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#1
06-18-2004, 06:03 PM
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E420 Temperature Range
My 420 seems to run very cool. Seldom above the 60 bar or about 140 degrees.
In stop and go on a warm (hey, it's Seattle) day it may briefly nudge the 80 bar, but not much higher. Drove south to VanWa a couple weekends ago and it was between 40 and 65 the whole time. I checked engine and radiator and both were well with in what I would call normal operating temperture. Is this a "problem" or should I worry about world peace in my spare time? Thanks
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KyGuy '04 E500 Brilliant Silver/Ash (50K) '01 ML320 Desert Silver/Parchment (67K) '99 C230 Kompressor Black/Black (62K) '93 Mitsubishi Montero (134K)(Home Depot Express) '70 6.3 Gold/Tobacco (128K) (sold and now in Germany) '94 E420 Silver/Blue (80K) - Sold '97 E320 PearlBlack/Parchment (77K) - Sold '66 300SE Coupe (owned 2002-2003) 
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#2
06-18-2004, 06:38 PM
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Mine used to run cool... so my mechanic decided to change the thermostat.
Also... possibly... the probe that checks the engine temp and reports it back to the guage might be faulty.
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Willy '94 E420 White Mods ------- Berg Werks Keyless Entry Buzzer replaced with Chime Dash Light Upgrade Burlwood/Leather shift knob Alpine CDA-9815 Head Unit 2002/2003 16" C Class 7-Spoke Wheels Updated "Chip" to fix Code 19 problem
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#3
06-18-2004, 07:29 PM
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<
Here is the test info for that... 60C-110 ohm 80C-67 " 100C-38 " Last edited by Arthur Dalton; 06-18-2004 at 07:41 PM.
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#4
06-21-2004, 04:49 PM
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I had this same problem with my E420. It would usually run at 40-60C on the highway and might get up to just under 80C when in town. Replacing the thermostat fixed it (82C min warmed up temp). Engine wear and fuel consumption are significantly increased when the engine is run cold. I would recommend you change it ASAP.
Chris
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#5
06-21-2004, 05:10 PM
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How hard is replacing the thermo?
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KyGuy '04 E500 Brilliant Silver/Ash (50K) '01 ML320 Desert Silver/Parchment (67K) '99 C230 Kompressor Black/Black (62K) '93 Mitsubishi Montero (134K)(Home Depot Express) '70 6.3 Gold/Tobacco (128K) (sold and now in Germany) '94 E420 Silver/Blue (80K) - Sold '97 E320 PearlBlack/Parchment (77K) - Sold '66 300SE Coupe (owned 2002-2003)
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#6
06-22-2004, 05:04 PM
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Had a similar problem . . . .
but it read just a little low. After removing the tstat, it would not close all the way; so there was a bypass path which made the car warm up very slowly.
You should replace the tstat and check the resistance in Dalton's post to see if the sensor is bad. If ok, then it's the tstat. It's a bugger(!) to change at least for me: it located near the rubber hose (the short one about 4"). The hard part is getting that hose back on.
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