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Old 11-02-2009, 03:10 PM
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Transmission fluid hot

Here we go...Just rebuilt a 4L60E transmission on a 2001 Suburban. I am receiving a message (not an error code) on the dash that the fluid is hot (only while driving about 70 MPH). Sometimes I can drive for an hour and sometimes 10 minutes before the message appears. Right when I pull off the road the light goes off. I continue on my way and maybe within 10 minutes or never the light comes on again. We have replaced the pressure switch since this problem started. The fluid is still red, clear and doesn't smell burnt. We are using Dexron III fluid and have flushed it completely as well. This problem is very inconsistant.
Any help would be appreciated.
Thanks

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Old 11-02-2009, 07:02 PM
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I'll start this off by admiting that my transmission knowledge is lacking....just ask anyone here. My first thought would be to hook up a temperature gauge to the test port on the trans, and see if the actual fluid temp is hot when your message appears, or do you know what the actual temp is? That would tell you if you are having an electrical glitch or an actual overtemp.
One of the knowledgable gurus here will probably chim in, but that is my thought.
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Old 11-02-2009, 08:11 PM
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You mention that the pressure switch was replaced.... would you elaborate on that switch? so I know you replaced the correct part.
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Old 11-02-2009, 09:05 PM
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Pressure switch

Hello,
The Transmission Fluid Pressure Manual Valve Position Switch is the switch I replaced.
Thanks
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Old 11-03-2009, 05:50 AM
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Quote:
Originally Posted by jjrkjnoslen
Hello,
The Transmission Fluid Pressure Manual Valve Position Switch is the switch I replaced.
Thanks

This is the switch on the valve body inside the trans pan? Not on the side of the transmission at the shift linkage?
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Old 11-03-2009, 06:51 AM
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Any chance you might have got the lines crossed from the tranny to the radiator?
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Old 11-03-2009, 06:58 AM
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Trans fluid hot

Hi ,, Sounds like a elec glitch guys, prolly wire pinch....2cts. 327 350hp Good Luck..
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Old 11-03-2009, 08:53 AM
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Crosley,
Yes, the switch is inside the pan.
Thanks
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Old 11-03-2009, 12:04 PM
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Quote:
Originally Posted by sqzbox
Any chance you might have got the lines crossed from the tranny to the radiator?

This would make no difference. A circle through the cooler is still a circle, no matter what the fluid flow direction.
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Old 11-03-2009, 12:22 PM
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Sqzbox,
I checked and they are hooked up right.
Thanks!
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Old 11-03-2009, 01:19 PM
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Two common issues I see with GM trannys that can cause that light to come on: overfilled transmission, and one of the speed sensors. Both can cause a trans temp light to come on. I'm not saying it makes sense, but it happens. Double check fluid level. If not, there is a speed sensor that fails causing that light to come on
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Old 11-03-2009, 01:29 PM
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Thanks, I will check the speed sensor out. The fluid level is good. Thanks again!
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Old 11-03-2009, 06:19 PM
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the temp sensor in the pressure manifold on the valve body does not go bad often , it does happen.

A quality scanner that is capable of reading the data stream live would show a temp reading.
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Old 11-03-2009, 07:50 PM
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Maybe it's not the tranny, but the converter.
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Old 11-04-2009, 08:27 AM
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torque converter

The torque converter is new, I hope it's not that! If it was the torque converter would it send a code?
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