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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 09-05-2009, 04:30 PM   #1 (permalink)
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Overheating - Inaccurate temperature gauge sender unit

PLEASE help me!!! My bmw is over heating, I know the problem but I need to know how to remove and replace an innaccurate temperature gauge sensor on a 1997 BMW 318i, or at least how to get to it and clean the connectors because that worked before when a mechanic did it. I do not want to take it to a mechanic, I have not found one that I can trust. M44 E36
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Old 09-05-2009, 08:40 PM   #2 (permalink)
OMFG another one!?
 
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How many miles on the car? Is the cooling system all good, water pump and fans etc?
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Old 09-05-2009, 10:41 PM   #3 (permalink)
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103,000 miles on the car, cooling system is good, hoses look good, one was replaced recently, fan is brand new, bleeder screw is brand new, thermostate needs to be replaced due to overheating but is not the problem, don't know about the water pump. Cooling system will work with the radiator/reservoir cap off, but will not work right with it on. The last mechanic said that the temperature gauge sender unit was bad, he actually did not use those words exactly because he did not use the correct terminology, I guess he thought I could not understand it, he said that what the fan was connected to is not telling it to come on, I have gathered that that is the temperature gauge sender unit, I could be wrong. He cleaned the connectors after I said I was not paying for a $1200 part to fix that car, $1200 I assume is for the unit not the sensor. But he cleaned it and it worked for a month, I just need the car too work a few times so I can trade it in. Any suggestions??? I appreciate the help.

I can't even find the temperature gauge sender sensor to buy, or even the whole unit, I read somewhere that it was called a thermistor...

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Old 09-05-2009, 10:45 PM   #4 (permalink)
OMFG another one!?
 
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I think I'd find out if the water pump has ever been replaced.
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Old 09-05-2009, 11:47 PM   #5 (permalink)
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ok, I will do that, do you know if it's a real chore to replace it?
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Old 09-05-2009, 11:58 PM   #6 (permalink)
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AFAIK, it's essentially similar to a timing chain service, and the M44 having a chain driven cam(s) AFAIK, the missing belt change may mean an older water pump... Just a thought.
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Old 09-06-2009, 02:57 PM   #7 (permalink)
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Models with the M44 engine and standard transmission substitute an electric fan for the belt-driven viscous fan. This is attached to the rear of the radiator and controlled via the DME 5.2 engine management system. In other words, the electric cooling fan is activated by the engine control module (ECM)
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Old 09-06-2009, 03:23 PM   #8 (permalink)
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Do you mean Standard as in Manuel transmission. I have an Automatic transmission. Is it still the same that I have a belt driven fan?

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Old 09-06-2009, 11:12 PM   #9 (permalink)
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The attachment might help locate the sensor too.
Attached Files
File Type: zip TIS photo of Sensor.zip (80.2 KB, 61 views)
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