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 Quick Q about radiators and thermostats:
				
				
						
							
							
						
						
				
					
						
							My '91 celica GTS (w/ 194K miles) is still around, but the water in the upper radiator hose is boiling when i drive.  I notice it when i shut it off.  Is this a sign of the thermostat going south?  The temp. guage shows normal temps while driving.
Any thoughts?  
TIA.
						
					 
					
				 
			 
			
			
		 
	 
		
	
 
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							First thought : Radiator cap
						
					 
					
				 
			 
			
			
		 
	 
		
	
 
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							Plus make sure the system is completely filled.
						
					 
					
				 
			 
			
			
			
			
		 
	 
		
	
 
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 Originally Posted by 
joe.MIATA
					
				 
				thanks
			
		 
	 
 Well what did ya figure out???
						
					 
					
				 
			 
			
			
		 
	 
		
	
 
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							nothing yet- only that the original radiator cap didn't fit perfectly onto the after-market radiator i installed last summer.  However, i don't have any leaking from the cap.  I guess it's possible that a 15 yr old cap could be tired.  I will try to find a new cap tonight.
Haven't tried to remove the cap yet because it takes hours for it to cool, so i haven't checked the fluid level.
I'll post my findings.
						
					 
					
				 
			 
			
			
		 
	 
		
	
 
		
		
		
	
 
	
	
	
	
	
	
	
	
	
	
	
	
		
		
			
				
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