You might try this 1st.
1. Disconnect both transmission lines from the trans thermostat.
2. With compressed air, blow out the transmission cooler lines, blowing thru the return line with a jug container on the outlet line, and see if any debris is in the jug. I used a clear plastic drink bottle to catch the fluid & then looked to see if it caught any debris.
Note from AI.....On your 2017 Chevrolet Silverado 1500 5.3L with the 6L80E, the transmission fluid flow is:
Upper cooler line at the transmission = Hot fluid OUT to the radiator/transmission cooler.
Lower cooler line at the transmission = Cooled fluid RETURN back into the transmission.
At the radiator/auxiliary cooler, the fluid typically flows:
Out of the transmission through the upper line.
Through the radiator heat exchanger.
Through the auxiliary cooler (if equipped with the factory towing package).
Back to the transmission through the lower return line..
Then with the thermostat removed, I installed a thermometer defeat (bypass) that bought off Amazon. This one has no moving parts.
Yeah, they’ve really been hitting it hard with the R&D. If their oil wasn’t performing as well as it has been for people I’d say this just a cash grab/ marketing ploy. But the BITOG folks seem to think this may be legit too.
Trying it in the Jeep, fuel has been a problem in the samples and while I have new injectors on the shelf, this is an easier proposition…
Just cruising around this holiday weekend. Been working on her every spare minute for the past two months. Still lots to do but sometimes you gotta stop and smell some flowers!
Old school guys will appreciate the rock crusher whining away. Such a nostalgic sound.
Purists may disagree but I like to think I hit a good blend of modern and retro with this car and did it my way.
I have 2018 Suburban with 6L80 Trans. Recently started seeing temperatures as high as 270F with normal driving on highway or even around town after an hour of driving. I am wondering if this is a Trans temperature sensor problem. The trans cooler lines into and out of the radiator are at 150F. So my thinking is one of the following. 1) Thermal bypass valve malfunction, 2) Clogged or partially clogged trans cooler lines, 3) malfunction in the report of the temperature. I intend to replace with the newer 85585333 GM bypass valve. But I am wondering if anyone else has experienced this situation. I can't find anything on the internet about temps for this trans this high.
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now