M103 M104 Straight 6 Gas Engine Thermostat Replacement - On Demand Video

A major cause of poor fuel economy and weak cabin heater performance

Many owners neglect replacing the engine coolant thermostat. It just slowly wears out over time. If you notice your engine temperature running low or you car taking a long time to heat up inside these are the first signs your thermostat has failed. 

M103 M104 Straight 6 Gas Engine Thermostat Replacement - On Demand Video
On Demand Video

Product Details

Do not neglect replacement. If you keep running with a cold engine it will increase engine wear and lower performance. It is a cheap part and some you can do yourself with a few standard metric hand tools. 

The video covers the following:

  • Thermostat function and importance
  • Location of thermostat
  • Draining coolant out of the radiator
  • Safely removing the thermostat housing bolts
  • Removing a stuck radiator hose
  • Clamping the hose to minimize spills
  • Removing the housing cover
  • Tricks to removing “stuck” thermostats without damaging the housing
  • Cleaning the housing and cover before installing new thermostat
  • Orientation of thermostat and new sealing ring
  • Preparing the bolts to prevent future seizure
  • Preventing dropping the bolts down into the engine
  • Replacing the cover and tightening bolts properly
  • Refilling the tank reservoir with coolant
  • Bleeding air out of the hoses
  • Checking the reservoir cap
  • Precautions when you finish the job
  • Saving $$$ doing it yourself

This video was filmed replacing a thermostat on a W124 1992 300CE coupe. Principles directly apply the inline 6 engines from 1986 to 1993, but indirectly apply to almost all Mercedes engines. 

Total Run Time 15:25

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