Does Transmission Cooler Need Temperature Bypass for 2017 Mercedes GLE400
Updated 01/27/2026 | Published 01/01/2026
Question:
Can I put a transmission cooler on 2017 mercedes gle400 with 9spd transmission. Need a thermostatic bypass 180 degrees... I think. Transmission is temperature sensitive. Is there a recommendation? How to install? Thanks
asked by: Thomas H
Expert Reply:
Hey Thomas, this a great question but you do not need a thermostat bypass for your transmission fluid to allow it to heat up to a certain temperature before allowing it to cool. Unlike engines the transmission doesn't really need to get up to an operating temperature before it functions well. Basically you can't overcool transmission fluid (within reason).
Product Page this Question was Asked From
Derale Stacked-Plate Transmission Cooler Kit, -6 AN Inlets - Class IV
- Transmission Coolers
- Stacked-Plate Cooler
- Full-Size Truck
- SUV
- Standard Mount
- 13W x 6-7/16T x 2D Inch
- With - 6 AN Inlets
- Derale
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Jameson C.
1/27/2026
Hey Thomas, how did things go with adding the transmission cooler to your GLE400? I'm curious if the setup worked well without the thermostatic bypass. Your update could make it easier for others working on a similar transmission.