1997 e420 thermostat grrrrrrrrrrr.... - Mercedes-Benz Forum

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Old 02-16-2011, 12:09 PM   #1 (permalink)
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1997 e420 thermostat grrrrrrrrrrr....

my thermostat is stuck open and the engine temp takes 20-25 min to get up to 80 degrees celsius. i got a new thermostat a couple days back and i wanted to replace it right now but i have to idea how to get to it.... there are three bolts holding it down to the water pump but only 2 of them are easily accessible. to me it looks like ill have to take off the V-belt and the water pump to take the bad thermostat off, unless there is a way to unscrew the third bolt in the back which i cant figure out how... i thought this was supposed to be an easy job that usually takes no more than 30 minutes
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Old 02-16-2011, 08:23 PM   #2 (permalink)
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For the 3rd bolt in the back I used a ratchet with an extension on my 1996 E320.

http://www.benzworld.org/forums/w210...placement.html
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Old 02-16-2011, 10:07 PM   #3 (permalink)
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i saw that DIY but my thermostat location was different for some reason. it was on the left side of the water pump and parallel to the ground. i got it done but it took me a good couple of hours. maybe ill take a picture of it later and post it here.

matt
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Old 02-20-2011, 10:19 AM   #4 (permalink)
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M119 thermostat change

Without a doubt, replacing a thermostat on my E420 last Christmas was one of the most aggravating jobs I have done because I went into it thinking, how hard could this be? I mean - really? Grrrrrrrrrr

Combined this job with a coolant system drain, belt replacement and a Duovalve changeout. Fully committed by cutting off the short angle hose using garden shears, which was later a bear in itself to get the new one back on. (Had to boil the hose to soften it and use silicone grease to slip it back on - hated to do that, used as little as possible grease on the interior of the hose as to not contaminate the coolant system.)

Had to try 3 different socket - rachet combos before finding one that (barely) worked to put back the 10 mm capscrew on the opposite side of the garden shears. Settled on a tiny 1/4 combo set. Don't even think about trying to get a torque wrench on these capscrews. Another reason to use the 1/4 mini set.

TIPS - This job required removal of the serpentine belt, and removal of the oil dipstick capscrew tube to engine block bushing to access everything, particularly the back bolt. (Second photo with oil tube pushed away.) Another lesson learned, remove the engine oil dipstick and put something in place to avoid dropping anything down into the engine. I kept the dipstick in place and wound up breaking off the plastic red head with one bump. (That piece of wisdom cost me $29, and I never found the red head that rattled down.)
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Old 02-21-2011, 05:35 AM   #5 (permalink)
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yup thats the same one i have. i used a combination of a 2 inch socket extension and one of those universal joint sockets to get that bolt out and i still had trouble. there is barely any working space in there and one of the sockets fell underneath the water pump on top of the frame and i couldnt even get it out... but i think it fell out when i first drove it after the job... what was mercedes thinking designing this car... there are so many things that in most other cars are simple but in this car they are just a pain in the a**...
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Old 02-21-2011, 08:25 AM   #6 (permalink)
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That is why I love I6 engines
I still remember older V8 engines, that required spark plug replacement via wheel wells. Those were 20,000 miles spark plugs.
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Old 02-22-2011, 04:20 PM   #7 (permalink)
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Matt - I was speculating that the M119 thermostat designer was a decendent of Marquis de Sade. The only other thing I've encountered of equal cruelty was replacement of the front driver side O2 sensor.

My E420 has marginal heat removal in the summer, wanted to see if the old thermostat popped late or was clogged. No such luck, it popped 80 deg C on the stove top inside my wife's best sauce pan using the turkey thermometer. (I still regret getting caught on that one.)

Kris - changing plugs through a wheelwell? Yikes!

Mike
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Old 02-22-2011, 04:33 PM   #8 (permalink)
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atmsmshr,

You forgot the location of the evaporator!
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Old 02-22-2011, 04:48 PM   #9 (permalink)
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Musikman - I'll pray to the good Lord that mine holds up and let me pass on those tight confines.
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Old 02-22-2011, 04:52 PM   #10 (permalink)
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Quote:
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Musikman - I'll pray to the good Lord that mine holds up and let me pass on those tight confines.
Haha, same here!
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