Ran it until it got 'hot'. Turned on defrost, 90, full blast...took off cap and bleeder and ran it until I could see no bubbles and fluid was pouring out. Drove to work. Left at 90 in AUTO, and it stayed fan level 'ONE', defrost and floor the entire time. Immediately did diagnostics after stopping car. Showing 'WATER TEMPERATURE' of only 76. So, I'm assuming I've either got a plugged core or the valve isn't opening. Hoses going into heater core were ok, but lower than operating temp by 20-30 degrees. Perhaps indicative of no water flow. I plan on pulling the hoses from the back with car pointing slightly downhill (driveway slightly sloped) and flushing core to see if something isn't flowing.
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