1984 300SD. when i glow the plugs the fan would blow. but when i crank to start it the fan will stay on for 1 second then cut off. not sure if t has anything to do with the heating system but it is at the heater setting. when the car is moving there is heat, just no fan.

i checked all the fuses and they are good. i would say it was a bad blower motor but it comes on when i glow the plugs. any ideas? thanks

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05