Buy 1990 Buick Century Seal. Pipe. Coolant. Engine. Passenger. Bypass Hose. O - Ring. (Upper). 6.6 By-pass, Cooling, DIESEL - OEM Buick Part # 12658352

A component which prevents a leak at the Cooling System Bypass Line. Bypass Pipe to Lower Thermostat Housing. O-Ring. Included with: By-pass Pipe.

Engine Coolant Pipe O-RingEngine Coolant Bypass Hose Seal

Fits Sierra 2500 HD, Sierra 3500 HD, Silverado

6.6 LITER DIESEL.
Cooling System Bypass Line - Repair or Replace
If your 1990 Buick Century has been either leaking coolant or overheating, you could have a faulty cooling system bypass line. Let our technicians help trace the problem and replace the faulty coolant hose with a genuine Buick part.