Just wanted to make sure I understand the necessary conditions for coolant to be flowing through the heater core.

If the following are true:

1. Key to Glow Plug On position

2. Cold Engine

3. Heat Set to Max

4. Fan Set to Max

Then coolant with flow through the heater core....even though engine is not running and coolant is cold.

Is this correct?

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 75k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife