The water temperature of Buick GL8 is high and the heating air is not hot.

Kopoity’s statement is purely misleading. The principle of warm air is to let the engine coolant pass through a specific small kettle, and then the air that needs to be heated is heated here and then enters the cab. When the internal circulation , there will be a specific fan that draws air from the cockpit and then discharges it back into the cab.

As you said, it may be a problem with the cylinder gasket. As for whether the cylinder gasket is stuck, after the car is warmed up, unscrew the plug of the oil filling port and see if there is anything sticky on it. Check again to see if there is white hot steam coming out of the oil filler port. If there is, it proves that there is a problem with the cylinder gasket or the cylinder head.

It will be normal after you increase the engine speed. Increasing the speed will cause the water pump to run at a higher speed, which proves that your engine coolant pressure is not enough. You need to check whether your antifreeze is always on. If it is constantly low, there are two possibilities:

1. Antifreeze is leaking somewhere in your tank. This is the worst possibility.

2. You have just changed the antifreeze. It is possible that the new antifreeze has not filled the pipe yet. You need to wait for the engine to discharge all the air in the pipe before it can reach the pressure it should be.

Just do as I said and check the engine oil first. I hope it's not a cylinder head problem.