Go to your nearest dealership and ask for a pack of this part # 3634621. These are coolant seal tablets. I added them to mine...and I'm cured. We put them in everything that comes in here with a mysterious coolant leak. They work and they are great! Use em'

 

Its the gaskets man!! At least on mine it was.

 

Mine has the same leak. I figured it was the water pump gaskets but it hasn't been leaking bad enough for me to want to mess with pulling everything apart. Maybe I'll fix it in a few weeks and throw in a cam at the same time. Anyone know the part number for the new gaskets?

 

It takes about 45 minutes total, just make sure the surfaces are absolutely clean before re-installing the pump.

Sorry don't know the part number.

 

Part number that you are looking for is 12559271....they sell for a whole $4.00

 

Thanks for the part number, but $4.00 I don't know if i can afford it

 

i know mine leaks BARLEY out of the side of the Radiator where the press it and the side tanks together..

 

My brothers is an '03 and it is leaking also. Guess we will have to get some gaskets. What do the seal tablets do?

 

**** up the cooling system IMHO....get the gaskets and a 6 pack, you will be done in 40 min.

 

In 11 years of using GM coolant system seal tabs....I have never once had a comeback or a single problem with them ******* anything up.

Look...all they are is crucjed up walnut hulls with a collant reactive sand. Forms a hard seal when it been liquified and then exposed to air.

Millions and millions of GM engineers and cars all ove the world can't be wrong.

But that's IMHO