Transmission Coolant Temp - Mercedes GLA Forum
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post #1 of 11 Old 01-12-2020, 10:59 PM Thread Starter
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Transmission Coolant Temp

My tranny coolant temp remains below normal limits (in the blue) despite all other fluids being fully warm. This is a new "issue." Thoughts anyone?

P.S.-full service was performed on the transmission <5K miles ago and it has performed flawlessly until now.
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post #2 of 11 Old 01-13-2020, 07:25 AM
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If everything mechanically performs normally I would think the temperature sensor and/or its wiring is the issue. Vehicles are rolling computers these days and as such more often the electronics are the root cause.

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post #3 of 11 Old 01-13-2020, 10:09 AM Thread Starter
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Any idea where to locate and how to test the sensor?
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post #4 of 11 Old 01-13-2020, 01:58 PM
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If everything mechanically performs normally I would think the temperature sensor and/or its wiring is the issue. Vehicles are rolling computers these days and as such more often the electronics are the root cause.
And one conclusion to this is always check the battery first!!!
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post #5 of 11 Old 01-15-2020, 07:09 PM Thread Starter
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And one conclusion to this is always check the battery first!!!
Huh?!?!
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post #6 of 11 Old 01-15-2020, 07:17 PM
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There are a lot of voltage sensitive sensors in a modern car. A weak battery can cause the sensors to give erratic information to the computers and create false readings. Same with bad connections (check your grounding wires).
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post #7 of 11 Old 01-16-2020, 02:58 AM
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I had a similar issue (engine temp almost never went up to normal operating temp) and in the end, it threw an engine check light.

After the thermostat & hoses were replaced, everything is now fine.

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post #8 of 11 Old 01-16-2020, 08:09 PM
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Can you give a little more of an explanation? What’s the ambient temp out? Are you driving in Sport or Sport+ and getting on the car and it still isn’t coming up to temp?

If you drive in C mode and drive non aggressively, the trans takes a long time to warm up to 120*(temp where blue goes to white). I took off on a highway cruise in like 30 degree weather recently and threw on distronic at about 75mph and the trans was at 118* and still blue after probably 20-30 miles. Getting on it though and driving with some spirit temps get where they should.
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post #9 of 11 Old Today, 01:37 AM Thread Starter
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Quote:
Originally Posted by Wayne View Post
There are a lot of voltage sensitive sensors in a modern car. A weak battery can cause the sensors to give erratic information to the computers and create false readings. Same with bad connections (check your grounding wires).
Ahhhh. Thank you. Main battery replaced <1 yr ago.
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post #10 of 11 Old Today, 01:38 AM Thread Starter
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Originally Posted by Azrielsc View Post
I had a similar issue (engine temp almost never went up to normal operating temp) and in the end, it threw an engine check light.

After the thermostat & hoses were replaced, everything is now fine.
Same here (thermostat only.)
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