The engine block heater is designed to heat engine coolant for more efficient starting during cold weather temperatures. The block heater is generally located on the roadside of the engine. The component is installed to provide a heating element into the engine coolant. A cord is noticeable at or near the rear cap. To engage the engine block heater it will be necessary to plug in that cord.

Block heaters are rated in watts ranging from 750 to 1500. It is strongly recommended that the motor home is plugged into shore power, or that the generator is running when operating the block heater. On certain models the inverter can be used to power the block heater receptacle. However, relying on the RV batteries to supply power to the engine block heater can quickly drain the batteries.

Use caution when plugging the block heater into a house outlet using an extension cord. A 1500-watt block heater will require a 20 Amp breaker and the cord used must be rated to handle that type of current. If the block heater fails to operate, check the breaker switch at the 120 Volt AC panel, usually located in the bedroom.

Operate the engine block heater when outdoor temperatures reach 32 degrees F., and lower. For optimum heating time, allow the block heater to warm the coolant overnight. Three to four hours heating time is the minimum amount necessary to warm coolant enough to start the engine.

Using the engine block heater when outdoor temperatures fall below freezing is a very good idea. When attempting to start an engine during cold temperatures without the aid of a block heater, thicker oil and rotating parts are sluggish and reduce the cranking speed of the engine. Use of the engine block heater will help raise the temperature to more efficiently engage the engine on demand.

You can add an engine block heater as an after market item to diesel and gas operated motor homes. If you frequently use the motor home in cold weather climates, consider the addition of an oil pan heater and/or a battery heater for additional heating capacity to operating components.