Best Selling Coolant Cap: See Top Product Rankings by Sales Volume & Market Trends

August 2026
48 Products Tracked

Looking for the most popular coolant cap products in the market? Our report leverages real Amazon monthly sales data to identify the best-performing products and the fastest-growing opportunities within the search results for the keyword "coolant cap." Whether you're searching for winning products to launch or monitoring market trends and competitor performance, this report provides the insights you need.

Based on monthly sales analytics, our Shoppers' Top Picks highlights that ASIN B01I40ZQWE currently leads the coolant cap market with 4K monthly sales, followed closely by B081PVY8VK with 500 monthly sales and B000C9SP4W with 400 monthly sales. Meanwhile, ASIN B081PVY8VK stands out as the fastest-growing product, achieving an impressive 66.7% month-over-month sales growth. By tracking competitor sales performance and shifts in market demand, sellers can uncover emerging opportunities and make more informed product and marketing decisions.

🏆Shoppers' Top PicksAmazon
by monthly sales August 2026
EPAuto Spill Proof Radiator Coolant Filling Funnel Kit
1
B01I40ZQWE
$21.87·
4.7
Units/sold4K
19106-RNA-A48 Radiator Coolant Reservoir Overflow Tank Cap with Joint Replacement Fit for Honda Acura Accord Civic Pilot Insight Element
2
B081PVY8VK
$5.99·
4.6
Units/sold500
ACDelco GM Original Equipment RC27 (10409635) Radiator Fill Cap
3
B000C9SP4W
$14.99·
4.7
Units/sold400
🚀Fastest Growing
by MoM sales growth
19106-RNA-A48 Radiator Coolant Reservoir Overflow Tank Cap with Joint Replacement Fit for Honda Acura Accord Civic Pilot Insight Element
#1
B081PVY8VK
$5.99·
4.6
19106-RNA-A48 Radiator Coolant Reservoir Overflow Tank Cap with Joint Replacement Fit for Honda Acura Accord Civic Pilot Insight Element
Units/sold
50066.7%
MotoRad T18 Radiator Cap - Jeep Wrangler (97-17) Grand Cherokee (93-21) Patriot (11-17) Compass (12-17), Dodge Charger (06-23) Journey (09-20) Durango (00-21) Challenger (08-21), Chrysler 300 (05-21)
#2
B000C5GB10
$8.61·
4.5
MotoRad T18 Radiator Cap - Jeep Wrangler (97-17) Grand Cherokee (93-21) Patriot (11-17) Compass (12-17), Dodge Charger (06-23) Journey (09-20) Durango (00-21) Challenger (08-21), Chrysler 300 (05-21)
Units/sold
30050.0%

Top Selling Coolant Cap

As of August 2026, we analyzed 48 tracked products in Amazon's "coolant cap" search results and generated the following sales chart and product rankings based on monthly sales data. The ranking below highlights the Top 10 products by estimated monthly sales. According to the latest data, these products generated between 300 and 4,000 monthly sales. B01I40ZQWE leads the coolant cap market with an estimated 4,000 monthly sales, down 20.0% from the previous month.

48Products Tracked
710Top 10 Avg. Sales
$11.04Top 10 Avg. Price
4.6Top 10 Avg. Rating
🏆
EPAuto Spill Proof Radiator Coolant Filling Funnel Kit
#1
B01I40ZQWE

