Audi S4 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

(68)

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

(68)

Car Thermostat Replacement Estimate for Audi S4

Audi S4 Car Thermostat Replacement costs $435 on average.

CarServiceEstimateShop/Dealer Price
2001 Audi S4V6-2.7L TurboService typeCar Thermostat ReplacementEstimate$664.41Shop/Dealer Price$898.04 - $1173.65
2000 Audi S4V6-2.7L TurboService typeCar Thermostat ReplacementEstimate$610.41Shop/Dealer Price$822.68 - $1082.27
2011 Audi S4V6-3.0L TurboService typeCar Thermostat ReplacementEstimate$546.51Shop/Dealer Price$721.79 - $1003.19
2013 Audi S4V6-3.0L TurboService typeCar Thermostat ReplacementEstimate$546.51Shop/Dealer Price$721.60 - $1002.85
1994 Audi S4L5-2.2L TurboService typeCar Thermostat ReplacementEstimate$244.53Shop/Dealer Price$316.75 - $463.47
2009 Audi S4V8-4.2LService typeCar Thermostat ReplacementEstimate$520.48Shop/Dealer Price$670.49 - $994.77
2006 Audi S4V8-4.2LService typeCar Thermostat ReplacementEstimate$775.95Shop/Dealer Price$1014.39 - $1404.99
1993 Audi S4L5-2.2L TurboService typeCar Thermostat ReplacementEstimate$249.53Shop/Dealer Price$322.30 - $469.43
Show example Audi S4 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 Audi mechanics

Real customer reviews from Audi owners like you.

Excellent Rating

(68)

Rating Summary
62
1
0
1
4
62
1
0
1
4

Alfred

0 years of experience
530 reviews
Alfred
0 years of experience
S4 2011 - Coolant is leaking - San Francisco, CA
Alfred was very knowledgeable and was able to diagnose my problem and save me money.

Alfred

0 years of experience
530 reviews
Alfred
0 years of experience
S4 2011 - Cabin Air Filter - San Francisco, CA
Alfred was very knowledgeable and was able to diagnose my problem and save me money.

Theodore

10 years of experience
1656 reviews
Theodore
10 years of experience
S4 2004 - Tire Rotation - Kirkland, WA
Great experience as always

Michael

20 years of experience
391 reviews
Michael
20 years of experience
S4 1994 - Serpentine/Drive Belt - Mesa, AZ
This was absolutely fantastic! Michael was very knowledgeable and thorough. I would absolutely recommend this service and Michael without a doubt!

Excellent Rating

(68)

Rating Summary
62
1
0
1
4
62
1
0
1
4
Number of Audi S4 services completed
748+
services done by our mechanics
TOTAL NUMBER OF EXPERT Audi MECHANICS
700+
experts on our platform

Recent articles & questions

10 Best Stores to Buy Auto Parts in Boise, Idaho
Automotive technicians rely on auto parts stores to add and replace car parts. The best auto parts shop in Boise is Bow Wow Auto Parts.
How Long Does a Steering Damper Last?
Most Most of us are used to being able to enjoy smooth, precise movement when we turn the steering wheel in our vehicle. That is made possible by a combination of different components, including the splines that mate the steering...
P2344 OBD-II Trouble Code: Cylinder #9 Above Knock Threshold
P2344 means an issue with the cylinder 9 knock sensor circuit. Some causes are faulty knock sensor, damaged wires, and cylinder firing malfunctions.

Brake pedal is hard to push

Hi there, thanks for writing in. I'd be happy to provide my insight. There is a possibility that they may have overfilled the brake reservoir with brake fluid. Start by checking that it has the proper amount. Secondly, it is...

How do I turn on the defogging logic feature?

The defogging logic feature automatically controls the air intake to keep the window from fogging up. To set the defogging logic system, follow these steps: 1. Turn the ignition to the ON position. 2. Press the Defrost button. 3. Press...

Hey Tim ok if i do get the G6 inspected i under stand it is $70 for it but if i have the part of the power steering pump i unders

Hi Dewayne. I've cc'd the sales and service department on this reply, as they are better qualified to answer the specifics of this question. They should be contacting you via email directly for clarification.

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