I can't say for 1.8s. For the V6, you'll have to drain some of the coolant, unless your the kind that just lets it run out all over the place.
Originally Posted by axenstar
Getting in behind the right bank head just blows, especially people with bigger hands, like me.I personally have not needed to burp the system after replacing the CTS.
There was at least one instance I had the intake manifold off my V6 for some other repair, even though it didn't need it, at that point in time I replaced the CTS just because it was that much easier.