2006 Chevrolet Colorado where to buy correct thermostat

KAIDEN650

MEMBER
2006 CHEVROLET COLORADO
156,000 MILES

So, I have replaced the thermostat. And truck was still running hot. So I took off the new thermostat and noticed it has a different bore size than the original (the original being the bigger). Napa auto parts is unable to order original size thermostat. Where can I purchase it? Part number is 12620113

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WRENCHTECH

MECHANIC
20,761 POSTS

I don't think that is real important but you should be able to get it from the dealer.

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Tuesday, September 10th, 2013 AT 11:17 AM

KAIDEN650

MEMBER
9 POSTS

I have changed out the entire cooling system, and sensors but it is still running too hot and almost red lining. It is due to the bore size of the thermostat. Through research I have found that the truck will be running hotter due to the bore size and smaller valve inside the thermostat. Dealership can not find original part. Was wondering if anyone on this site knew where to buy original thermostat online

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Tuesday, September 10th, 2013 AT 11:54 AM

KAIDEN650

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How could head gasket cause it to run hot? Would I loose coolant level if it was head gasket, or see some sort of leaking around the head? How would I check Head gasket myself?

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Tuesday, September 10th, 2013 AT 12:02 PM

WRENCHTECH

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You can check it yourself. The best to check it is with an exhaust analyzer sniffing for hydrocarbons in the coolant at the radiator.

It can be pumping hot combustion gasses into the cooling system, superheating the coolant and causing air pockets. I'm not saying it is. That's just one possibility that can't be overlooked. Overheating can be difficult to diagnose and you need a tech that knows what he is doing. This is a very common issue in South Florida where I am.

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Tuesday, September 10th, 2013 AT 12:17 PM