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Old 03-07-2013, 11:38 AM
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doru doru is offline
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Location: Calgary
 
Join Date: Sep 2007
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Mein Auto: 2003 530iA
Quote:
Originally Posted by mifesto View Post
people here dont understand the cap doesnt cause pressure, the heat does. heat is produced and maintained by thermostat opening and closing to route water to the radiator. rad cap is simply a safety device to allow pressure to escape if necessary. venting in a car ejects precious coolant and introduces air into the system; this is NOT the solution to lower pressure. lowering temperature is the ONLY way to reduce pressure of a ethylene glycol/water mixture. this total failure of people's understanding may be especially bad for the 540is(as they run hotter) and hit that 1.2 bars sooner then the i6 guys.
Never said it reduces pressure in the cooling system.
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