Another option to keep the engine warm while you work on it is to plug in the block heater. (Obviously this assumes your car has one and the required cord.) This is especially helpful if you're changing all the glow plugs and thus taking longer than just one.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970