Transmission temperature reading low

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Dec 16, 2015 | 06:34 AM

msgtord

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From: Arizona/Texas

Transmission temperature reading low

With the colder temperature, I noticed the temperature for the transmission is not getting up to normal as quickly as before. Yesterday I switched to gauge mode and it showed 145 degrees after 20 miles of driving at an outside temperature of 42 degrees.

Does anyone know what the minimum temperature should be? It's not showing a check engine light and shifts good.

Thanks.

Dec 16, 2015 | 06:40 AM

redford

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From: Stephensville WI

Minimum temp would be ambient air temp. You're over thinking this. Too hot is bad. Everything else is OK.

Dec 16, 2015 | 01:40 PM

davester250

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unless it's cold enough that the fluid is frozen solid...but then most people would have different worries...

Dec 16, 2015 | 02:17 PM

Bently_Coop

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From: Kent Station, WA

140° +/- is about right. Ambient + 80-100° is where you should be.

Dec 16, 2015 | 04:02 PM

Tom

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From: Isanti, MN

Quote:

Originally Posted by Bently_Coop

140° +/- is about right. Ambient + 80-100° is where you should be.

Not for this one, the 6R140 has a thermostat that regulates its temperature.

Quote:

Originally Posted by msgtord

Sounds perfectly normal to me. The transmission takes much longer than the engine to come up to temperature, and that gets worse in cold weather. The 6R140 in my '11 would settle in around 195 degrees, but not for at least 30 miles in cold weather. My new F150 behaves very similar.

Dec 16, 2015 | 05:53 PM

msgtord

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From: Arizona/Texas

Quote:

Originally Posted by Tom

Not for this one, the 6R140 has a thermostat that regulates its temperature.

Sounds perfectly normal to me. The transmission takes much longer than the engine to come up to temperature, and that gets worse in cold weather. The 6R140 in my '11 would settle in around 195 degrees, but not for at least 30 miles in cold weather. My new F150 behaves very similar.

Thanks. I'm just accustomed to older transmissions that warmed up allot quicker. I don't remember it taking this long to warm up last winter and we spent some nights in the teens.

Thanks again.

Dec 16, 2015 | 06:05 PM

Tom

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From: Isanti, MN

Quote:

Originally Posted by msgtord

Thanks. I'm just accustomed to older transmissions that warmed up allot quicker. I don't remember it taking this long to warm up last winter and we spent some nights in the teens.

They really didn't, they just looked like they did. The previous generation transmission temperature "gauge" would read mid-range normal when the trans was above 50 degrees. Every truck I've ever monitored temps on has taken >20 miles for the transmission temp to come up and stabilize. Older designs didn't use a thermostat and would settle in a temperature dependent on load conditions, volume of air through the coolers, and ambient air temp. Modern transmissions are much more consistent and will come all the way up to temperature even in the middle of winter.