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#1
06-16-2003, 04:19 PM
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Directions for 300E thermostat replacement
Does anyone in here have instructions and/or pictures on how to replace a thermostat on a 1988 300E? I need to do this and have never done it before.
Thanks in Advance!! Allan
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1973 280 - Sold 1980 300SD - Sold 1982 240D - Stolen 1988 300E - Sold 1989 260E - Sold 1989 560SEL 1994 E420 - Sold 1997 E420 2005 CL500 
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#2
06-16-2003, 05:26 PM
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1.- Make sure engine is cool
2.- Open coolant reservoir 3.- Place a BIG clean pan to pick up the leaking coolant (when you remove the thermostat Housing) 4.- Remove the thermostat housing (2 or 3 bolts?) 5.- Remove old thermostat(gasket?) 6.- Place new thermostat the same way the old one was(gasket?) 7.-Screw back on the housing (2 or 3 bolts?) It took me 10 minutes.
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1999 Porsche 996 Carrera Convertible 1994 420E - SOLD 1986 300E - SOLD, what a car 609 Certified
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#3
06-16-2003, 05:37 PM
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A small addition to pesuazo's tips:
There is a small pinhole on the thermostat that assists in evacuating air in the system. Make sure the thermostat is oriented in such a manner that the pinhole is at the highest position of the housing. Actually, this isn't too critical, since the M104 configuration has the thermostat housing nearly level at every bolt location (three in your case)...but I place mine with the pinhole at about the 12 o'clock position (if you are facing the engine from the front)...
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2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car
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#4
06-16-2003, 05:51 PM
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OK I feel dumb asking this but is the thermostat located near or on the coolant reservoir. Where is it located? (The thermostat)
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1973 280 - Sold 1980 300SD - Sold 1982 240D - Stolen 1988 300E - Sold 1989 260E - Sold 1989 560SEL 1994 E420 - Sold 1997 E420 2005 CL500
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#5
06-16-2003, 06:02 PM
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Its ontop of the water pump which is to the right of the distributor if your facing the engine...it has a hose attached to a the thermostat housing which has (3) ten mm bolts holding it in place... take g-benz's advice and make sure the pinhole is at the highest elevation posible...good luck
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Brandon 2008 S550 1957 Dodge D100 1967 VW Microbus 21 Window 2001 Suburban 2004 Beach cruiser bicycle -----------------GO DUKE!----------------- "It cannot be emphasized too strongly or too often that this great nation was founded not by religionists, but by Christians; not on religion, but on the Gospel of Jesus Christ. For that reason alone, people of other faiths have been afforded freedom of worship here." Patrick Henry 1776
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#6
06-16-2003, 07:34 PM
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Anybody know the torque values for those three little bolts?
Thanks.
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David His: 2003 Dodge Durango SLT 2002 BMW E39 530i Sport 1988 Mercedes 300TE Hers: 2003 Chevrolet Suburban 1999 E430
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#7
06-16-2003, 07:36 PM
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dont have the service CD's here with me at the office.....but I can tell you its not very high...You could wrench one off rather easily
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Brandon 2008 S550 1957 Dodge D100 1967 VW Microbus 21 Window 2001 Suburban 2004 Beach cruiser bicycle -----------------GO DUKE!----------------- "It cannot be emphasized too strongly or too often that this great nation was founded not by religionists, but by Christians; not on religion, but on the Gospel of Jesus Christ. For that reason alone, people of other faiths have been afforded freedom of worship here." Patrick Henry 1776
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#8
06-16-2003, 08:06 PM
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Quote:
There are two bolt heads beside the dipstick handle. Pull one or both when filling to bleed air from the cooling system. When coolant comes out of the holes, it's full. Sixto 95 S420 91 300SE 87 300SDL 83 300SD
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