Quote:
Originally Posted by protusile
My 2001 Deville looses about a cup of coolant every 200 miles. I've had this problem for several months. I replaced the water pump and pump seal to try to fix the problem. I also added 3 GM stop leak pellets to the coolant system when I replaced the coolant. Three weeks later I added 5 stop leak pellets. But the coolant is still leaking. Apparently the leak is too big to seal with the tablets. There are no visible signs of a leak and nothing drips. Any suggestions?
I'm glad there is a coolant level sensor is the expansion tank or my engine would have burned up by now.
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Did you add the tablets to the expansion tank (where the radiator cap is)?
Coolant simply does not circulate through the expansion tank, so if the tablets were added there, they will simply sit there and do nothing.
All tablets must be placed inside the lower radiator hose, when the cooling system is empty. Crushing them helps, but is not necessary.
The specs call for 2 or 3 GM tablets, but on the advice of several Caddy mechanics, I added 6 to my car, with good results.