BMW 135is Car Thermostat Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

customer ratings

(104)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

customer ratings

(104)

Car Thermostat Replacement Estimate for BMW 135is

BMW 135is Car Thermostat Replacement costs $534 on average.

CarServiceEstimateShop/Dealer Price
2013 BMW 135isL6-3.0L TurboService typeCar Thermostat ReplacementEstimate$901.24Shop/Dealer Price$1130.36 - $1712.97
Show example BMW 135is Car Thermostat Replacement prices

Car Thermostat Replacement Service

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.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(104)

Rating Summary
103
0
0
0
1
103
0
0
0
1

Dave

23 years of experience
303 reviews
Dave
23 years of experience
BMW X3 L4-2.0L Turbo - Thermostat - San Jose, California
Dave is the third person who has tried to diagnose the problem with my car and he fixed for about half of the original estimate in about half the time budgeted. I only hope that I'm able to get him again for ongoing service.

Allen

36 years of experience
471 reviews
Allen
36 years of experience
BMW 335xi L6-3.0L Turbo - Thermostat - Orlando, Florida
Allen was extremely friendly, accommodating, knowledgable, and honest. His communication and follow-up to ensure the vehicle was running properly following repairs, was exceptional. I would highly recommend Allen.

Jason

32 years of experience
439 reviews
Jason
32 years of experience
BMW M6 V10-5.0L - Thermostat - San Jose, California
Excellent service

Alex

16 years of experience
435 reviews
Alex
16 years of experience
BMW 530i L6-3.0L - Thermostat - McKinney, Texas
After Alex finished my radiator hose and thermostat, my car runs great. Job well done!

Excellent Rating

(104)

Rating Summary
103
0
0
0
1
103
0
0
0
1
Number of BMW Thermostat Replacement services completed
1144+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1100+
experts on our platform

Recent articles & questions

How to Replace a Brake Wheel Cylinder
The wheel cylinder on the brake system fails if the brakes are mushy, they respond poorly, or there is leaking brake fluid.
What Does the Oil Pressure Warning Light Mean?
The oil pressure light warns you when the oil pressure in your car is getting low, due to either a pump malfunction or low oil level in the engine.
Disabled Driver Laws and Permits in Mississippi
Whether Whether or not you a disabled driver, you should be aware of the disabled driver laws in your state. Every state is a little different in the rules and regulations they have for disabled drivers. Mississippi is no exception....

a rattling noise from my engine when i accelerate and my engine light keeps on flickering ever since. safe to take it on a trip?

With the running description you gave you should not drive it long distance if you are getting engine noise and check engine light flashing. The problem may be low oil pressure or another issue with a sensor. Have the vehicle...

Does 2006 impala LTZ have gas turn off switch (aka inertia switch)? 2006 Chevrolet Impala

Hi there - short answer is "No". These inertia switches were popular with Ford designs in years past, but GM does not use them for this model. Check fuses for the fuel pump and fuel pump relay. If the fuel...

New alternator and battery checks out fine but cars still dying and electrical issues.

Hi, thanks for writing in. It sounds like there may be a problem in the wiring, a faulty connection, or even a control module. It is going to take some diagnostic work to determine exactly where the problem is located....

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com