Heater Craft Auxiliary Heater - Manual (Page 4)

Heater Engine Installation
(Continued)
Warning – Hot engine coolant can cause severe burns! Never open the cap on a hot radiator. Some
vehicles are equipped with electric fans that may start without warning even with he engine shut off. Wait
until the engine has cooled completely before installation.
Engine Installation (In series with existing heater)
1. Loosen the radiator petcock or remove the lower radiator hose and drain the engine coolant into a clean
suitable container.
2. Remove the existing heater.
3. Route a hose from the existing heater unit to the new heater unit.
4. Attach the return hose from the existing heater unit to the new heater unit. It makes no difference which
side of the heater core outlets to which hoses are attached.
5. Route a return hose from the new heater unit to the port where the return hose was removed from step 2.
Heater Unit Installation
1. Locate an area to mount the heater unit. Be sure the unit will be in an area with adequate air circulation.
Caution – The heater unit should be mounted below the level of the radiator cap. If it is mounted above
this level it is possible for air to be trapped in-line. If there is air trapped in-Line it will not allow the water
to circulate efficiently and may cause the engine to overheat. If the heater unit is mounted above the
radiator cap it may be necessary to install an in-line are bleed valve at the highest point.
2. Attach the brackets and mount the heater unit.
Note – It may be easier to make the hose and wiring connections before mounting the heater unit. Some
heater models are equipped with adjustable brackets for different mounting situations.
3. Cut the water/coolant hoses to length, attach them with hose clamps, and secure them in place.
Note – The hose clamps should be fastened near the end of the hose to prevent the hose end from
"mushrooming" and to prevent coolant leakage.
The hose can connect to either heater core outlet.
Be sure the hoses are not kinked or pinched in any way, and do not contact any moving parts, sharp objects
or edges.
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