# Most residential water supply networks are 30-40psi at the faucet.. but good luck stuffing a water hose in a radiator and holding enough water back to get the pressure that high. nm

Posted by Matt (93SE) on September 20, 2004 at 08:10:06: In Reply to: considering that the radiator cap is good to 14-18 psi, i doubt it'll ever get that high with a garden hose. nm posted by Alex on September 20, 2004 at 07:24:34: : : : : Hi Guys, : : : : Hot damn, my engine block drain plugs are seized! I had planned on flushing my coolant today, but I didn't feel comfortable using fire to try and unseize them. So do you guys know of another method I can follow to flush coolant that doesn't: a) Require me to drain the engine block plugs, and b) Unscrew the radiator drain plug (I don't trust plastic plugs being durable)??? : : : : Could I unattach either the lower rad hose or the thermostat hose to drain? Replys:

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: : : : : Hi Guys, : : : : : Hot damn, my engine block drain plugs are seized! I had planned on flushing my coolant today, but I didn't feel comfortable using fire to try and unseize them. So do you guys know of another method I can follow to flush coolant that doesn't: a) Require me to drain the engine block plugs, and b) Unscrew the radiator drain plug (I don't trust plastic plugs being durable)??? : : : : : Could I unattach either the lower rad hose or the thermostat hose to drain?