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#1
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I think my tempreture gouge is wrong. How can I check/calibrate the tempreture reading system ? I don't have the laser termometer, is there any other conventional ways to read the tempreture ? The only thing I can think of is taking out the temp. sensor ( I think it goes into the termostat housing ) and sticking it into the pot of hot water, than reading the gouge and comparing it to the termometer in the pot.
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Dmitry 90' 300CE 17" Intra Signums Brulen mufler Euro Headlights/Clear Blinkers White gouges (made my own) |
#2
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Try cold first!
If it's like mine, it 'clips' to the front grill below the bumper. Remove the clips and then use ice cubes in a cup (with water). That should test the low temperature portion of the thermometer ok.
If it's close there, then you probably will need to get another data point, so hot water would be appropriate. Not sure that MB go to 212 deg F (boiling water). So maybe just hot water measured with a cooking thermometer would suffice for the second data point. |
#3
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Ooops ! I ment the engine/coolant tempreture. Sorry
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Dmitry 90' 300CE 17" Intra Signums Brulen mufler Euro Headlights/Clear Blinkers White gouges (made my own) |
#4
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temp
I was just thinking that you might want several data points to compare witht the thermometer because maybe its right on one temperature but way off on another
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1996 E320 2000 C230 Kompressor 1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new. |
#5
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I need the method guys !
My tech did this really quick with a laser termometer. He got the reading from the termostat cover where the tempreture sensor goes in. 175 F (80 C) was on his scale. Gouge showed 98 C. Since I dont have the laser termometer, I need an alternative method to duble check this.
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Dmitry 90' 300CE 17" Intra Signums Brulen mufler Euro Headlights/Clear Blinkers White gouges (made my own) |
#6
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If your tech already tested it, then why do you want to test it again?
Also, before you think something might be wrong with it, tell us why you think that. It might be normal. Also, has your thermostat been changed recently?
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2006 E350 w/ 155k miles (Daily Driver) Previous: 1993 300E 3.2L Sedan w/ close to about 300k miles 2003 E500 Brilliant Silver (Had 217k miles when totalled!) 1989 300E with 289,000 miles (had for <1 yr while in HI) 03 CLK 500 cabrio (Mom's) 2006 C230k (Dad's) 1999 S420 (Mom's/Dad's) 2000 C230k Sport sedans 2001 CLK320 Cabrio (Mom's) 1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!) |
#7
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Everething had been changed ! Termostat, waterpump, radiator, fan clutch. The only two posible reasons are the head gusket or scrued up tempreture gouge. (guess wich one I hope it is). I did mess with the gouges when installing white faces, but they worked fine afterwords (temp. was around 87-90). Recently replaced the fan clutch (car overheated in the summer). The next day, when got stuck in trafic t went to 100+. I want to recalibrate the gouge, thats why I am asking. The tech took a mesurment very quickly, I want to take my time and figure out by how much my gouge is off.
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Dmitry 90' 300CE 17" Intra Signums Brulen mufler Euro Headlights/Clear Blinkers White gouges (made my own) |
#8
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100+C. stuck in traffic on a hot summer day is
normal. Aux fan doesn't come on until something like 105-107. |
#9
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Running at 100+ temperature in traffic is quite normal for your Mercedes. If it goes above 110, then I'd worry a little, otherwise, your car is NORMAL and just fine.
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2006 E350 w/ 155k miles (Daily Driver) Previous: 1993 300E 3.2L Sedan w/ close to about 300k miles 2003 E500 Brilliant Silver (Had 217k miles when totalled!) 1989 300E with 289,000 miles (had for <1 yr while in HI) 03 CLK 500 cabrio (Mom's) 2006 C230k (Dad's) 1999 S420 (Mom's/Dad's) 2000 C230k Sport sedans 2001 CLK320 Cabrio (Mom's) 1995 C280 My First Mercedes-Benz... (155k miles. EXCEPTIONAL AUTOMOBILE. Was Very hard to let go of!) |
#10
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I think I confused a lot of people .
I went through this overheating story before and knew how car acts in the summer heat. But this 100+ hapened with 36 F outside ! All winter long the gouge was steady on 90 mark in trafic and on the highway. As soon as I changed the fan clutch, off it went. It now goes up and down like crazy depending on the cars movement. Ranges from 90 (high speed) to 100-110 (slow trafic-gridlock) and te temp outside is below 40 F. What will happen in the summer ?! If the gouge is wrong than car is runing 70-85 and everything is ok. Thats why I need to check the reading to actual T.
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Dmitry 90' 300CE 17" Intra Signums Brulen mufler Euro Headlights/Clear Blinkers White gouges (made my own) |
#11
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You could pull the sensor, and put it in boiling water (100 degree C) and see if your gauge is correct....but I bet it is ok.
If when running down the highway you're at 88 or 90 degrees C, but heats up at slow speed, are you sure that the new fan clutch is ok?? You should be able to tell if the fan is locked up at the higher temp by feeling the air flow FROM THE FRONT OF THE RADIATOR. BE CAREFUL, as we need you to have all your fingers to post on this forum. At the higher temp on the gauge, the fan should be pulling air through the radiator. I had a toyota that would heat up at idle but was fine at speed...turned out to be a bad vacuum advance unit. Your car is gasoline...correct? If the vacuum advance is too far retarded at idle, the engine will run hot at slow speeds. It only took me about a year to figure out the toyota, after, of course, I changed everything in the whole cooling system. If your car is gasoline, check the ignition timing at idle to make sure the vacuum advance is working at speed and idle. Hope this helps....be careful.. Joe |
#12
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If you have a volt meter (digital) you can measure the resistence of the temp sensor and compare it to MB spec. HTH
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Scott Diener 89 300E 93 300E 92 Volvo 740 Wagon aka "Mutt mover" |
#13
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Thats 100 c boiling temp at sea level ,it goes down with elevation , heard some place that coffee tasted best if brewed at the elevation where water boils at 203 f ....
William Rogers....... |
#14
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I did suspect the the new fan clutch. The tech changed it again but it didn't make any diference. It didn't feel like the clutch was ingaging, but than again may be its becouse the car wasn't hot.
Does MB has that vacuum advance ? I never hert of that one before.
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Dmitry 90' 300CE 17" Intra Signums Brulen mufler Euro Headlights/Clear Blinkers White gouges (made my own) |
#15
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ECT Temp vs Resistance
Here's what the manual says for the ECT's temp (deg C) vs resistance. Pull of the top and use an ohmmeter to measure the resistance between adjacent terminals. Readings should be no more than +/-5% from those below. If so replace the sensor.
Temp(C)-Temp(F)---- Ohms 20 -------- 68 ----------- 2500 30 -------- 86 ----------- 1700 40 ---------104 ---------- 1170 50 ---------122 ----------- 830 60 ---------140 ----------- 600 70 ---------158 ----------- 435 80 ---------176 ----------- 325 90 ---------194 ----------- 245 100---------212 ----------- 185 Fixed TYPO error, tnx to Arthur Dalton [Edited by JimF on 04-04-2001 at 03:03 PM] |
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