water pump in and working...still minimal heat from the vents.

chalky stuff is caked everywhere. what is this stuff? I started a new thread asking that question to see if anyone knows. it cant be good.

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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