Oldsmobile 25774005 Tank Assembly, Radiator Surge

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To remove the coolant reservoir or expansion tank, start by draining the cooling system and removing the radiator support cover if necessary. Then, detach the hose from the top of the expansion tank and remove the radiator support brace and cross-vehicle brace if equipped. Disconnect the coolant level sensor connector and remove any relay mounting brackets or fuse/relay panels that may be in the way. Loosen the clamp from the lower hose and remove it. Finally, remove the mounting bolts or nuts and pull the coolant reservoir or expansion tank straight up and out of the vehicle. To install, clean the inside of the reservoir, scrubbing hard-to-reach areas with hot, soapy water and rinsing with clean water. Then, follow the reverse steps of removal and refill the cooling system if necessary.

No, the cap is sold separately

Yes, the surge tank does include a new sensor