Dorman 904-377 Diesel Exhaust Fluid (DEF) Heater for Specific Mercedes-Benz Models Fits select: 2013-2015 MERCEDES-BENZ GLK, 2007-2016 MERCEDES-BENZ GL

The factory DEF heater on certain vehicles often fails from fluid intrusion. This Dorman OE FIX solution modifies the OEM design to address this failure point and increase reliability. With over 80,000 products backed by a team of product engineers and experts based in the United States, Dorman is the first choice of automotive professionals, backyard mechanics, and do-it-yourselfers all over North America.

• Upgraded replacement - this diesel exhaust fluid (DEF) heater features additional protection from fluid intrusion
• Restores performance - designed to match the fit and function of the original equipment part
• Thoroughly tested - each design undergoes cyclical heater element fatigue testing
• Trustworthy quality - backed by team of engineers in the United States
• Ensure fit - to make sure this part fits your exact vehicle, input your year, make, model and configuration into the fitment tool on this page
• Vehicle model years this part fits:
  Mercedes-Benz GL320: 2007, 2008, 2009
  Mercedes-Benz GL350: 2010, 2011, 2012, 2015, 2016