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Old 02-02-2011, 08:34 AM
BethL BethL is offline
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Location: Minnesota
Join Date: Jan 2011
Posts: 5
Mein Auto: X5
Originally Posted by HPIA4v2 View Post
For that heater to work, it needs to be on about an hour or two before you start the engine/driving off, after parking on the open lot at work/mall/grocery store etc when temp is below zero for example.
It can't stay on all the time when engine is off or your battery will be dead.
Now if it's only on when you start the engine and you have frozen water/oil (oil always have some water in it) already, it won't do you any good cause the crank-case presure build right away.

I'm not sure we are talking about the same thing. This only heats when the vehicle is running, so there's no way to have it on for an hour before you start the engine. Perhaps there are different varieties.
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