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The charge air bypass valve is a vacuum/electrically operated solenoid valve that is attached to the supercharger housing.
The three-way valve is controlled by the engine control module (ECM). The ECM determines when pressure from the
manifold is routed to the bypass actuator. The charge air bypass valve allows pressure from the manifold to open the bypass
valve and lower boost pressure during specific driving conditions. The open bypass valve reduces the pumping effort of the
supercharger, thereby increasing the fuel efficiency in light load operations.
Powertrain Cooling
Coolant Type
40/60 coolant/water mixture of clean, drinkable water and use only DEX-COOL® Coolant.
Engine Cooling System
A surge tank is recommended for removing air from the engine coolant, but as long as the radiator or surge tank is the
highest point in the system, then air will be evacuated from the coolant. The highest point, meaning that either the radiator
or the surge tank have a portion higher than the top of the cylinder heads. If they are not, then air can be trapped within the
cylinder heads and cause portions of the cylinder heads to overheat, which will be detrimental to engine performance and
longevity. Coolant is drawn from the radiator outlet and into the water pump inlet by the water pump. Some coolant will then
be pumped from the water pump, to the heater core, then back to the water pump. This provides the passenger compartment
with heat and defrost. Coolant is also pumped through the water pump outlet and into the engine block. In the engine block,
the coolant circulates through the water jackets surrounding the cylinders where it absorbs heat.
The cylinder head air bleed needs to be routed to the highest point in the cooling system. This will assist in removing air from
the cylinder heads (Figure. 1).
Fig. 1
PUMP OUTLET
PUMP INLET
Hose 22768503 can be purchase to obtain the heater inlet/outlet quick connects, when creating a custom installation (Figure
2).
Fig. 2
HEATER HOSE ASSEMBLY
LT4 Engine Installation
TITLE
CYLINDER HEAD AIR BLEED
19332703
IR 12AU15
PART NO.
5
40
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