[Nickshu]

Originally Posted by JFP in PA

A VERY bad idea. People have been talking this up for years, while those that have actually tried it quickly found out where it comes apart, literally.

These cooling systems are designed to run at a maximum pressure that is quite low, less than 20PSIG. Try to push out the coolant, they find out that it is actually rather slow, so they jack up the pressure, stressing both soft and hard coolant lines that run the length of the car, the radiators, and the heater core as well. Then they refill the system and suddenly find leak everywhere. Now you get to spend anywhere from hundreds to thousands of dollars to replace those long coolant lines and radiators.

The system came from the factory with drain plugs and hoses that are easy to disconnect and then reseal. Gravity drain the car by pulling the drain plug near the water pump, and disconnect the lower water pump hose; most the coolant will all be out in about 5 min with no damage. If you want, refill the system with distilled water and repeat the process to flush it out. But do not put it under pressure.

Sorry but I disagree. I've done it more than once with no problems. The procedure uses only 8-10psi pressure which is far less than normal operating system pressure. Also my understanding is that the ONLY way to get the coolant out of the heater core is using air pressure, it cannot be drained.

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