![]() ![]() If a thermostat sticks partially open, it will act like a restrictive orifice, which allows a certain amount of flow at a certain pressure. These effects are also affected by the ambient air temperature. If it sticks wide open, the engine will not warm up to operating temperature and the heater won't blow warm air. If it sticks closed, the engine will overheat which can cause serious expensive damage. Left long enough, the thermostat will eventually stick at some position. As thermostats and the coolant age, deposits are left on the thermostat which restrict its movement. Hence the different temperature ratings of thermostats. It's designed to keep the engine coolant temperature at a certain minimum temperature. As the coolant temperature in the engine rises, the thermostat starts to open. The closed thermostat helps the engine warm up to normal operating temperature. The water pump is applying pressure but the thermostat controls how much flow there is. ![]() If there is a bleeder hole it will allow a very small amount of coolant flow when the engine is cold. Sometimes thermostats have a small bleeder hole in them so that when you drain the coolant it will allow bubbles to enter the engine which allows all the coolant to drain out. What's supposed to happen in a car is when you start it cold, the thermostat is immersed in ambient temperature coolant, so unless you live somewhere that's really hot, the thermostat is completely closed. When refilling the coolant, I used half of the Mercedes coolant, half of the distilled, water, then back to the coolant, then used the rest of the water, I also started the vehicle and topped it off when the coolant got sucked in.A thermostat is a valve that opens a certain amount based on the temperature of the liquid it's immersed in. INSTALLATION NOTES - Personally, I had to take out the air intake tub (pretty easy) to gain access to the T-stat housing the radiator hose attached to it. ![]() Start the vehicle, observe all the connection areas for leaks, top off the reservoir with whatever fluids you have left from the 2 jugs, seal the cap to the radiator reservoir, turn off the vehicle, reattach the plastic underbelly with the 4 bolts and restart car and look for any leaks. The housing pulls straight out but may take a wiggle or two.Ĥ) Once you pull the housing out, the T-stat is attached to the end you just detach it, pull out the rubber ring, replace it, and attach the new T-stat.ĥ) Rebolt the T-stat housing (2 bolts, make tight), reattach the radiator hose to the housing, attach metal clip, tighten the red radiator drain plug (tight), fill up radiator reservoir with Mercedes coolant (or Mercedes approved coolant) and fill up with water. The hose has a metal tension clip around it you can detach it with a flat head screw driver – after moving the clip away from the hose, pull the hose out of the housing - you may unbolt the housing now. ![]() Socket wrench w/ 9mm (star pattern?) bolt attachment (for T-stat housing on engine head)Ĩmm bolt attachment (for plastic underbelly to get to radiator drain)ĭrive up ramps or Hydraulic heavy lift (to get to drain plug and 4 screws for plastic underbelly)ġ) Drive car up ramps or lift the vehicle a good amount so you can reach all the bolts for the forward plastic underbelly just after the bumper.Ģ) Place catching device below RED draining cap and turn slowly until you get liquid flowing out, open the radiator reservoir cap in the engine and allow the coolant to flow out.ģ) After the coolant is nearly gone or to a drip, you may now unbolt the T-stat housing (2 bolts) but first you must detach the hose attached to it. One jug Mercedes Anti-Corrosive Coolant orĮqual size jug of distilled water (you pour in one whole jug of coolant, then water) Thermostat (T-stat) with replacement O-ring M271 engine 2003 Mercedes c230 Kompressor Sport Sedan ![]()
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