Date: 26 Jul 2006 15:02:47 GMT
From: John B <rotten_NOSPAM_nospam.org>
Subject: Re: Cooling System Dilemma - '92 900i


On 26 Jul 2006 08:12:09 -0700, robanzellottinospamlemail.com wrote: > only started leaking after I changed the water pump. Could it be that I > somehow have too much pressure in the system, and that caused the valve > to fail? How is excessive pressure released? As I said, I only am > overheating at highway speeds. The system is supposed to be under pressure when the engine is hot. Excessive pressure is released by exploding hoses :) Running only water in the system could conceivably have caused the leak, as it boils at a lower temperature than coolant and could have caused excess pressure to escape through the bypass valve. So I think you should probably drain the water, put in a new thermostat (and maybe radiator), replace the failed bypass valve, and fill up with properly mixed coolant. With a new thermostat and radiator, I think overheating is unlikely to happen. John -- Posted via a free Usenet account from http://www.teranews.com

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