June 6, 2012Hey guy`s,
I want to know if anyone has used the GM#3634621 cooling system seal tabs to stop and internal engine coolant leak? I got a 4.8l and was lossing coolant internally for quite sometime. I pulled the driver side valve cover off and found that coolant is seeping in. I did some research and found out that this is a common problem with these engines 4.8l and 5.3l. I found a service bulliten and it recommended replacing the intire head. Well that kind of pricy. I went to a local shop and the guy`s there said try some of the GM seal tabs sense they recommend them with the caddy northstar engine. Also I thought about using the Bar`s sealant and looked at others as well but they don`t recommend it with the Dexrol coolant.
I just want to know if anyone has this problem and what did you do to solve it. I`m going to put the GM seal tabs in this weekend and I let you guy`s know how it turns out.