A low-tech test is to observe the liquid in the radiator top tank with the engine running and warmed up (loosen or remove the cap before warming up the engine). Leaks may show up as bubbling/foaming. I think the cooling system can also be tested for leakage by pressurizing the system with a special tool that locks onto the radiator tank opening, contains a pressurizing pump and a pressure gauge. Pressure bleed down may indicate leakage into the cylinder. Rich Barber Brentwood, CA From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Matt Allyn Sent: Wednesday, September 29, 2010 7:46 PM To: Chrysler300@xxxxxxxxxxxxxxx Subject: [Chrysler300] The Head Gasket What is the testing procedure to determine if one has a cracked head gasket? It's has been rather HOT here in Southern California lately....so I am concerned with how my temp gauge is reading; even when driving home in the cool, cool, cool of the evenings. Thanks! Matt Allyn [Non-text portions of this message have been removed] No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.856 / Virus Database: 271.1.1/3165 - Release Date: 09/29/10 12:50:00 [Non-text portions of this message have been removed] ------------------------------------ To send a message to this group, send an email to: Chrysler300@xxxxxxxxxxxxxxx To unsubscribe from this group, send an email to bob@xxxxxxxxxxxxx or go to http://autos.groups.yahoo.com/group/Chrysler300/join and select the "Leave Group" button For list server instructions, go to http://www.chrysler300club.com/yahoolist/inst.htm For archives go to http://www.forwardlook.net/300-archive/search.htm#querylangYahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Chrysler300/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Chrysler300/join (Yahoo! ID required) <*> To change settings via email: Chrysler300-digest@xxxxxxxxxxxxxxx Chrysler300-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: Chrysler300-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/