Depending on the type of cylinder block, there are two types of coolant heaters used:
โข A flange mounted coolant heater, located at the rear of the engine on the exhaust side.
โข A threaded coolant heater, located adjacent to the lubricating oil cooler.
Disconnect the block heater electrical cord.
For flange mounted coolant heaters, remove the two block heater retaining capscrews.
Remove the coolant heater from the cylinder block.
For threaded coolant heaters, unscrew the coolant heater from the block.
Remove the coolant heater from the block.
