Xoutpost.com - Map cooling

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- - Map cooling (https://xoutpost.com/bmw-sav-forums/x5-e53-forum/89034-map-cooling.html)

civdiv99

09-07-2012 11:24 PM

I'll try to find my notes.

Quote:

Originally Posted by fmugur (Post 895794)

The thermostat is about $100 online. I just replaced it a couple of years back with the water pump. After I put so much effort in the transmission rebuilt which was not a success I just don't like touching it anymore even though i do. I am not looking forward to replace the thermostat. As civdiv was saying the heater in the thermostat shouldn't be the cause of my starting problem but maybe one of the sensors.
I just measured the impedance of the dual temperature sensor and the values are different. I expected them to be the same. I found the table in the GT1 for the impedance / temperature. Shouldn't be both values the same?

fmugur

09-09-2012 06:18 PM

Based on what I have been reading this car has three coolant temp sensors. Two in the dual sensor on the water pump 13621703993 and one at the bottom left of the radiator 13621433077 which is owed mostly for the auxiliar fan.
The two in the dual are used one for the cluster and one for the ECU.
In my case these two don't have the same impedance for some reason.
Can somebody please do a quick measurement for these to sensors at one or two temperatures (use KTMP from the cluster). It's an easy thing. Just unplug the connector and use a ohmmeter. Mostly I need to know if the two values of this dual sensor should be the same.
Thanks in advance.

civdiv99

09-09-2012 08:16 PM

Both should be the same.

BMW part # 13621703993

Bosch tables show:

20 C. = 2.5 K ohms +/- 5%
80 C = 300 ohms

fmugur

09-09-2012 08:37 PM

Quote:

Originally Posted by civdiv99 (Post 895988)

Both should be the same.

BMW part # 13621703993

Bosch tables show:

20 C. = 2.5 K ohms +/- 5%
80 C = 300 ohms

Thanks civdiv. I will have to buy one and replace it.

civdiv99

09-09-2012 09:06 PM

They are cheap. Take a look at ECU

civdiv99

09-09-2012 09:10 PM

If you pm me with an email address, then tomorrow I will send you the step by step processes and readings used in the cold start and warm start procedures for your 4.4. (I found some of my notes and info)

Actually I'll send you more than you ever wanted to know on that engine management system.........

Quote:

Originally Posted by fmugur (Post 895993)

Thanks civdiv. I will have to buy one and replace it.

civdiv99

09-10-2012 10:34 AM

Hang on - found something contradicting first info:

Coolant temperature sensor

A dual temperature sensor is used on the M62 (as on M52). It serves the purpose of registering the coolant temperature both for the engine management system as well as for the remote thermometer in the instrument cluster. For this purpose, two galvanically isolated NTC pellets with different resistance characteristic curves are integrated in the sensor.

Quote:

Originally Posted by fmugur (Post 895993)

Thanks civdiv. I will have to buy one and replace it.

fmugur

09-12-2012 12:24 AM

Thanks civdiv for the material. The thermostat heater element seems to be the problem for the GT1 error message. I sued a 12v light bulb to close the circuit and it's all good not but the starting problem seems to be related to something else. Here is a video of it but I will start a new thread about this issue. I will have to study the material civdiv sent me.

2012-09-11_21-07-24_64.mp4 video by fmugur - Photobucket

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