I have never had a problem, nor have ever heard a block heater failing because the engine is running. It's there all the time anyway, should not matter if it has current running through it.
All my block heaters have fared well, the oldest one is in my winter beater, a car sold in 1986 and the block heater was installed at the dealer. That's 18 years of use next summer!
-Axle
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What did i do last nite?
I had a wonderful time,
That's what they tell me
What did i do last nite?
1979 C-10 shortfleet: Olds 350, Th400, 12 bolt
Current project: 1969 Olds 455 W-30, needing a rebuild
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