EPAuto Spill Proof Radiator Coolant Filling Funnel Kit

4,000
▼ 20.0%
Units Sold/mo
$21.87
Price
4.7
Rating
20.5K
Reviews
2
19106-RNA-A48 Radiator Coolant Reservoir Overflow Tank Cap with Joint Replacement Fit for Honda Acura Accord Civic Pilot Insight Element
B081PVY8VK
$5.99
4.6 (1.1K)
19106-RNA-A48 Radiator Coolant Reservoir Overflow Tank Cap with Joint Replacement Fit for Honda Acura Accord Civic Pilot Insight Element
500 Units Sold/mo▲ 66.7%
3
ACDelco GM Original Equipment RC27 (10409635) Radiator Fill Cap
B000C9SP4W
$14.99
4.7 (2K)
ACDelco GM Original Equipment RC27 (10409635) Radiator Fill Cap
400 Units Sold/mo
4
ACDelco GM Original Equipment RC98 (15075118) 15 P.S.I. Radiator Surge Tank Cap
B000IXRMSM
$10.99
4.8 (2.2K)
ACDelco GM Original Equipment RC98 (15075118) 15 P.S.I. Radiator Surge Tank Cap
400 Units Sold/mo
5
Gates 31528 Standard Radiator Cap
B000C2SCZ6
$9.63
4.6 (706)
Gates 31528 Standard Radiator Cap
300 Units Sold/mo
10
Car Radiator Cap,Coolant Reservoir Cap OEM#16401-31520,1640131520,Standard Radiator Coolant Reservoir Tank Cap Compatible with Lexus Toyota Scion,Auto Replacement Parts(for Lexus)
B0CQR7G14F
$5.98
4.4 (174)
Car Radiator Cap,Coolant Reservoir Cap OEM#16401-31520,1640131520,Standard Radiator Coolant Reservoir Tank Cap Compatible with Lexus Toyota Scion,Auto Replacement Parts(for Lexus)
300 Units Sold/mo▲ 33.3%
View All 48 Products & Deep InsightsGet full access to sales data, trends, and market analysis

For sellers and category managers benchmarking the coolant cap price landscape, we segmented all 48 tracked listings in Amazon's live "coolant cap" search results across the full price spectrum, and surfaced the top 3 price tiers by share below to highlight where competition concentrates and where pricing gaps exist.

Leading the distribution, the $0.00 ~ $10.00 band is the category's best coolant cap price zone, absorbing 39% of the assortment (97 products) — this is where listing density is highest and where new entrants face the steepest competition for share-of-voice. Use the tier breakdown below to identify the top-ranking ASIN, monthly sales velocity, and rating profile within each band — essential inputs for pricing strategy, sourcing decisions, and competitive benchmarking in the coolant cap category.

Top 3 Price Tiers

$0.00 ~ $10.00 is the most competitive price tier, containing 39% of tracked products.

Sweet Spot
$0.00 ~ $10.00
Tier 1
39%
97 products

Top products in this price tier

#1
B01I40ZQWE
$21.87
4k Units Sold/mo
Unlock Top Performers
#2
$10.00 ~ $20.00
Tier 2
37%
93 products
$20.00 ~ $50.00
Tier 3
11%
27 products
$50.00 ~ $100.00
7%
Unlock to view all price tier distributions and their ASIN sales contributions

"Coolant cap" Search Volume and Market Trends on Amazon

Amazon keyword search volume data for "coolant cap" in the US marketplace. This report provides insights into keyword search volume, Amazon search trends, competition levels, and conversion efficiency for sellers and brands.

During the week of 2026-08-09 to 2026-08-15, the Amazon USweekly search volume for "coolant cap" was approximately 225 searches. The keyword currently holds an Amazon Search Frequency Rank (SFR) of #791,072, climbing 159,240 positions from the previous week. Additionally, the top 3 products for this keyword capture 13.8% of the total click share and 9.5% of the conversion share, indicating the level of market concentration.

Amazon Search Term
Weekly

coolant cap

ASINSIGHT
Search Frequency Rank
791,072
159,240
Search Volume
225
22.3%
Top 3 Click Share
13.8%
Top 3 Conv. Share
9.5%

Search Volume Trend

Past 3 Years
Past 4 Months
Recent 8 months
Weekly Search Volume
225
View full trends for the past 3 years
AugSepOctNovDecJanFebMarAprMayJunJulAug
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