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'07 C280 4matic, '06 530i, '98 ML320
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1,562 Posts
about 20 to 30 minutes of highway driving. I don't how long it would take on local streets.
 

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'01-E320 & 02-ST2
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31,633 Posts
I'm assuming you want to check the fluid? Depending on outside temp, driving conditions, etc., well, who knows? If it's particularly cold, it might never really reach 80c driving around since there's no thermostat in the transmission.

A quick drive and letting it idle, partially blocking the airflow across the condenser (it's in front of the radiator) will always work to get it warm, but you still would only be guessing.

Best advice: buy a cheap infrared thermometer and just check it and wait until you get within a couple of degrees (you can aim it at the transmission pan, if it's 80 you know the fluid is). That's the best thing to do, then you are 100% sure. Harbor Freight had them starting under $25 last time I checked, they might be even cheaper now.

Good luck.
 

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681 Posts
Discussion Starter #5
Thank you gentlemen ,i appreciate your help.
I will follow your advice and buy infrared thermometer
 

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2000 Mercedes ML55 AMG, 2006 Mercedes ML350
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509 Posts
MY OBD scanner lists the transmission temp in the live data... you sure there is no thermostat?
 

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Purple Moderator
99 ML430, 00 ML320, 05 E500 4matic Wagon
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21,802 Posts
There is a temp sensor, but not a thermostat for the trans.
A good scanner like the Innova will read that data via the CAN.
 
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