►Thermostats are a simple device that regulates coolant flow through the engine. When cold it will stay closed, stopping coolant flow and helping the engine warm up faster. Once up to temperature, it will open and allow normal coolant flow and maintain proper engine temperature. Ensuring your Mk4 VW GTI thermostat is functioning properly is crucial to its cooling performance.

There are two types of thermostat failures:
Thermostat stuck open (most common): Coolant will flow through the engine constantly from cold, preventing the engine from reaching operating temperature. Usually this means a rich mixture resulting in poor fuel mileage and potential catalytic converter damage.

Thermostat stuck closed: If the thermostat is stuck closed it will restrict flow into the engine resulting in an overheating condition, resulting in potential catastrophic engine damage.

Follow along as Jay Van Gorden, our VW Catalog Manager, walks you through the steps needed to replace the thermostat on your 1.8t equipped VW Mk4.

Shop the parts used in this video:
VW Mk4 Thermostat Kit: https://www.fcpeuro.com/products/vw-t...

Index:
00:00 - Intro & Tools Needed
02:42 - VW Mk4 Coolant Drain Procedure
06:05 - VW Mk4 Battery Disconnection
03:45 - VW Mk4 Air Pump Line Removal
05:40 - VW Mk4 Coolant Flange Hose Removal
06:47 - VW Mk4 Coolant Flange Upper Bolt Removal
07:00 - VW Mk4 Alternator Bracket Removal
07:45 - VW Mk4 Coolant Flange Upper Bolt Removal
08:45 - VW Mk4 Thermostat Removal
09:28 - VW Mk4 Thermostat & Coolant Flange Install
10:48 - VW Mk4 Alternator Bracket Reinstall
11:00 - VW Mk4 Coolant Flange Hose Reinstall
11:23 - VW Mk4 Coolant Fill Procedure
12:45 - VW Mk4 Buttoning Up the Job
14:58 - Thanks for Watching!

This video applies to the following vehicles:
Volkswagen Beetle
1999 Volkswagen Beetle GL 1.8L
1999 Volkswagen Beetle GLS 1.8L
1999 Volkswagen Beetle GLX 1.8L
2000 Volkswagen Beetle GL 1.8L
2000 Volkswagen Beetle GLS 1.8L
2000 Volkswagen Beetle GLX 1.8L
2001 Volkswagen Beetle GL 1.8L
2001 Volkswagen Beetle GLS 1.8L
2001 Volkswagen Beetle GLX 1.8L
2001 Volkswagen Beetle Sport 1.8L
2002 Volkswagen Beetle GL 1.8L
2002 Volkswagen Beetle GLS 1.8L
2002 Volkswagen Beetle GLX 1.8L
2002 Volkswagen Beetle Sport 1.8L
2002 Volkswagen Beetle Turbo S 1.8L
2003 Volkswagen Beetle GL 1.8L
2003 Volkswagen Beetle GLS 1.8L
2003 Volkswagen Beetle GLX 1.8L
2003 Volkswagen Beetle Turbo S 1.8L
2004 Volkswagen Beetle GLS 1.8L
2004 Volkswagen Beetle GLX 1.8L
2004 Volkswagen Beetle Turbo S 1.8L
2005 Volkswagen Beetle GLS 1.8L


Volkswagen Golf
2000 Volkswagen Golf GLS 1.8L
2000 Volkswagen Golf GTI GLS 1.8L
2001 Volkswagen Golf GLS 1.8L
2001 Volkswagen Golf GTI GLS 1.8L
2002 Volkswagen Golf GTI 337 1.8L
2002 Volkswagen Golf GTI 1.8T 1.8L
2003 Volkswagen Golf GTI 20th Anniversary 1.8L
2003 Volkswagen Golf GTI 1.8T 1.8L
2004 Volkswagen Golf GTI 1.8T 1.8L
2005 Volkswagen Golf GTI 1.8T 1.8L


Volkswagen Jetta
2000 Volkswagen Jetta GLS 1.8L
2001 Volkswagen Jetta GLS 1.8L
2001 Volkswagen Jetta Wolfsburg Edition 1.8L
2002 Volkswagen Jetta GLS 1.8L
2003 Volkswagen Jetta GL 1.8L
2003 Volkswagen Jetta GLS 1.8L
2003 Volkswagen Jetta Wolfsburg Edition 1.8L
2004 Volkswagen Jetta GL 1.8L
2004 Volkswagen Jetta GLS 1.8L
2004 Volkswagen Jetta GLI 1.8L
2005 Volkswagen Jetta GL 1.8L
2005 Volkswagen Jetta GLS 1.8L
2005 Volkswagen Jetta GLI 1.8L


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