Cooling System Cap, Coolant Reserve Tank Construction - Mazda RX-8 2004 Service Highlights

COOLING SYSTEM CAP, COOLANT RESERVE TANK CONSTRUCTION

• A low-pressure type cap has been adopted for the cooling system cap. It is installed on the coolant reserve
tank to improve serviceability when adding engine coolant and bleeding air.
• A degassing type coolant reserve tank has been adopted, to integrate the simple airtight sub-tank and the air/
water separating tank, improving the air/water separating function. The integrated and large-size degassing
tank consists of a labyrinth structure with internal barriers to lengthen the distance to the outlet and reduce the
flow speed to lengthen the time the engine coolant has to accumulate, improving the air/water separation
function.
• An orifice has been adopted inside the coolant reserve outlet hose. The orifice minimizes the inner tube space
and controls the engine coolant amount to stabilize the engine coolant pressure properly when the engine
output is high.
• A coolant level switch has been adopted on the side of the coolant reserve tank. A warning light in the
instrument cluster illuminates when the engine coolant is below the specified amount.
COOLANT RESERVE TANK EXTERNAL VIEW
FRONT
RADIATOR
BARRIER
End Of Sie
COOLING SYSTEM
COOLING SYSTEM CAP
A
COOLANT
RESERVE TANK
ATOMOSPHERIC
DISCHARGE
SEC. A-A' (LABYRINTH STRUCTURE)
COOLANT FLOW
RADIATOR
COOLANT RESERVE TANK SIDE VIEW
CAP PRESSURE
FRONT
ORFICE
WATER
PUMP
THERMOSTAT
CHU011201008S04
01–12
FRONT
THERMOSTAT
COOLANT
A' LEVEL
SWITCH
WATER
PUMP
CHU0112S007
01–12–3