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			I had a similar problem with my 603 motor.   The system held a LOT of pressure, sometimes for days.  Turns out I had a cracked head.  By the time the new head, gasket, valve job, etc were installed, I was looking at a $5k repair bill. 
 
I hope you are not in the same boat, but if you are, just remember once it's fixed, it should stay fixed for a LONG time. 
 
Best of luck!
			
				
			
		 
		
		
		
			
		
		
		
		
		
			
				__________________ 
				Lance Allison
       Lance@LanceAllison.com 
   
Current: 
11 MB S550 4Matic, 55k miles, Designo Black/Black 
14 Ford F150 XLT Lariat Crew, 73k miles, 5.0  
     Coyote V8 4x4.  Black/tan. 
09 GMC Envoy Denali, 5.3 V8, 4x4 SWB. 38k miles,  
     Jewel Red/Med Gray.
 
Gone:  
87 MB 300SDL, 320k miles, Astral Silver/Blue. 
98 VW Jetta TDI, 488k miles, Classic Green/Gray. 
85 Olds 98 Brougham FWD, 4.3 DIESEL V6, 80k  
     miles, 3x Gray.
 
MBCA Member, Chicago Region
			  
		
		
		
		
		
	
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