RickB
Super Star Member
- Joined
- Sep 18, 2000
- Messages
- 15,205
- Location
- Up the road from Dollar General WNC
- Tractor
- Just a Scag
I can't see why a bubble would form there. It's in the middle of the block. It should help cool the element with the coolant circulating. . I sometimes Idle the engine with a block heater still plugged in always wondering if it will heat up faster.
But, I won't do it, until I get a good answer.
I agree. The water pump pushes water INTO the block from the lower radiator tank. That means the coolant in the block is under positive pressure. If the block is free of air pockets, it will stay free of air pockets. Flow will be super low at startup due to the thermostat being closed; the only flow out of the engine will be via any coolant bypass. I call the heater MFG's warnings an unnecessary CYA stunt.