The coolant will only flow to the radiator when I remove the radiator cap. The engine is losing coolant but there is no evidence of a leak in the hoses or the radiator. I suspect the intake manifold or head gasket. The radiator is bone dry after even a short trip to work and back (10 miles). The resevoir remains full until I open the cap on the radiator, then the coolant flows freely.
What would keep the coolant resevoir from flowing to the radiator? on 2002 Buick LeSabre
Don't drive it .recommend towing it to a reputable shop for proper diagnosis. Sounds like it might be best to see what it's doing first-hand.
have the cooling system pressure tested at a good repair shop
Ziptie and Global Helper are correct to not dive and have it checked.