Audi 90 Quattro 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

(25)

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

(25)

Car Thermostat Replacement Estimate for Audi 90 Quattro

Audi 90 Quattro Car Thermostat Replacement costs $200 on average.

CarServiceEstimateShop/Dealer Price
1993 Audi 90 QuattroV6-2.8LService typeCar Thermostat ReplacementEstimate$277.45Shop/Dealer Price$349.02 - $503.08
1994 Audi 90 QuattroV6-2.8LService typeCar Thermostat ReplacementEstimate$266.45Shop/Dealer Price$334.97 - $486.75
1988 Audi 90 QuattroL5-2.3LService typeCar Thermostat ReplacementEstimate$244.53Shop/Dealer Price$307.40 - $447.10
1995 Audi 90 QuattroV6-2.8LService typeCar Thermostat ReplacementEstimate$306.44Shop/Dealer Price$385.77 - $545.64
1992 Audi 90 QuattroL5-2.3LService typeCar Thermostat ReplacementEstimate$515.43Shop/Dealer Price$646.05 - $988.95
1990 Audi 90 QuattroL5-2.3LService typeCar Thermostat ReplacementEstimate$244.53Shop/Dealer Price$307.40 - $447.10
1989 Audi 90 QuattroL5-2.3LService typeCar Thermostat ReplacementEstimate$249.53Shop/Dealer Price$312.16 - $451.68
1991 Audi 90 QuattroL5-2.3LService typeCar Thermostat ReplacementEstimate$249.53Shop/Dealer Price$312.81 - $452.82
Show example Audi 90 Quattro 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

(25)

Rating Summary
20
4
0
0
1
20
4
0
0
1

Alec

9 years of experience
32 reviews
Alec
9 years of experience
Audi A6 Quattro V6-3.0L Turbo - Thermostat - Mesa, Arizona
Very good experience. Would definitely have Alec fix my car again.

Chris

22 years of experience
2129 reviews
Chris
22 years of experience
Audi A4 L4-2.0L Turbo - Thermostat - Irvine, California
Fast and professional job!

Fred

17 years of experience
389 reviews
Fred
17 years of experience
Audi S5 V6-3.0L Turbo - Thermostat - Spring, Texas
What a professional! I was very impressed with Fred's skills, communication, and demeanor. A great experience.

Dave

23 years of experience
303 reviews
Dave
23 years of experience
Audi A4 Quattro L4-1.8L Turbo - Thermostat - San Jose, California

Excellent Rating

(25)

Rating Summary
20
4
0
0
1
20
4
0
0
1
Number of Audi Thermostat Replacement services completed
275+
services done by our mechanics
TOTAL NUMBER OF EXPERT Audi MECHANICS
700+
experts on our platform

Recent articles & questions

The Guide To Colored Curb Zones in West Virginia
West West Virginia parking laws: understanding the basics Even though you might not realize it, a big part of driving is knowing where you can and cannot park legally. If you are illegally parked, you may end up having your...
Summertime Do’s and Don’ts For Your Car or Truck
Waxing your paint, watching for overheating, keeping the fuel tank full, and turning the A/C off in very hot weather will help keep your car happy.
P0764 OBD-II Trouble Code: Shift Solenoid C Intermittent
P0764 means a faulty shift solenoid and irregular voltage readings; caused by a failed shift solenoid, internal ATF blockages

Wont start in park but will start in neutral

You may have a worn shift tube bushing in the steering column or loose shift lever at bottom of steering column inside van. Check the tube where shift cable connects to column and may need shift tube replaced.

Does the timing chain need to be replaced when fixing a blown head gasket

Hi there. Anytime you replace the cylinder heads, and internal engine components, it is highly recommended to ensure they connect correctly with lower engine components; such as the crankshaft. This is the job of the timing chain. It's also possible...

Hello Steven I have a few questions I need answers to concerning my 2004 cts 3.6L

As for your power steering issue, it sounds like you might have a leak on your rack and pinion if it only leaks during hard turns. I would recommend having an oil/fluid leak inspection performed on your vehicle to determine...

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