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engine cooling system pressurizing hoses and foaming

Sent to Car Experts April 20 01:46 PM

89 gmc van, 350 ci.             new radiator, new antifreeze,          starting up cold, antifreeze looks good, with in minutes it is white and foamy.    have to put cap on to keep it from overflowing,          top hose gets hot and is hard from pressure.   temp gauge stays basically cold........not much heat at all from heater.        both heater hoses seem to be hot.                      idle stay fast.          put new heat computor sensor in. no different..................Cars seems to be overheating and not showing any temp increase.                        all foaming in antifreeze goes away when cold   does not seem to be dirty or contaminated.............Put all new in and flused        still the same.           Help

 

Optional Information:
1989 GMC van 350

Already Tried:
new radiator, new antifreeze, new temp.computor senser

Customer (name blocked for privacy)
Status:  Closed   Value: $20
Answer
April 20 6:53 PM (5 hours and 7 minutes and 35 seconds later)
         
ACCEPTEDCheck Mark
You have combustion gases entering the cooling system.The most common cause is head gaskets or a cracked head.You could have a cracked engine block also.A shop could verify this for a small fee by doing a chemical block test on the cooling system.

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