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© 2012 Mobile Climate Control T-299 Rev. 08/2012
1.9 HEATING CYCLE (If Applicable)
The optional heating circuit component furnished
by Mobile Climate Control is the side or rear
mounted evaporator heater core. Components
furnished by the vehicle manufacturer include
coolant (glycol solution), pumps, and a hot water
shut-offvalve(SeeFigure1-11).
Engine coolant is circulated through the heating
circuit by the engine and/or auxiliary water pump.
When th e heat valve is open ed, engine coolant flows
through the heater coil. Heat is transferred from the
glycol flowing in the tubes to the air flowing over the
tubes. The heater tubes have aluminum fins to
increase heat transfer from the glycol t o the air.
*AUXILIARY
HEATER
*ENGINE
*AUXILIARY
HEATER PUMP
*ENGINE
WATER PUMP
* INDICATES COMPONENTS FURNISHED
BY THE VEHICLE MANUFACTURER
*HAND VALVE
AIR BLEED
VALVE
EVAPORATOR HEATER CORE
EVAPORATOR
Figure 1-11 Heating System Flow Diagram (Typical)