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5
I
NSTALLATION
5.6.2
Engine and Passenger Compartment Heating
Potential skin and eye burn risk. When working on the coolant system, allow the engine and coolant to cool down
and open the radiator cap carefully.
Heater Cores arranged in Series
A series heating system works in this fashion:
Heated water (coolant) from the engine travels through the first heater core in the circuit, then on to the next heater
core in the circuit, and on to the next, etc. Each core adds some restriction, resulting in decreased water flow. Not
only is water flow reduced, but also water temperature is reduced by each successive heater core resulting in the last
core receiving water that is usually too cool to be effective. A fuel fired Webasto heater equipped with a high capacity
coolant pump can significantly increase the available heat supplied to a series plumbed system. The advantages are
increased coolant volume and flow through the system ensuring efficient interior heating through all heater cores.
Fig. 5-4: Series Plumbing Circuit - Conventional Model
Fig. 5-5: Series Plumbing Circuit - Transit Model (Engine Front)
5-4
W
EBASTO
WARNING
S
S
CHOLASTIC
ERIES
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