The coolant thermostat regulates coolant flow to the radiator based on engine temperature, staying closed when cold to let the engine warm up quickly, then opening to allow cooling once at operating temperature.
If you notice any of the following, the part likely needs replacement:
Engine overheating (thermostat stuck closed)
Engine running cold or slow to warm up, poor heater performance (thermostat stuck open)
Temperature gauge fluctuating erratically
Installation information
Requires draining the coolant before removal — always fit a new gasket or O-ring, and check the thermostat is oriented correctly (spring side toward the engine, typically).
Frequently asked questions
Coolant can’t reach the radiator, causing the engine to overheat rapidly — this is a serious fault requiring the vehicle to stop being driven immediately.
Super good! They came through with the part I needed, quickly and at a fair price! Thanks, and I definitely recommend!
I
Ilmars K.
August 2026
★★★★★
I ordered a Heater Blower Motor Resistor for a Toyota Avensis. Delivery took eight days from Latvia to Ireland. I installed it, and everything works perfectly. I wish this company success.
A
Aleksandr L.
Toyota Avensis
August 2026
★★★★★
No complaints about Evro Trans itself, everything's fine. But the delivery..... It felt like the order was being carried by turtles. 4 days from Riga to Daugavpils. Judging by the tracking, the parcel just sat somewhere behind a shed for 3 days, then they found it and delivered it the next day. I think that's why I won't be ordering there again.
P
Paul F.
June 2026
★★★★★
Super fast delivery of the part, and good quality of the used part. Thanks for the service.
N
Natālija I.
May 2026
★★★★★
I ordered antifreeze heaters and an auxiliary pump. Everything arrived quickly, the very next day, and matched the description. I'm satisfied.
J
Juris J.
February 2026
★★★★★
Excellent service, timely delivery, and complete transparency at every step. I highly recommend EvroTrans to anyone looking for a reliable partner!
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Egor S.
November 2025
★★★★★
Bought a front fender for my car. I liked it! After payment they sent more than 20 photos of the problem areas, and it was packed very securely - took a while to unwrap.
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