Coolant Reservoir Cap
MaybeThe top 5 brands take only 35% of clicks. But shoppers spend an estimated $73K a year here, so Coolant Reservoir Cap is a Maybe.
- Flapen Score
- 55 / 100Top 23% of 7,287 Automotive niches · +6 vs the category median of 4955
- Market size
- $73K/yr162K searches / yr
- 90-day growth
- -10.1%search demand this quarter
- Competition
- 22%top-5 click share · 61 brands · 148 sellers
Flapen Score
Coolant Reservoir Cap against its category
The dotted line is the Automotive average. Past it, Coolant Reservoir Cap is stronger. Inside it, weaker.
Market
The Coolant Reservoir Cap market on Amazon at a glance
Shoppers on Amazon United States searched for Coolant Reservoir Cap 162K times last year and spent an estimated $73K. The top 5 brands take 35% of clicks. Flapen scores it 55 out of 100, a Maybe.
01 · Demand
An estimated 5.3% of those searches ended in a purchase.
Shoppers searched for this 162K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 5.3% of those searches ended in a purchase. Searches in the last 90 days moved -10.1% against the 90 days before. Searches, conversion and average price together put the market at an estimated $73K a year.
- Searches, last 12 months
- 162K
- Growth, 90 days vs prior 90
- -10.1%
- Conversion, latest week
- 5.3%
- Market size, estimated
- $73Ka year
- Peak month
- November1.1× the quietest month
- Top search term
- coolant reservoir cap68K searches a year
02 · Price
A sale here is worth $8.59.
Listings sell for $8.59 on average, from $3.08 to $20.38. Amazon reports units sold in ranges. This niche sold 10K to 13K a year. The average listing sells 100 to 250 of them. At $8.59 that is $859 to $2K a year per listing.
- Average price
- $8.59under the $15 to $100 sweet spot
- Price range
- $3.08–$20.38
- Amazon United States median price
- $24.38across 115,062 niches
- Units sold a year
- 10K–13K
- Units per listing a year
- 100–250
- Revenue per listing a year
- $859–$2K
- Returns
- 2.8%of orders · Amazon United States median 2.1%
03 · Entry bar
The bar here is low.
56% of listings pay for placement with sponsored ads. 100% ship with Prime. On an average day, 0.8% of listings are out of stock. The average listing ranks #2,353 within Caps. It carries 264 reviews at 4.28 stars, so a new listing needs social proof before a better product.
- Sponsored listings
- 56%
- Prime listings
- 100%
- Out of stock, average day
- 0.8%
- Average rank
- #2,353in Caps
- Average rating
- 4.28 starsAmazon United States average 4.42 stars
- Average reviews
- 264per listing
- Listings tracked
- 89
04 · Newcomers
0 of last year's 15 launches cleared the first-year sales bar.
15 products launched here in the last 12 months. 0 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 32 months on average, so a newcomer is not facing entrenched names.
- Launched, last 12 months
- 15
- Successful launches
- 0Amazon's first-year sales bar
- Average brand age
- 32 months
Products
Top Coolant Reservoir Cap products & what they sell for
The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.
Prices and ratings read from Amazon on Jul 9, 2026. The live listing can differ.
Top sellers
by estimated 90-day click share
Dorman 54201 Engine Coolant Reservoir Cap Compatible with Select Models
- Price
- $12.42
- Rating
- 4.6/5
- Reviews
- 4,822
- Age
- 11y ago

2PCS Engine Radiator Coolant Water Tank Black Reservoir Cap Compatible with Infiniti Nissan Renault OEM# 21712-79900
- Price
- $6.26
- Rating
- 4.4/5
- Reviews
- 385
- Age
- 2y ago

DeFageH 2Pcs Coolant Reservoir Cap - Premium Leak-Proof Coolant Caps for OEM# 21712-79900 Compatible with Nissan Pathfinder Maxima Murano Infiniti G35
- Price
- $4.37
- Rating
- 4.6/5
- Reviews
- 26
- Age
- 5mo ago

13502353 Coolant Reservoir Cap for Chevy GMC Buick Cadillac -Silverado 1500 2500 3500 Express Avalanche Suburban Captiva Cavalier Equinox Malibu Savana Sierra Yukon Radiator Surge Tank Cap
- Price
- $11.52
- Rating
- 4.4/5
- Reviews
- 162
- Age
- 4y ago

Car Radiator Cap Replacement OEM#68442532aa 53479332 Coolant Reservoir Cap Compatible with Chrysler Dodge Jeep Ram Standard Car Accessories Radiator Cover Easy to Mounting
- Price
- $7.20
- Rating
- 4.5/5
- Reviews
- 84
- Age
- 2y ago
Trending
estimated 90-day click momentum
4PCS Coolant Reservoir Cap Replacement OEM# 21712-79900 - Radiator Overflow Coolant Reservoir Tank Cap Compatible with Nissan Murano Rogue Versa Quest & Infiniti EX35 FX37 G35 M35
- Price
- $3.08
- Rating
- 4.8/5
- Reviews
- 11
- Age
- 4mo ago

