Buick Repair Questions? Ask a Mechanic for Answers ASAP
Can you give me the general area of the leak? Front? Passenger's side?
Ok. If it's in the area of the reservoir, this sounds like it may be a crack in the reservoir itself. It's easy enough to remove and check. There are 2 mounting screws holding it in place. Then it "pops" up from the base. If the reservoir checks ok, then the next step is to pressurize the system and the cap and try to pinpoint the root of the leak. You can rent a pressure-tester tool from most local big chain parts stores. When testing the cap, it should hold pressure for a minimum of 10 seconds. If the cap is good, pressurize the system. If the gauge drops, this is a leak. With the system under pressure, the leak should be more noticeable.
If it were the water pump, it'd be leaking down the passenger's side of the engine and puddling roughly in the area behind the passenger's front tire. If the reservoir is staying full, then the only other option in the front/passenger's side would be the radiator or a radiator hose. If this is the case, I'd strongly recommend the pressure test to ultimately confirm first, before replacement.
If there were any other questions you had on this, or any procedures that I can provide, please feel free to reply and ask!
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