You should never attempt to bleed your a/c system unless your are quailfied, the reason why is there is a low pressure side and high pressure side to your a/c system, and besides the fact that knownly releasing the coolent gas in to the air is a crime punnishable with fines, because it bad for the enviorment and to your health. if you don't do it correctly and release the high pressure side your very likely to injure youself. Beside the odd that the coolent gas is used up is slim, normally if your a/c isn't working anymore it mean you have a leak in your system and the gas has escaped.
The cooling system is bled using the bleeder screw found on the thermostat housing. To find the thermostat housing on a 1998 Honda Civic follow the lower radiator hose to its outlet. While the cooling system is running loosen the bleed valve. When bubbles stop coming out the system has been bled.
Is there a air bleed screw along the top hose? Alot of vehicles will have one. It usually has a place for the square shaped sockets. Undo this screw and fill until fluid comes out of this bleed hole. This pushes air out of the highest point of the system.
If you are talking about a 1998-2005 Passat there is a bleed hole in the cooling system for this purpose. The heater coolant lines pass through the second firewall remove the clamps on the lines and pull them toward the front of the car about an inch. One of the lines has a little hole for bleeding the system.
It is best to have it done professionally as they clean the cooling system as well as back flush it.
It everything was done correctly plus the controls are working then you will have an air pocket in the cooling system and you must bleed the system out to remove it..........
It is important to have a diagram of the area of the car that is being worked upon. The cooling system diagram for a 1998 Dodge Dakota is found in its maintenance manual.
More than likely the cooling system has an air bubble in the heater core. check to see if the radiator is topped off with anti freeze, and look in your owners manual for cooling system bleed procedure. sometimes, even if the radiator is full, there will be an area that will not bleed the air, so the engineers designed in a bleed port which is sometimes located on the thermostat housing or in a heater hose. hope this helps
You have to drain the system via the bleed screws on the calipers. Then, after refilling the system with fresh fluid, you need to bleed the system to remove any air.
The cooling system helps keep the car from running too hot. A diagram for the 1998 Ford Taurus cooling system can be found in the car's maintenance or repair manual.
To bleed the coolant system on a 1998 VW Beetle, remove the top from the overflow tank. Run the car for 10 to 15 minutes to force any air out of the system, then check the coolant level. Add coolant as needed.
17.5 qt capacity
The cooling system in the 198 Expedition includes the radiator and its reservoir along with the thermostat. This system included an oil cooler as well, depending on the model purchased.