radiator flush
Worth a lookShows a sweet-spot price point ($21.11 avg), but soft demand (-9.8% this quarter) keeps it on the watch list.
Avg price
Great$21.11avg listing price — sweet spot $15–$100
Price range
Great$5.82–$92.76cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great7.7%search→purchase rate — share of searches ending in a sale
Returns
Great1.9%return rate — above 6% kills the launch gate
Review moat
Good545.13avg incumbent reviews — the moat a new listing must climb
Market size
Good$287K$287K/yr · 177K searches
Quality gap
Okay4.5★avg incumbent rating — lower means beatable quality
Brand share
Okay83%top-5 brand share — brands hold most of the demand
Competition
Bad70%top-5 click share — a locked-up shelf
Growth
Bad-9.8%90-day search growth — must beat 0% to launch
Competition
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%
Open market
12%
- Prestone36%
- BlueDevil Products19%
- CRC19%
- Gunk5%
- Design Engineering5%
- IRONTITE5%
- Open — no brand owns it (6 brands, 12%)
Product shelf
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 16 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Prestone AS105 Total Cooling System Cleaner for Radiator Heater Core and Hoses 22 oz. 1 pack
Prestone$13.854.6★2,360 rev
CRC Thermocure Coolant System Rust Remover 32 Oz Rust Remover for Vehicle Cooling Systems Removes Rust Scale and Deposits
CRC$26.144.6★1,572 rev
Prestone Products Corp Radiator Flush/Cleaner AS105R
Prestone$5.824.7★181 rev
BlueDevil 3 in 1 Radiator Flush | Automotive Oil Degreaser Radiator Flush Rust Remover | 32 oz. | Multi-Vehicle Formula
BlueDevil Products$12.824.5★587 rev
DEI Radiator Relief Cooling System Flush Improves Cooling Performance 16 oz
Design Engineering$11.784.2★42 rev
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$27.036 rev
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$29.8127 rev
ERRECOM Zeus+ Cleaner for Radiators and Cooling Systems 12 fl oz Bottle (350 mL)
ERRECOM$11.93151 rev
BlueDevil Radiator Flush 32 oz | Deep Cleaning Coolant System Flush | Removes Rust Scale & Grime
BlueDevil Products$92.76587 rev
BILITOOLS Coolant Funnel Kit Automotive Radiator Coolant Filling Tool
BILITOOLS$18.3258 rev
Trending
90-day click momentumBILITOOLS Coolant Funnel Kit Automotive Radiator Coolant Filling Tool
BILITOOLS$18.324.5★
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$27.034.5★
ERRECOM Zeus+ Cleaner for Radiators and Cooling Systems 12 fl oz Bottle (350 mL)
ERRECOM$11.934.4★
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$29.814.7★
Prestone Products Corp Radiator Flush/Cleaner AS105R
Prestone$5.824.7★
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -9.8% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.3×
Reviews
What buyers praise and complain about, mined from review topics.What buyers love
“Solid quality”
“Working good”
“Good price”
“Easy to use”
“Works as it should”
“No spills, easy adding, no more bubble over from burping your coolant system”
“Cleans as it should”
“Doesn't leak”
“But it really seemed to break things up nicely”
“This coolant flush gun made back flushing my heater core a piece of cake”
What buyers complain about
“not sure how much leaked out”
“Adapters would not fit my Toyota or Honda”
“Absolutely trash in every”
“it quickly became contaminated with rust also”
“Engine would overheat after running about 5 miles”
“Its the only way I was able to get all air out of my cooling system on my 7th generation honda civic”
“It doesn't come with a manual”
“The water was really nasty”
“The only downside to that was no air pressure”
“deep red that is difficult to see when it is fully dissolved”