Thanks for your reply.
Which G-05 coolant did you switch to? The Formula 1 Motomaster "G-05" compatible coolant from Canadian Tire in the gold jug? I used this a few years ago but noticed it was leaving powdery residue in several connection points (i.e. hoses, t-stat housing, reservoir) which were never touched/removed. And this was on 2 Volvo 850s. I have since switched back to Volvo coolant and didn't have this residue problem.
I noticed that Canadian Tire pulled out this coolant from the shelves earlier this year and this made me wonder if CT's G-05 coolant is really G-05 compatible.