Installing an Engine Block Heater

An engine block heater is designed to reduce stress on your engine during cold weather. The heater warms up the oil or coolant, making it much easier to start a cold engine. Additionally, the typical passenger automobile engine operates most efficiently at approximately 200 degrees F. Using an electric heater allows the engine to reach this temperature much more quickly. It can improve your vehicle's fuel economy by approximately 10 percent in the winter. The heater plugs into a typical 110 volt alternating current outlet. Consider installing an automatic outlet timer, because it is only necessary to heat the engine for about 2 hours before driving.

There are several different types of engine heaters available. The specific one you choose will depend on the make and model of your vehicle as well as your mechanical ability. The simplest kind of engine heater replaces the oil dipstick. A slightly more complicated type of heater splices into the upper radiator hose. It can be installed in a matter of minutes with a screwdriver. The most effective engine block heaters replace a drain plug on the bottom of the engine block. General installation instructions for this type are listed below.

Step 1 - Jack Up Vehicle

Working on a cold vehicle will protect you from burning yourself, but working on a warm engine makes it slightly easier to remove the drain plugs if they are made of a different metal than the engine block. Choose the option you are comfortable with. Engine heaters come in different wattages, so select one that meets your needs and is compatible with your vehicle. Jack up the front end of the vehicle and remove the plastic engine cover.

Step 2 - Drain Engine

Refer to the owner's manual for instructions specific to your equipment. Remove the clips holding the radiator cover, and the bolts holding the radiator mounting bracket. Slide a pan under the engine and pull out the specified drain plug, usually at the rear of the engine block. Remove the radiator cap to accelerate drainage.

Step 3 - Plug in Heater

Prefit the connection between the heating rod and the power cord, in case you have to do it blind later. Drop the male end of the cord into the engine department. Lubricate the hole or rod with grease, up to but no further than the metal clip. Insert the rod into the hole. If trapped air is presenting resistance, displace it with more grease. The metal clip should face the rear of the vehicle. It will make an audible snap when the heater slides into place. Some types have to be tightened with a wrench to a specified torque.

Step 4 - Route Power Cord

Plug the cord into the rod. Run the wire harness through the engine compartment and out the front grille. Follow the included directions or improvise. Avoid moving parts and hoses. Once the cord is in the correct position, secure it with wire ties. Leave no slack behind the first tie; keep the cord off the engine manifold.