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Thermostat To Use with the Transmission Cooler Portion of the D15902

Question:

I will be installing a Derale Combination Transmission and Engine Oil Cooler kit D15902. This comes with some fittings and apparently 2 different size hoses. Apparently this does have a thermos control in the sandwich adapter for the engine oil but no thermo control valve for the transmission fluid system. Therefore I plan to also install a thermo control valve for the transmission fluid system. Regarding Derale Fluid Control Thermostat Kits D13011 with 3/8” NPT ports and hose barb fittings and kit D15719 with ½” NPT ports and hose barb fittings What is the purpose of the 2 different size ports in these valves? Are the hose barb fittings on each of these kits different sizes and if so, will either of them fit the hoses for the transmission fluid system in the Transmission and Engine Oil Cooler kit D15902? Please advise a.s.a.p. – and thank you.

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Expert Reply:

The thermostat unit to use with the # D15902 that you have planned on installing is the part # D13011. If you check out the install video I attached you will see both of these products being installed on a similar Toyota vehicle.

The difference is the diameter of the threaded portion of the barbs and not the actual barb itself that the hose attaches to.

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Jameson C

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