Just want to share something I saw this week. I replaced the thermostats and noticed that one of the ports into the thermostat housing was plugged. Thought is was scale, but eventually I realized that it was a bit of impeller.
So, if you have a 3QM30, when you find that bits of you impeller are missing, you may want to check this spot.
So, if you have a 3QM30, when you find that bits of you impeller are missing, you may want to check this spot.