/yr market · 177K searches/yr · $21.11 avg price. Soft demand (-9.8% this quarter) keeps it on the watch list. Data updated Jul 2026."
"og:title": "Radiator Flush — $287K/yr Amazon US Niche (2026) - Flapen"
---
# **radiator flush**
**Worth a look**
Shows a sweet-spot price point ($21.11 avg), but soft demand (-9.8% this quarter) keeps it on the watch list.
Market size 51Growth 20Conversion 78Competition 25Returns 77Price range 87Avg price 90Brand share 37Review moat 74Quality gap 43
**Avg price**
**Great****$21.11**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$5.82–$92.76**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Conversion**
**Great****7.7%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Great****1.9%**
return rate — above 5% kills the launch gate
**Review moat**
**Good****545.13**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Good****$287K**
$287K/yr · 177K searches
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****83%**
top-5 brand share — brands hold most of the demand
**Competition**
**Bad****70%**
top-5 click share — a locked-up shelf
**Growth**
**Bad****-9.8%**
90-day search growth — must beat 0% to launch
According to Flapen's Amazon United States niche tracking, radiator flush is a $287K/yr Amazon United States market (177K searches/yr). The top 5 brands hold 83% of demand. Verdict: Worth a look — 50/100.
Data updated Jul 9, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **radiator flush market data**
- **Units sold / yr**
- **10K–13K**
- avg 500–750/product
- **Revenue / yr**
- **$211K–$264K**
- units × avg price
- **Conversion rate**
- **7.7%**
- **Avg BSR**
- **#69**
- **Page quality**
- **0%**
- **Prime**
- **100%**
- **Sponsored**
- **69%**
- **Out of stock**
- **2.7%**
- **Avg brand age**
- **78 months**
- **Avg seller age**
- **162 days**
## **Competition & brand share**
The top 5 products capture 70% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**12 **▲rising
**Sellers**
**73**
**Top-5 brand share**
**83%**
Top 20: 100%
**Top-5 click share**
**70%**
Top 20: 100%
**Open market**
**12%**
- Prestone36% - BlueDevil Products19% - CRC19% - Gunk5% - Design Engineering5% - IRONTITE5% - Open — no brand owns it (6 brands, 12%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — -9.8% search growth over the last 90 days.
5K4KSpike '25 seasonSepDecMarJunAugNovMarMay
No pronounced peak months · busiest ÷ quietest = 1.3×
[**Open Trend **](https://flapen.com/research/us/automotive/radiator-flush/trend)
## **Top radiator flush search terms**
- **radiator flush**83K/yr-5.1%7.2% conv. - **coolant flush**41K/yr-12.1%4.8% conv. - **radiator flush and cleaner**16K/yr-16.1%6.6% conv. - **cooling system flush**6K/yr-11.4%5.8% conv. - **thermocure**5K/yr-1.5%17.3% conv. - **cooling system cleaner**4K/yr-10.8%4.9% conv. - **coolant cleaner**4K/yr-2.0%5.3% conv. - **coolant flush cleaner**5K/yr-31.9%6.5% conv. - **coolant system flush**4K/yr-19.9%7.0% conv. - **thermocure radiator flush**4K/yr-33.0%17.8% conv. [**All search terms **](https://flapen.com/research/us/automotive/radiator-flush/search-terms)
## **Top radiator flush 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%$29K20%$57K30%$86K40%$115K1101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 16 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Prestone AS105 Total Cooling System Cleaner for Radiator Heater Core and Hoses 22 oz. 1 pack**Prestone**$13.85**4.6★2,360 rev](https://www.amazon.com/dp/B00B99U088) [2**CRC Thermocure Coolant System Rust Remover 32 Oz Rust Remover for Vehicle Cooling Systems Removes Rust Scale and Deposits**CRC**$26.14**4.6★1,572 rev](https://www.amazon.com/dp/B00R74I5UY) [3**Prestone Products Corp Radiator Flush/Cleaner AS105R**Prestone**$5.82**4.7★181 rev](https://www.amazon.com/dp/B0CW22JSGV) [4**BlueDevil 3 in 1 Radiator Flush | Automotive Oil Degreaser Radiator Flush Rust Remover | 32 oz. | Multi-Vehicle Formula**BlueDevil Products**$12.82**4.5★587 rev](https://www.amazon.com/dp/B09134729D) [5**DEI Radiator Relief Cooling System Flush Improves Cooling Performance 16 oz**Design Engineering**$11.78**4.2★42 rev](https://www.amazon.com/dp/B000NV1PBY)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**LURKA Coolant System Flush Gun Lever Action Heater Core Flush Kit with 3/4 & 1/2 Garden Hose Adapters/Shut-Off Valve Air & Water Combo Radiator Flusher Nozzles for 5 Sizes of Hoses (19-40mm)**LURKA**$27.03**6 rev5mo ago](https://www.amazon.com/dp/B0GLYRLVDR) [**QUFYSK Coolant Flush Gun Lever Action Heater Core Flush Kit Coolant Flush Kit for Automotive Coolant Flush Air and Water Radiator Flush Kit with Nozzles for 19-40mm Hoses**QUFYSK**$29.81**27 rev6mo ago](https://www.amazon.com/dp/B0G7WK4J64) [**ERRECOM Zeus+ Cleaner for Radiators and Cooling Systems 12 fl oz Bottle (350 mL)**ERRECOM**$11.93**151 