If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Help please on changing anti-freeze
Many years ago I had a car which got a cracked block evidently from putting
cold water into an overheated engine. Ever since, I have been concerned about putting cold water into a warm engine. If you start with a cold car, drain the radiator and open the block plugs to get most of the anti-freeze/water out, then refill with cold water containing a flushing compound. there's nothing to be concerned about. But if you run the car for half an hour then drain it out again, according to directions, is it dangerous to then put in the new antifreeze and cold water? Or, is it a problem only when the engine has been overheated, for example from a lack of coolant. If you have this done professionally, they don't seem to worry about draining and filling a car which has just been brought in off the road. Any guidance on this would be appreciated. |
Ads |
#2
|
|||
|
|||
Rustler wrote: > > But if you run the > car for half an hour then drain it out again, according to directions, is it > dangerous to then put in the new antifreeze and cold water? Normally, the engine will have a thermostat that keeps the coolant temperature above a certain point (usually 180 or 190 degrees). It should be obvious that the coolant isn't going to be much higher than 200 degrees, since even pure antifreeze boils at about 240. Shut down and drain the system, and this will be roughly the temperature of your block. A temperature difference of 150 or 200 degrees isn't going to stress the metal that much. > Or, is it a problem > only when the engine has been overheated, for example from a lack of coolant. Bingo. Now you're talking differences as high as 1200 degrees. Especially with cast iron, that's enough to cause fractures. George Patterson |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
audis anti perforation warranty- REALLY DOES WORK | fiorello | Audi | 2 | September 18th 04 10:17 PM |
dodge durango freeze out plug | Delby | Dodge | 0 | July 30th 04 05:16 PM |
Freeze 12 in Chevy Blazer | Spiderman | 4x4 | 44 | May 28th 04 05:54 AM |
156 Selespeed 'clunk' changing into 1st gear | Mike | Alfa Romeo | 3 | May 8th 04 02:49 PM |