Lexus RX450h Car Thermostat Replacement Costs

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Car Thermostat Replacement Service

How much does a Car Thermostat Replacement cost?

On average, the cost for a Lexus RX450h Car Thermostat Replacement is $285 with $89 for parts and $196 for labor. Prices may vary depending on your location.

Car	Service	Estimate	Shop/Dealer Price
2015 Lexus RX450hV6-3.5L Hybrid	Service typeCar Thermostat Replacement	Estimate$608.08	Shop/Dealer Price$688.71 - $899.42
2016 Lexus RX450hV6-3.5L Hybrid	Service typeCar Thermostat Replacement	Estimate$602.34	Shop/Dealer Price$679.69 - $895.85
2011 Lexus RX450hV6-3.5L Hybrid	Service typeCar Thermostat Replacement	Estimate$499.44	Shop/Dealer Price$551.16 - $690.22
2018 Lexus RX450hV6-3.5L Hybrid	Service typeCar Thermostat Replacement	Estimate$471.69	Shop/Dealer Price$541.11 - $743.54
2010 Lexus RX450hV6-3.5L Hybrid	Service typeCar Thermostat Replacement	Estimate$499.44	Shop/Dealer Price$556.83 - $700.14
2014 Lexus RX450hV6-3.5L Hybrid	Service typeCar Thermostat Replacement	Estimate$498.50	Shop/Dealer Price$550.52 - $689.28
2012 Lexus RX450hV6-3.5L Hybrid	Service typeCar Thermostat Replacement	Estimate$499.44	Shop/Dealer Price$551.22 - $690.32
2017 Lexus RX450hV6-3.5L Hybrid	Service typeCar Thermostat Replacement	Estimate$602.34	Shop/Dealer Price$676.71 - $890.65

Show example Lexus RX450h Car Thermostat Replacement prices

What is an engine cooling system thermostat and how does it work?

The car's engine cooling system thermostat is a small valve within a cooling system passageway that opens and closes in response to the temperature of the circulating engine coolant. When your car is first started and the coolant is cold, the valve in the thermostat will be in the closed position, circulating the coolant flow only within the engine instead of flowing to the radiator, which allows the engine to warm up fast, promoting fuel efficiency, low emissions, and reduced engine deposits. Once the engine coolant reaches the design temperature, usually around 195 degrees, the valve will open and close as you drive in order to maintain a coolant temperature typically between 195 to 225 degrees Fahrenheit.

Thermostat

When to consider replacing the engine cooling system thermostat:

Engine overheats. A thermostat with the valve stuck closed is a common cause of engine overheating. However, since there are other causes of overheating, a mechanic will thoroughly inspect the cooling system prior to condemning the thermostat. Since it is usually not known how badly the engine overheated, the mechanic will also try to determine if there is evidence that the cylinder head gasket was blown. If so, it would be repaired prior to replacing the thermostat.
Temperature gauge reads too low or too high. Thermostats can get sticky, causing the engine temperature to stray from the optimal range. Your dash-mounted temperature gauge will notify you of this malfunction.
Cooling system repairs. All thermostats eventually fail. Therefore, if the cooling system is already open for major repairs, such as water pump or radiator replacement, it is recommended to install a new thermostat simply as insurance against future breakdown.

How do mechanics replace the engine cooling system thermostat?

Once the engine is completely cold, the radiator cap is loosened and enough coolant is drained from the radiator so the coolant level is below the thermostat housing.
The thermostat housing is removed and the thermostat and gasket are extracted. Note that some cars have more than one cooling system thermostat and both might need replacement.
All mounting surfaces on the thermostat housing are cleaned of old gasket material. A new gasket is applied and the thermostat is re-installed in the correct orientation and with the temperature sensing cylinder facing downward towards the engine.
The thermostat housing bolts are tightened to original equipment manufacturer (OEM) specifications using a calibrated inch-pound torque wrench.
The cooling system is refilled with the appropriate coolant type and the system is fully bled of all air.
The car engine is run until the normal operating temperature is reached, and while taking precautions with the hot coolant, the coolant level is rechecked while confirming there is flow through the radiator — either visually or with an infrared temperature gun. This will confirm the thermostat is open. Finally, the engine is checked for leaks.

Is it safe to drive with an engine cooling system thermostat problem?

No. If it has been determined that there is a thermostat problem, it should be repaired right away. Failure to do so can cause substantial and costly damage to the engine.

When replacing the engine cooling system thermostat keep in mind:

Engine overheating due to causes other than a faulty thermostat, will themselves damage a thermostat. Therefore, always replace the thermostat if the engine overheats, even if the thermostat was not the initial cause of the overheating.
The thermostat should be replaced anytime you have major work done on the coolant system. It is convenient and costs little during such repairs and insurance against future breakdown.
OEM thermostats are the best ones to use and you can request your mechanic to install only the OEM thermostat. Dealer supplied, OEM thermostats are sometimes more costly but are generally higher quality and specifically engineered for your car.

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Milton

38 years of experience

239 reviews

Milton

38 years of experience

by Dhruv

Lexus RX450h V6-3.5L Hybrid - Pre-purchase Car Inspection - Las Vegas, Nevada

Very professional and thorough

Peter

44 years of experience

1397 reviews

Peter

44 years of experience

by Rachel

Lexus RX450h V6-3.5L Hybrid - Brake System Flush - New River, Arizona

I would like to rate Peter 10 stars if I could! Here's a guy who's already hit 1000 5 star reviews! That's insane! When two other mechanics cancelled on me for a brake flush on my Lexus RX450h, YourMechanic sent their "best" tech out to do it. And they weren't kidding. Peter is one of the very best if not "the best" there is. Not only did he do the job quickly and correctly but he has an amazing bedside manner. He is one of the most intelligent people I've met in a long time and I had an amazing conversation with him. You can tell that he loves people as well as cars and it is more than just about the money for him. YourMechanic has a superstar here and they should have him training staff for how to treat clients as well as for his vast knowledge about cars, how the subsystems work, and how to troubleshoot and repair them. If YourMechanic continues to hire such top tier guys like Peter, car shops are going to be in trouble. Absolutely amazing service in every way. YourMechanic has brought humanity back to car care and has given amazing mechanics a more flexible schedule so it's a win-win. I really enjoy getting to know the person who is directly taking care of my vehicle. You just cannot compete with that. Thank you Peter. It was a sincere honor to meet you! And what a great accent! If you're lucky enough to book him, definitely do.

Damian

12 years of experience

430 reviews

Damian

12 years of experience

by Joseph

Lexus RX450h V6-3.5L Hybrid - Car is not starting - Winter Garden, Florida

Communicative and prompt. Quickly diagnosed the problem and fixed it the first time.

John

20 years of experience

138 reviews

John

20 years of experience

by Priyank

Lexus RX450h V6-3.5L Hybrid - Brake Pads Replacement (Rear) - Austin, Texas

John provided excellent services, was timely and polite in his conversations.

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