My Account
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order

Sierra 18-3666 Marine Thermostat Kit for Volvo Penta Sterndrive Engines 180°F

Part of: Sierra Thermostat Kit for Volvo Penta Marine Engines

Other options in this family: Sierra 18-3674 Sierra 18-3677 Sierra 18-3671 Sierra 18-3618 Sierra 18-3621

Manufacturer

Picture for manufacturer Sierra

Part Number

18-3666
13 reviews
Sale Price

$35.59

1 left at this price

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Sierra 18-3666 is a 180°F (82°C) marine thermostat kit designed as a direct OEM replacement for Volvo Penta sterndrive engines. Engineered to meet OEM specifications, this kit ensures your engine maintains the correct operating temperature for reliable performance and long-term engine health.

Key Features:

  • Rated operating temperature: 180°F (82°C) — the factory-specified setting for compatible Volvo Penta engines
  • Complete kit includes thermostat and 18-2933 seal ring/O-ring for a leak-free installation
  • Direct OEM replacement for Volvo Penta 875580-3
  • Also cross-references Mallory 9-43010
  • Designed for Volvo AQ-series and other compatible Volvo Penta sterndrive marine engines
  • Built to Sierra's OEM-level quality standards
  • Backed by Sierra's limited lifetime warranty

OEM / Cross-Reference Part Numbers:

  • Volvo Penta: 875580, 875580-3
  • Mallory: 9-43010
  • Sierra: 18-3666

Sierra International is the marine industry's leading aftermarket parts manufacturer, offering comprehensive coverage across all major engine brands. The 18-3666 thermostat kit is a trusted solution for Volvo Penta sterndrive engine maintenance and cooling system service.

I did get the order and it was on time . how ever it was not what I need .I did not order the right thing and I send it back . they was very helpful and I was happy with them . steve

Best Price on the Net for K&N System for my 2012 HEMI RAM. My Order 18270 is shipping today and I can't wait to get it installed!

Easy to use website, great prices!

Great prices!

Good.

this was a very easy and user friendly site to use.

Best price !!!!

Easy

I wanted to order a couple of difficult to find accessories for my new Jeep Wrangler. Autoplicity not only had the items I was looking for, but had them at a very reasonable price. The two items were shipped separately but arrived in short order. Thanks to Autoplicity for filling my order #7860 of 3/26/12 quickly and accurately. See you again soon.

I was very surprised that even with shipping, I saved 40% over the exact same item at a local auto store. They shipped the next business day and I am expecting to receive within 1 week of placing the order.<br>Autoplicity's website is easy to navigate and the selection and prices are top notch. I will be ordering from here again!

Very prompt service constantly helping me keep track of my order.

thanks it was simple

Well, I'll start with saying this...I wanted a specific product from COBB tuning that they sell. It was priced lower than any other company so I bought it. This happened on the 22nd, I ended up calling them almost a week later to request tracking info. They were very friendly when they notified me it wouldn't be able to ship out till the 3rd of feb. For a 2 lb item I thought this was pretty slow. They apologized for COBB holding the order up. Its now the 7th, should get my item today!! Overall its a good company with friendly employees, Shipping time is lacking but a trade off for the lowest price. I would refer a friend for price and also mention shipping time expectations. I do believe there's something to be said for quality customer service and low prices...It's becoming harder and harder to find companies that posses such qualities. Honestly, if they had a faster shipping method I would give them a perfect rating.<br>

Share icon
Return Policy
Returns are easy at Boatplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy