What are the precautions and steps for replacing a thermostat on Volkswagen Jetta?

Do not drive the vehicle without a thermostat, this may leave the computer in open loop, which adversely affects the emissions and fuel economy. In case of disconnection of the battery, a number of systems will have to be re-learned to operate correctly. The models 2.0L (CBPA) and 2.5L (CBTA, CBUA) have a bypass thermostat positioned in the top section of the bypass hose. The first stage is to take off the engine cover and unscrew the negative battery terminal. Lift the front part of the car safely on jackstands and then remove the under car splash shield. Take out the coolant in the radiator, keeping it in mind that the coolant is new or refilling it with the warning of already used antifreeze. In the case of 1.4L engines, it can be stated that two thermostats exist, one serves the main cooling circuit, and another one serves the engine block. Take out the intake air resonator, air filter housing and charge air cooler air pipe, and disconnect the coolant hose clamps and take out the hoses of the thermostat cover. Unscrew the thermostat housing clamps and take the cover off, be ready to spill with coolant. Wipe down the mating surfaces then follow with a special thermostat removal tool or snap-ring pliers and pull out the thermostat. Install a new thermostat making sure to align the centering pin, then a new gasket and the thermostat cover is to be reattached. Installation is the opposite to removal. Otherwise, replace small thermostat, fill and bleed system, then engine check. In the case of the cylinder block circuit thermostat, take off the water pump and heat exchanger connection bolts and detach the water pump and the heat exchanger assembly and take out the thermostat. Place a new thermostat in the water pump making sure that it is well aligned and then clean the mating surfaces before reassembling the thermostat cover. Repeat the refill and bleed process. In the case of the 2.0L (CBPA) engine, the thermostat housing is located below the intake manifold, and the radiator hose is disconnected, as well as the fasteners of the housing are removed. Install new O-ring and thermostat, with jiggle valve upwards. The reverse of the removal is the installation. In 1.8L and 2.0L engines, take out the water pump and throttle body, disconnect the coolant hoses, and also take out the engine temperature control actuator assembly. Cleaning of mating surfaces, installation of new O-rings and fixing of the assembly, proper alignment. The installation will be inverted and then the system will be refilled and bled. With 2.5L engines, the intake manifold, thermostat cover and seal are removed and the thermostat installed with the jiggle valve up. Insert the cover again and repeat the reverse process of installing, making sure you refill and bleed the system as well as ensuring that you do not have any leaks.

