Volvo Penta Thermostat 82°C 20450736 | D5A D7A D7C TAD Series
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Volvo Penta OEM Thermostat — Part No. 20450736
- Part Number: 20450736
- Brand: Volvo Penta (Genuine OEM)
- Type: Engine Cooling Thermostat
- Opening Temperature: 82°C (approximately 180°F)
- System: Engine Cooling — coolant flow regulation
- Aftermarket Reference: REC20450736
What This Part Does
This genuine OEM thermostat regulates coolant temperature in compatible Volvo Penta diesel engine cooling circuits. It stays closed while the engine warms up — allowing faster warm-up to operating temperature — then opens at 82°C to allow coolant to flow through the heat exchanger. A failed thermostat can cause chronic overheating, running too cold, or unstable temperature readings.
Compatible Applications
- Volvo Penta D5A-B TA
- Volvo Penta D5A-T
- Volvo Penta D5A-TA
- Volvo Penta D7A-B TA
- Volvo Penta D7A-T
- Volvo Penta D7A-TA
- Volvo Penta D7C-B TA
- Volvo Penta D7C-TA
- Volvo Penta TD420VE
- Volvo Penta TAD420VE
- Volvo Penta TAD620VE
- Volvo Penta TAD650VE
- Volvo Penta TAD660VE
- Volvo Penta TAD750VE
- Volvo Penta TAD760VE
Always confirm fitment by engine serial number and the current Volvo Penta cooling-system diagram for your specific engine version before ordering.
Serial Number & Fitment Notice
Volvo Penta D5/D7 and TAD-series cooling systems can use different thermostat arrangements depending on engine version and production range. Match part number 20450736 to your engine serial number and thermostat housing diagram before ordering to avoid fitment issues.
Service Interval
Volvo Penta recommends inspecting the thermostat as part of scheduled cooling-system service. Replace any time the thermostat is removed and shows corrosion, sticking, or seal deterioration, or whenever cooling-system symptoms suggest thermostat failure.
When to Replace
- Engine runs consistently too cold or fails to reach normal operating temperature
- Engine overheats or temperature gauge is unstable
- Slow or erratic warm-up behaviour
- Cooling-system fault codes or warnings
- Thermostat removed during service and shows sticking, corrosion, or seal wear
Installation Notes
- Drain coolant to the required level before removing the thermostat housing
- Clean all mating surfaces on the thermostat housing before fitting the new thermostat
- Replace the thermostat housing seal or gasket at the same time — do not reuse old seals
- Refill with the correct Volvo Penta-approved coolant mixture for your engine
- Bleed air from the cooling system after refilling
- Verify the temperature gauge reads within the normal operating range after a full warm-up cycle
- Follow the Volvo Penta service manual for your specific engine model throughout
Related Products
Parts Desk Insights
The thermostat is one of the most cost-effective first checks when a Volvo Penta D5, D7, or TAD-series engine has a temperature complaint — chronic running-cold or slow warm-up are classic signs. The most common installation oversight is reusing the old thermostat housing seal: always replace the seal at the same time. Fitment across the D5/D7/TAD family looks similar but the serial number confirmation step is important — cooling-system layouts can vary between closely related engine versions.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
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