Transmission slipping

2006 CHEVROLET MONTE CARLO
133,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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JACOBY_YOUNG20
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I drove my car yesterday morning, noticed a difference but ignored, and parked the car. when I needed to get back in it I drove the car and it wouldn’t get up to speed it would get to 20MPH, then stall get to 40, then stall as well, and then sometimes when I’m at a stop it will not drive at all. well, today I had the filter replaced and fluid replaced and drove it around neighborhood and it was fine even got up in speed but sounds like fans are really loud.
Nov 30, 2021 at 8:31 PM
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KASEKENNY
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Just to be sure we are on the same page. You changed the fluid and filter, and the transmission is no longer slipping?

However, now the fans are roaring?

https://www.2carpros.com/articles/how-an-electric-cooling-fan-works

If this is the case, we need to make sure it is the fans and that they do this even after the engine is hot.

It is common for the fans to be loud when the engine is cold. So, I would suggest you take it for about a 20-mile test drive and see if the transmission is shifting properly and if the fans quiet down.

It is unlikely that this is related to the transmission issue but let's get a little more clarify on the issue and go from there.

If the fans don't quiet down, then I suspect we have an issue with the temperature sensor to keep the fans on high but let's get there after this is clarified.

Thanks
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Dec 1, 2021 at 6:39 PM