rev7mo ago](https://www.amazon.com/dp/B0CRZCQD77) [**BlueDevil Radiator Flush 32 oz | Deep Cleaning Coolant System Flush | Removes Rust Scale & Grime**BlueDevil Products**$92.76**587 rev1y ago](https://www.amazon.com/dp/B0DPXTK8NS) [**BILITOOLS Coolant Funnel Kit Automotive Radiator Coolant Filling Tool**BILITOOLS**$18.32**58 rev1y ago](https://www.amazon.com/dp/B0DP28XFBN)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**BILITOOLS Coolant Funnel Kit Automotive Radiator Coolant Filling Tool**BILITOOLS**$18.32**4.5★**▲ 256%**](https://www.amazon.com/dp/B0DP28XFBN) [**LURKA Coolant System Flush Gun Lever Action Heater Core Flush Kit with 3/4 & 1/2 Garden Hose Adapters/Shut-Off Valve Air & Water Combo Radiator Flusher Nozzles for 5 Sizes of Hoses (19-40mm)**LURKA**$27.03**4.5★**▲ 249%**](https://www.amazon.com/dp/B0GLYRLVDR) [**ERRECOM Zeus+ Cleaner for Radiators and Cooling Systems 12 fl oz Bottle (350 mL)**ERRECOM**$11.93**4.4★**▲ 206%**](https://www.amazon.com/dp/B0CRZCQD77) [**QUFYSK Coolant Flush Gun Lever Action Heater Core Flush Kit Coolant Flush Kit for Automotive Coolant Flush Air and Water Radiator Flush Kit with Nozzles for 19-40mm Hoses**QUFYSK**$29.81**4.7★**▲ 110%**](https://www.amazon.com/dp/B0G7WK4J64) [**Prestone Products Corp Radiator Flush/Cleaner AS105R**Prestone**$5.82**4.7★**▲ 96%**](https://www.amazon.com/dp/B0CW22JSGV)
**~~View all trending →~~**
## **What buyers say about radiator flush**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**18%
*“Solid quality”*
**Efficiency**14%
*“Working good”*
**Value For Money**11%
*“Good price”*
**Ease Of Use**9%
*“Easy to use”*
**Advertised Vs Actual Product**9%
*“Works as it should”*
**Coolant**6%
*“No spills, easy adding, no more bubble over from burping your coolant system”*
**Ease Of Cleaning**5%
*“Cleans as it should”*
**Leak-Proof**3%
*“Doesn't leak”*
**Durability**2%
*“But it really seemed to break things up nicely”*
**Heating**2%
*“This coolant flush gun made back flushing my heater core a piece of cake”*
### **What buyers complain about **
**Leak-Proof**18%
*“not sure how much leaked out”*
**Compatibility-Overall**11%
*“Adapters would not fit my Toyota or Honda”*
**Quality-Overall**9%
*“Absolutely trash in every”*
**Rusts/Corrodes**9%
*“it quickly became contaminated with rust also”*
**Heating**6%
*“Engine would overheat after running about 5 miles”*
**Coolant**3%
*“Its the only way I was able to get all air out of my cooling system on my 7th generation honda civic”*
**Instructions/User Manual/Troubleshooting**2%
*“It doesn't come with a manual”*
**Water Resistance**2%
*“The water was really nasty”*
**Pressure**1%
*“The only downside to that was no air pressure”*
**Color**1%
*“deep red that is difficult to see when it is fully dissolved”*
### **Top return reasons **
**Coolant**20%
**Size-Overall**16%
**Compatibility-Overall**15%
**Advertised Vs Actual Product**12%
**Leak-Proof**7%
**Defective Material/Parts**5%
**Value For Money**5%
**Functionality-Overall**4%
**Rusts/Corrodes**3%
**Instructions/User Manual/Troubleshooting**2%
## **Common questions**
- **Is radiator flush profitable to sell on Amazon United States?**
- The niche generates $287K/yr across 16 tracked products. 1 of 3 products launched in the last 360 days are still selling. 90-day search growth is -9.8%. Flapen's verdict: Worth a look (50/100).
- **How competitive is the radiator flush niche?**
- 12 brands and 73 sellers compete. The top 5 products take 70% of clicks and top 5 brands hold 83% of demand.
- **What do buyers complain about in radiator flush?**
- Top complaints mined from reviews: Leak-Proof, Compatibility-Overall, Quality-Overall. The return rate is 1.9%.
- **When does demand for radiator flush peak?**
- Demand is steady year-round — the busiest month runs 1.3× the quietest.
- **What does it cost to enter the radiator flush niche?**
- Listings span $5.82–$92.76; the average listing price is $21.11 (sweet spot $15–$100). The average incumbent carries 545 reviews — the moat a new listing must climb.
## **Related niches in Automotive**
- 72 [**brake bleeder kit**](https://flapen.com/research/us/automotive/brake-bleeder-kit)$2.2M/yr+8.2%**Launch it**- 72 [**gas can pump**](https://flapen.com/research/us/automotive/gas-can-pump)$1.7M/yr+20.1%**Launch it**- 72 [**dewalt hedge trimmer**](https://flapen.com/research/us/automotive/dewalt-hedge-trimmer)$1.6M/yr+158.2%**Launch it**- 72 [**iron eraser**](https://flapen.com/research/us/automotive/iron-eraser)$107K/yr>1,000%**Worth a look**- 72 [**marine fuel line**](https://flapen.com/research/us/automotive/marine-fuel-line)$198K/yr+104.3%**Worth a look**- 72 [**garden hose filter**](https://flapen.com/research/us/automotive/garden-hose-filter)$729K/yr+110.7%**Worth a look**[**All Automotive niches **](https://flapen.com/research/us/automotive)