BMW 128i 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

(78)

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

(78)

Car Thermostat Replacement Estimate for BMW 128i

BMW 128i Car Thermostat Replacement costs $384 on average.

CarServiceEstimateShop/Dealer Price
2012 BMW 128iL6-3.0LService typeCar Thermostat ReplacementEstimate$640.87Shop/Dealer Price$804.09 - $1211.06
2010 BMW 128iL6-3.0LService typeCar Thermostat ReplacementEstimate$616.81Shop/Dealer Price$773.61 - $1170.68
2011 BMW 128iL6-3.0LService typeCar Thermostat ReplacementEstimate$625.87Shop/Dealer Price$784.93 - $1188.79
2008 BMW 128iL6-3.0LService typeCar Thermostat ReplacementEstimate$616.81Shop/Dealer Price$773.55 - $1170.57
2013 BMW 128iL6-3.0LService typeCar Thermostat ReplacementEstimate$625.87Shop/Dealer Price$784.97 - $1188.86
2009 BMW 128iL6-3.0LService typeCar Thermostat ReplacementEstimate$616.81Shop/Dealer Price$773.61 - $1170.67
Show example BMW 128i 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

(78)

Rating Summary
72
4
1
0
1
72
4
1
0
1

Fremy

11 years of experience
1 reviews
Fremy
11 years of experience
128i 2010 - Brake Pads - The Colony, TX
He takes time to do the job right. Very friendly and courteous. He really cares about make sure your car is running properly.

Jermaine

22 years of experience
147 reviews
Jermaine
22 years of experience
128i 2012 - Brake Pads - Burtonsville, MD
Very knowledgeable and personable. Did a great job and finished ahead of schedule.

Ben

34 years of experience
1419 reviews
Ben
34 years of experience
128i 2010 - Brake Shoes (Rear) - Bellaire, TX
Fabulous

Excellent Rating

(78)

Rating Summary
72
4
1
0
1
72
4
1
0
1
Number of BMW 128i services completed
858+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1100+
experts on our platform

Recent articles & questions

Top 3 Reasons Brake Dust Shields are Necessary
Brake dust shields reduce the buildup of road grime, extend brake system life, and prevent premature failure.
P0331 OBD-II Trouble Code: Knock Sensor 2 Circuit Range/Performance (Bank 2)
Trouble code P0331 means the powertrain control module (PCM) senses a faulty knock or ping noise coming from the car engine.
How to Replace an Electronic Ignition Pickup
The electronic ignition pickup is part of the ignition distributor. Signs of failure include intermittent misfiring or failure all at once.

I need to replace my [ignition coils](/topics-ignition-coil-toyota/), [spark plugs](/topics-spark-plug-toyota/), and a new valve cover gasket so my car will run again

Hi I just bought a replacement key for my Honda accord but it is now locked in the ignition and alarm keeps coming on. What can I do?

Transmission shifting issue, rough idle

If the engine is not running properly this can cause the transmission to shift poorly sometimes. I would recommend resolving the issue with the engine running poorly before having any transmission repairs performed. It is also possible that the amount...

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