Houlishu 2 Pack Coolant Reservoir Cap Replacement Universal Radiator Reservoir Cap Compatible with OEM# 21712-79900 Black Overflow Tank Cover for Water & Antifreeze
- Price
- $6.09
- Rating
- 3.4/5
- Reviews
- 18
- Age
- 5mo ago

DeFageH 2Pcs Coolant Reservoir Cap - Premium Leak-Proof Coolant Caps for OEM# 21712-79900 Compatible with Nissan Pathfinder Maxima Murano Infiniti G35
- Price
- $4.37
- Rating
- 4.6/5
- Reviews
- 26
- Age
- 5mo ago

SWQS Coolant Reservoir Tank Cap for Toyota Engine Coolant Expansion Tank Cap 16471-0A030 Radiator Coolant Caps Replacement for Toyota Sienna 2004-2010 Lexus RX330 2004-2006 & RX350 2007-2009 (Black)
- Price
- $9.93
- Rating
- 3.0/5
- Reviews
- 2
- Age
- 7mo ago

HZEL Car Coolant Reservoir Cap Vehicle Radiator Surge Tank Cap OEM# 13502353 13598760 1305248 Automotive Replacement Accessories Compatibility with Encore Regal Verano
- Price
- $5.78
- Rating
- 3.8/5
- Reviews
- 16
- Age
- 10mo ago
Newest
by launch date
4PCS Coolant Reservoir Cap Replacement OEM# 21712-79900 - Radiator Overflow Coolant Reservoir Tank Cap Compatible with Nissan Murano Rogue Versa Quest & Infiniti EX35 FX37 G35 M35
- Price
- $3.08
- Rating
- 4.8/5
- Reviews
- 11
- Age
- 4mo ago

DeFageH 2Pcs Coolant Reservoir Cap - Premium Leak-Proof Coolant Caps for OEM# 21712-79900 Compatible with Nissan Pathfinder Maxima Murano Infiniti G35
- Price
- $4.37
- Rating
- 4.6/5
- Reviews
- 26
- Age
- 5mo ago

Houlishu 2 Pack Coolant Reservoir Cap Replacement Universal Radiator Reservoir Cap Compatible with OEM# 21712-79900 Black Overflow Tank Cover for Water & Antifreeze
- Price
- $6.09
- Rating
- 3.4/5
- Reviews
- 18
- Age
- 5mo ago

SWQS Coolant Reservoir Tank Cap for Toyota Engine Coolant Expansion Tank Cap 16471-0A030 Radiator Coolant Caps Replacement for Toyota Sienna 2004-2010 Lexus RX330 2004-2006 & RX350 2007-2009 (Black)
- Price
- $9.93
- Rating
- 3.0/5
- Reviews
- 2
- Age
- 7mo ago

HZEL Car Coolant Reservoir Cap Vehicle Radiator Surge Tank Cap OEM# 13502353 13598760 1305248 Automotive Replacement Accessories Compatibility with Encore Regal Verano
- Price
- $5.78
- Rating
- 3.8/5
- Reviews
- 16
- Age
- 10mo ago
Competition
Competition: brands, sellers & click share
The top 5 products take an estimated 22% of clicks, no more. An open shelf where new products get seen.
Brands
61 rising
Sellers
148
Est. top-5 brand share
35%
Top 20: 74%
Est. top-5 click share
22%
Top 20: 57%
Open market
61%
- Dorman13%
- ACDelco7%
- ROVIKE5%
- KEVWR5%
- SWQS4%
- DeFageH4%
Demand
Coolant Reservoir Cap search demand
Weekly searches over the year, seasonality beneath. Pick a range.
No pronounced peak months · busiest ÷ quietest = 1.1×
Search terms
Top Coolant Reservoir Cap search terms shoppers use
The exact words shoppers type, with estimated yearly volume, growth, and conversion.
- coolant reservoir cap68K/yr
- coolant cap30K/yr
- coolant cap replacement11K/yr
- coolant reservoir tank cap12K/yr
- reservoir cap10K/yr
- radiator reservoir cap8K/yr
- coolant overflow cap5K/yr
- radiator overflow cap4K/yr
- engine coolant reservoir cap4K/yr
- coolant tank cap4K/yr
Reviews and returns
What reviews say buyers love and hate about Coolant Reservoir Cap
We read the reviews and the return reasons for every product selling here.
“Doesnt fit advertised to fit”
Every topic
Every topic buyers talk about, one row each.
Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.
15 topics
Keep looking
Related niches
Niches in the same category that score near this one. Research these next.
Best Flapen score
The highest-scoring niches we track right now, across every category.
FAQ
Common Coolant Reservoir Cap questions
Answered from the same tracked data.
Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data









