Coolant System Mysteriously Pressurizing

[danc30]

Glad to report that the system re-pressurized.

I'm very glad it did. It means that there is some type of chemical reaction between the UV dye from Tracerline and either the Water-wetter, anti-freeze, or something else.

I will drain, flush and refill without the dye.

Thanks again to all of you that assisted in this diagnosis.
Kudos go out to patrickt and Ronbo

Originally Posted by patrickt

I think I would just loosen my plugs and let the pressure out of the cylinders and pull a cable off of the battery, and then when the engine has cooled off put the cap back on it and see if it continues to build pressure while it's just sitting there in the garage. If it does then it has to be a chemical reaction.

Originally Posted by Ronbo

The dye may be reacting with the water-wetter. The dye was probably never tested with the water-wetter for issues in the first place.

I'm really glad I don't have a blown head gasket.

Rule of thumb- Start with the simplest possible reason for an issue and go from there.

Dan

[patrickt]

Originally Posted by danc30

Rule of thumb- Start with the simplest possible reason for an issue and go from there.

Dan

Ain't that the truth.

[RICK LAKE]

danc30 Dan What color is the coolant? Green, Orange, Wierd Purple? I do know from GM that there are 2 different dyes for the coolants, Green and Orange. I run 50/50 orange and 1 bottle of wetter with dye and didn't have the problem you had. Gald you found it and have the fix for it. Rick L.