Genuine Volkswagen Jetta Thermostat

Engine Coolant Thermostat

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19 Thermostats found

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Volkswagen Jetta Thermostat Part Number: 044-121-113
$52.43 MSRP: $72.82
You Save: $20.39 (28%)
Ships in 1-2 Business Days
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Product Specifications
- Replaces: 056-121-113-D
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 1984-2005 Volkswagen Jetta | Base, Carat, Celebration Edition, City, GL, GL TDI, GLI, GLI 16-Valve, GLS, GLS TDI, GT, Jazz, K2, Limited Edition, TDI, Trek, Wolfsburg Edition | 4 Cyl 1.6 L DIESEL, 4 Cyl 1.7 L GAS, 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS
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Volkswagen Jetta Thermostat Part Number: 04E-121-113-G
$52.43 MSRP: $72.82
You Save: $20.39 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2013-2021 Volkswagen Jetta | Hybrid, Hybrid SE, Hybrid SEL, Hybrid SEL Premium, R-Line, S, SE, SEL, SEL Premium, Wolfsburg Edition | 4 Cyl 1.4 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 1.4 L GAS
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Volkswagen Jetta Thermostat Part Number: 1K0-121-113-A
$52.43 MSRP: $72.82
You Save: $20.39 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Joint
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2009-2015 Volkswagen Jetta | Base, GLI, S, SE, SEL, Wolfsburg Edition | 4 Cyl 2.0 L GAS, 5 Cyl 2.5 L GAS
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Volkswagen Jetta Thermostat Part Number: 07K-121-113-B
$60.68 MSRP: $84.98
You Save: $24.30 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2005-2014 Volkswagen Jetta | 2.5, S, SE, SEL, Value Edition, Wolfsburg Edition | 5 Cyl 2.5 L GAS
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Volkswagen Jetta Thermostat Part Number: 04E-121-113-F
$78.53 MSRP: $109.98
You Save: $31.45 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2013-2018 Volkswagen Jetta | Hybrid, Hybrid SE, Hybrid SEL, Hybrid SEL Premium, S, SE, Wolfsburg Edition | 4 Cyl 1.4 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 1.4 L GAS
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Volkswagen Jetta Thermostat Part Number: 03G-121-113
$80.91 MSRP: $113.32
You Save: $32.41 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2009-2010 Volkswagen Jetta | GLI, TDI, TDI Cup Edition, Wolfsburg Edition | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
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Volkswagen Jetta Thermostat Part Number: 03G-121-113-A
$80.91 MSRP: $113.32
You Save: $32.41 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2005-2006 Volkswagen Jetta | GL TDI, GLS TDI, TDI | 4 Cyl 1.9 L DIESEL
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Volkswagen Jetta Thermostat Part Number: 06H-121-113-B
$90.43 MSRP: $126.65
You Save: $36.22 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2012-2013, 2008-2010 Volkswagen Jetta | GLI, S, SEL, TDI, TDI Cup Edition, Wolfsburg Edition | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
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Volkswagen Jetta Thermostat Part Number: 06F-121-111-F
$98.76 MSRP: $138.32
You Save: $39.56 (29%)
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Product Specifications
- Other Name: Thermostat Housing
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2006-2010 Volkswagen Jetta | 2.0T, GLI, SEL, Wolfsburg Edition | 4 Cyl 2.0 L GAS
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Volkswagen Jetta Thermostat Part Number: 06K-121-113-G
$109.47 MSRP: $153.32
You Save: $43.85 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Replaces: 06K-121-113-E
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2014-2018 Volkswagen Jetta | Base, GLI, GLI SE, GLI SEL, S, SE, SE Sport, SEL, SEL Premium, Sport | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
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Volkswagen Jetta Thermostat Housing Part Number: 03L-121-111-AM
$118.99 MSRP: $166.65
You Save: $47.66 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Thermostat
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2010-2015 Volkswagen Jetta | S, TDI, TDI Premium, TDI S, TDI SE, TDI SEL | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
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Volkswagen Jetta Thermostat Part Number: 06J-121-113-A
$127.32 MSRP: $178.32
You Save: $51.00 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2009-2010 Volkswagen Jetta | GLI, SEL, Wolfsburg Edition | 4 Cyl 2.0 L GAS
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Volkswagen Jetta Thermostat Part Number: 06L-121-111-P
$205.87 MSRP: $288.33
You Save: $82.46 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2019-2024 Volkswagen Jetta | GLI 35th Anniversary Edition, GLI Autobahn, GLI S | 4 Cyl 2.0 L GAS
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Volkswagen Jetta Thermostat Unit Part Number: 07K-121-115-C
$221.33 MSRP: $309.98
You Save: $88.65 (29%)
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Product Specifications
- Other Name: Adapter
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2005-2014 Volkswagen Jetta | 2.5, S, SE, SEL, Value Edition, Wolfsburg Edition | 5 Cyl 2.5 L GAS
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Volkswagen Jetta Thermostat Part Number: 04L-121-113-C
$45.35 MSRP: $62.98
You Save: $17.63 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2015 Volkswagen Jetta | TDI S, TDI SE, TDI SEL | 4 Cyl 2.0 L DIESEL
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Volkswagen Jetta Thermostat Part Number: 7E0-121-113-B
$45.35 MSRP: $62.98
You Save: $17.63 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2019-2021 Volkswagen Jetta | R-Line, S, SE, SEL, SEL Premium | 4 Cyl 1.4 L GAS
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Volkswagen Jetta Thermostat Part Number: 04E-121-113-N
$53.51 MSRP: $74.32
You Save: $20.81 (28%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2019-2021 Volkswagen Jetta | R-Line, S, SE, SEL, SEL Premium | 4 Cyl 1.4 L GAS
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Volkswagen Jetta Thermostat Part Number: 075-121-113-D
$42.80 MSRP: $59.45
You Save: $16.65 (29%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 1995-2004 Volkswagen Jetta | GLI, GLS, GLX | 6 Cyl 2.8 L GAS
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Volkswagen Jetta Thermostat Part Number: 06K-121-111-P
$396.49 MSRP: $541.65
You Save: $145.16 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Replaces: 06K-121-111-N, 06K-121-111-M, 06K-121-513-B, 06K-121-441
- Warranty: This genuine part is guaranteed by Volkswagen's factory warranty.
Fits the following Vehicles:
- 2014-2018 Volkswagen Jetta | GLI, GLI SE, GLI SEL, SE, SE Sport, SEL, SEL Premium, Sport | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS

