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#1
04-26-2004, 03:05 PM
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Thermostat/temp sensor
For a while now, my car has not been above the 60C mark on my temp gauge. I figured the thermostat was stuck open. I replaced the thermostat, and it still sits at 60. The only thing I can think of from here is that the coolant temp sensor is bad. Does this sound right? Anything else I should look at?
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'86 420SE Euro 904 Midnight Blue, Gray Velour Dad bought it new, now I own it. "A Mercedes-Benz is like a fine wine, it only gets better with age." 
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#2
04-26-2004, 03:16 PM
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Could the temp. gauge be at fault?
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Mike Murrell 1991 300-SEL - Model 126 M103 - SOHC "Fräulein"
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#3
04-26-2004, 03:17 PM
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I take it you mean the actual needle in the dash? I guess it's a possibility, but I sure hope not b/c it would be a much bigger PITA.
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'86 420SE Euro 904 Midnight Blue, Gray Velour Dad bought it new, now I own it. "A Mercedes-Benz is like a fine wine, it only gets better with age."
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#4
04-26-2004, 10:38 PM
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The only accurate way to measure the coolant temperature (and compare it to the sending unit/gauge "system") is with a laser digital thermometer. Aim the thermometer at the head of the sending unit. Compare that reading with your gauge. The temperature of the sending unit will be higher than the thermostat since the engine heats up the incoming coolant.
Your car is 18 years old, don'y expect the "sending unit/gauge system" to read accurately at that age. Many still do read accurately, but a large percentage don't. Remember your "system" is reading the head temperature, not the thermostat temperature. A decent tech should have one of these and they are getting pretty inexpensive on ebay. Decent ones start at around $75.
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84 300DT Puke Yellow. Totalled after 438,000 84 300DT Orient Red. 169,000 (actual mileage may vary) 2002 Explorer EB (wife's)
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