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2003 Silverado Silverado Coolent Loss

chevydriver26

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chevydriver26 New Member

chevydriver26

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Hello im new to the sight looking for some help.. about 2 months ago i bough this 2003 silverado 1500 4wd 5.3l 105,000 miles and im haveing coolant loss issues. its going threw about a half gallon every week to 2 weeks depending on highway driving. thiers no visable leak already replaced the water pump due to pully snaping of the pump. hopeing that would fix it NOPE. no oil and coolant mixing trans fluid looks good no sign of a heater core leak.. have a few codes for sensor 2 knock sensor , evap canaster purge valve and a mass air peformance code.. im not worried about all that at this second just conserned with the coolant loss truck seems to have normal smoke in the mornings till it warms up and then nothing. is the only other option head gasket ? i was told these dont have a lower intake like in the older 5.7 were coolant passes threw. any help would be greatly appricated thanks

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
Hello im new to the sight looking for some help.. about 2 months ago i bough this 2003 silverado 1500 4wd 5.3l 105,000 miles and im haveing coolant loss issues. its going threw about a half gallon every week to 2 weeks depending on highway driving. thiers no visable leak already replaced the water pump due to pully snaping of the pump. hopeing that would fix it NOPE. no oil and coolant mixing trans fluid looks good no sign of a heater core leak.. have a few codes for sensor 2 knock sensor , evap canaster purge valve and a mass air peformance code.. im not worried about all that at this second just conserned with the coolant loss truck seems to have normal smoke in the mornings till it warms up and then nothing. is the only other option head gasket ? i was told these dont have a lower intake like in the older 5.7 were coolant passes threw. any help would be greatly appricated thanks

 

 

Castech Heads - http://www.gm-trucks.com/forums/index.php?...57746&st=25

chevydriver26 New Member

chevydriver26

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thanks for the link just read threw the threads i am also having smiler problems "loud valve noise " periodically in the morning lasting almost 2 to 3 mins. havent pulled the covers but i can only assume the worse that i have the bad CASTECH heads .. so now i haft to look for heads most likely any poss places to get a decent set of heads i dont wanna get them from a junk years ill probably get heads with the same issue

DeePa Enthusiast

DeePa

Posted
Posted
thanks for the link just read threw the threads i am also having smiler problems "loud valve noise " periodically in the morning lasting almost 2 to 3 mins. havent pulled the covers but i can only assume the worse that i have the bad CASTECH heads .. so now i haft to look for heads most likely any poss places to get a decent set of heads i dont wanna get them from a junk years ill probably get heads with the same issue

 

 

http://www.gm-trucks.com/forums/index.php?...&hl=castech

 

 

 

I went through this in June. Gotta pull the rockers to tell for sure.

 

 

Mike

chevydriver26 New Member

chevydriver26

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I got the bad heads .. I want to replace them as soon as possible. What should I look for for replacements? Foud a set of heads of a 2005 Yukon would these be ok or a set of a 2002 ? When was this problem corrected? Also if someone could give me a casting numbe for non castech heads I'd appreciate it or I was thinking of getting them from heads only .com any reviews I just don't want to get another set of bad ones and have this problem later on.. bone yeard wants 125 ec for the 05s and 175 for the reconditioned heads any more help would be awsome thanks

jblakeney Senior Enthusiast

jblakeney

Posted
Posted

Ditto probably Castech heads..... Pull it apart and look for the logo... wavery, put a good link showing the heads..

 

Jbo

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