Discard GE-52098 Coolant System Pressure Test Adapter

Do not use the GE-52098 Coolant System Pressure Test Adapter when servicing the cooling system on 2017-2018 Silverado and Sierra models equipped with the 6.6L Duramax diesel engine (RPO L5P).

Remove the GE-52098 Coolant System Pressure Test Adapter (Fig. 5) from your tool inventory and discard it. A replacement adapter (GE-52098-A) will be shipped at no charge to your dealership.

Fig. 5

Until replacement units are shipped, the GE-52098-A adapter (Fig. 6) is available through the GM Loan Tool Program. Dealerships must access the Special Service Tools website through the GlobalConnect link in order to enable the Loan Tool button.

Fig. 6

The GE-52098-A adapter has two seals and an extended component that close off the vent chamber portion of the surge tank. Without these two seals, the adapter cannot properly evacuate the cooling system because air will leak back in from the atmosphere vent cap on the side of the radiator surge tank.

– Thanks to Chuck Berecz

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