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Discussion Starter · #1 ·
Hello Everybody,

First, I would like to state my knowledge regarding cars is limited and therefor i am seeking for assistance and help here. Today, i perform diagnostics on my BMW e46 318i (petrol/LPG) (1998) in search for any error codes and abnormalities. Unfortunately, some of the out date i am not able to understand is it correct or not. I have attached screenshots of the data and would like to kindly ask for anyone to help me go through the data. Is something off charts? What i need to focus my attention to?

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Also i have an issue with the engine temperature. Last few months it started to go over the middle. On the board, it goes around 115c. I think this is not normal, but reading on some forums, people are saying normal working temperature can goes to 125c. I have tried turning on the heater on MAX (set to 32c and and max output) and the temperature drops drastically from 115c to around 93c in matter of minutes.

Noticed, the radiator fan is on 11%, which i could not not know if it is correct or not, as the data is taken when the car is not being driven. So i would assume, the percentage of the fan radiator would go up once the cars starts moving.

This is the main issue i want to get rid off as for now, i would not go on a long trip fearing the engine would overheat.

Anyone having any suggestions?

Please let me know if there are any questions.

Thank you in advance and sorry if something is not understandable.
 

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Yes, those temperatures are excessively high. The engine should run in the 95*C to 100*C range. I assume you car has a manual transmission, hence the cooling fan. The engine computer (ECU) controls the fan speed. The fan receives 12VDC and ground/earth any time the engine is running. How fast the fan turns is determined by the ECU.

Is there a temperature sender in the lower radiator hose? BMWs built for the USA have a sensor in the lower hose. The ECU uses that temperature and other data to set the fan speed. Check that first. Check its resistance with an ohm meter.
 

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Here's a picture of your cooling system:

http://www.realoem.com/bmw/enUS/showparts?id=AL31-EUR-04-1998-E46-BMW-318i&diagId=11_2082

You car does have a sensor (item #11) in the lower radiator hose. That could be the problem. Check it with an ohm meter. If the meter shows 0 ohms or infinite ohms the sensor is bad. Start there. Also, is their a code showing that the fan test failed? The ECU tests the operation of the electrical fan every time the engine is started. There's a code (P#####) set if the fan doesn't work properly at start up.

Have you check the rest of the cooling system? How old are the pump and the thermostat?
 

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Discussion Starter · #4 ·
Thank you for your feedback.

I will check the hose sensor and let you know.

As for the pump and thermostat, i do not know. I bought the car 1 year ago and haven't change any of that.

The weird thing is, sometimes when i take a longer drive (45min>), the analog temperature needle will start going further than middle. Digitally, this starts to happen when the temperature hits 116c. One time, it got to 118c and if i continue driving it will keep on going up (obviously :) ), but i have been told it is normal for the temperature to go up when standing in place (engine on) and to go down while driving due to the additional air intake. But in my situation, if the temperature is over 115c and if i stop the car (engine still working) at that point, the temperature will drop to 113c within a minute. I do not get it, how it cools down when the car is stopped and the engine still working.

Maybe this additional info my prove more useful.

Thank you again :)

Have a nice day.
 
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