Volkswagen Jetta Thermostat

Volkswagen Jetta Thermostat is located close to the radiator and its primary task is to open or close the coolant channel to ensure that the engine remains within the sweet temperature range in which power, fuel economy, and component life are enhanced. By being a closed-loop control device, the Thermostat continuously measures the temperature, and then rapidly operates the flow of coolant on or off to avoid overheating on hot days and harsh operation when cold. Through the decades, Volkswagen models have had two important mechanical solutions. Simple bonded metal strip Thermostat. Early cars utilised a bimetallic strip Thermostat, a simple type that is a bonded metal spring that folds when hot and slides a valve almost instantly. The subsequent versions applied a unit of a wax pellet which swells up as the unit gains heat and a plunger is forced open by the swelling unit to open the passage more easily and at a constant setpoint. The strip itself is fast responding and can vibrate and flutter, whereas the wax capsule is more composed in movement and swings less to maintain its target temperature. The current Volkswagen design maintains the calibration to ensure that the Jetta gets to the working heat in a short distance and maintains it through the miles of driving without a driver having to adjust the settings as the household programmable or communicating models do. With such attention, the automatic protection of the engine by the cooling system of any Volkswagen at any season of the year has been achieved.

Choose OEM Thermostat for superior quality and long-lasting durability. They match the Volkswagen's factory specifications exactly and pass strict quality control. If you plan to replace Thermostat on your Jetta, put OEM at the top of your list. You'll get the right fit, reliable performance, and peace of mind. We stock an extensive inventory of genuine Volkswagen Jetta parts. It is easy to find what you need. You will love our competitive prices that help you save. No more hassle with returns or guesswork. Every part includes a warranty straight from the manufacturer. Get trusted quality, strong durability, and real value today.

Volkswagen Jetta Thermostat Parts and Q&A

Thermostat Housing
03L-121-111-AM
Q: What are the precautions and steps for replacing a thermostat on Volkswagen Jetta?
A:
Do not drive the vehicle without a thermostat, this may leave the computer in open loop, which adversely affects the emissions and fuel economy. In case of disconnection of the battery, a number of systems will have to be re-learned to operate correctly. The models 2.0L (CBPA) and 2.5L (CBTA, CBUA) have a bypass thermostat positioned in the top section of the bypass hose. The first stage is to take off the engine cover and unscrew the negative battery terminal. Lift the front part of the car safely on jackstands and then remove the under car splash shield. Take out the coolant in the Radiator, keeping it in mind that the coolant is new or refilling it with the warning of already used antifreeze. In the case of 1.4L engines, it can be stated that two thermostats exist, one serves the main cooling circuit, and another one serves the engine block. Take out the intake air resonator, air filter housing and charge air cooler air pipe, and disconnect the coolant hose clamps and take out the hoses of the thermostat cover. Unscrew the thermostat housing clamps and take the cover off, be ready to spill with coolant. Wipe down the mating surfaces then follow with a special thermostat removal tool or snap-ring pliers and pull out the thermostat. Install a new thermostat making sure to align the centering pin, then a new gasket and the thermostat cover is to be reattached. Installation is the opposite to removal. Otherwise, replace small thermostat, fill and bleed system, then engine check. In the case of the cylinder block circuit thermostat, take off the Water Pump and heat exchanger connection bolts and detach the water pump and the heat exchanger assembly and take out the thermostat. Place a new thermostat in the water pump making sure that it is well aligned and then clean the mating surfaces before reassembling the thermostat cover. Repeat the refill and bleed process. In the case of the 2.0L (CBPA) engine, the thermostat housing is located below the intake manifold, and the radiator hose is disconnected, as well as the fasteners of the housing are removed. Install new O-ring and thermostat, with jiggle valve upwards. The reverse of the removal is the installation. In 1.8L and 2.0L engines, take out the water pump and throttle body, disconnect the coolant hoses, and also take out the engine temperature control actuator assembly. Cleaning of mating surfaces, installation of new O-rings and fixing of the assembly, proper alignment. The installation will be inverted and then the system will be refilled and bled. With 2.5L engines, the intake manifold, thermostat cover and seal are removed and the thermostat installed with the jiggle valve up. Insert the cover again and repeat the reverse process of installing, making sure you refill and bleed the system as well as ensuring that you do not have any leaks.