Good evening,

Put the requisite 2.2lbs of citric into my radiator (after properly do-oiling and flushing) and now I have no heat (monovalve wire disconnected - so I would usually be roasting).

What could have changed to cause this?

A little history:
-Earlier today I replaced the radiator (after the neck broke). Filled with plain water and went for a 20 mile test run. No problems and temp sat right at 85-90. Perfect.

-Flushed and dissolved citric into warm water and poured it in the expansion tank. Idled the car and temp began to climb past 100(!). Figured I had some air - burped system (put on incline, remove rad cap, put heat on, rev to 3k, repeat three times) and added more water and the temp stabilized. Heat was fine at this point, not as hot as before, but OK.

-Went for another drive tonight, turned on heat at end of ride and it wasn't there - had been there in the beginning of the ride. Noted my expansion tank water level is low (not visible in tank), will fill tomorrow morning. I had topped it right before that ride.

- no apparent water leaks, no coolant in exhaust. Could my system still be purging out air somehow? Could my heater core be blocked by stuff being removed by the citric?

Many thanks,
dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car