This guide provides information on installing an aftermarket transmission oil cooler, specifically the Davies Craig DC678, on a Toyota Land Cruiser Prado 150 series.
Problem
- Air conditioning pipe interference on newer models (e.g., 2017 2.8L diesel) when installing a transmission cooler in the factory location.
- Desire for faster transmission warm-up in colder climates.
Solution
- Air Conditioning Pipe Interference: Use a 3-inch spacer at the base of the transmission cooler to clear the air conditioning pipe. Maintain the top bracket mounting points under the horn mounts. This will result in an angled cooler installation.
- Faster Warm-up: Install a thermostatic switch, such as the Derale unit. It is installed inline between the cooler inlet and outlet, allowing a small amount of fluid bypass when closed (approximately 5%) to prevent hammering or airlocks. The switch opens at approximately 80 degrees Celsius.
- Alternative approach: Some users find the thermal switch unnecessary in warmer climates.
Relevant Parts
- Transmission Cooler: Davies Craig DC678
- Thermostatic Switch (Optional): Derale (check Ebay for availability)
- Mounting Brackets: Tin’s Brackets (Model dependent)
- Spacer: 3-inch spacer (for clearing AC pipe)
Results
- Expect a 15-20 degree Celsius drop in the automatic transmission pan fluid temperature after installation.
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