What You're Actually Buying
This is the wax-pellet style coolant thermostat for the D13 engine family, used in Volvo VN/VNL trucks and Mack Pinnacle/Anthem trucks sharing that block. It controls flow between the block and radiator so the engine warms up right and doesn't run cold on the highway or overheat sitting at idle.
21412639 replaced some earlier Volvo numbers over the years as they revised the housing seal and pellet response rate, so don't be surprised if your old part has a different number stamped on it - that's normal for a part that's been in service over a decade of production changes.
This one's a direct replacement for the factory unit, not a redesign - same flow rate, same opening temp, same housing fit.
Why These Numbers Cross
21613426 shows up as a running production change - Volvo updates thermostats the same way they update every other part number, usually a minor tweak to the seal material or the pellet housing, but the fit and function stay the same. 20560249 and 21237213 are earlier D13 numbers that this one supersedes.
On the Renault side 7421412639 is just Volvo's European parent company using their own prefix on the identical part - Renault Trucks and Volvo share engine platforms, so that's a straight match, not a coincidence.
The PAI 801160 and the Cross-Reference 801160 are the aftermarket manufacturer number for the same physical part - different box, same thermostat inside. What actually matters here is the opening temperature stamped on the thermostat itself and the seal/gasket surface - if your old part has a different opening temp printed on it, don't swap based on truck year alone, check the number stamped on the housing.
Buying This From Us
We keep 21412639 in stock at the Tacoma counter, and if you're local we can have it in your hand same day - no waiting on a warehouse transfer for a part this common. If you're not local we ship nationwide and it usually lands in two to three days.
Every one of these carries our 6+ month warranty, no hassle if something's actually wrong with the part out of the box.
Before you order, pull the number off your old thermostat or run your VIN by us - D13 spec changed enough over 15+ years of production that we'd rather confirm than have you sending one back.
21412639 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 21412639. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Cross-Reference | 21613426, 21237213, 20560249, 840.TH622639MA, 801160 |
| Renault Trucks OE | 7421412639 |
| PAI | PAI-801160 |
Frequently asked questions
Does 21412639 fit my 2015 Volvo VNL with a D13?
Likely yes, but confirm with the number stamped on your old thermostat or give us your VIN - Volvo made a few running changes to the D13 cooling system over that model run and we want to match it exact, not guess.
Is this the same as the PAI 801160?
Same physical part, different label - PAI is an aftermarket manufacturer building to the same spec. We stock ours under the Volvo cross-reference number but it's the identical thermostat.
My old thermostat is stamped 21237213 - will 21412639 work?
That's an earlier Volvo number that this one supersedes, so it should interchange, but check your seal/gasket surface and opening temp stamp against the old part before you install it. When in doubt, call the counter with both numbers and we'll confirm.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.