Bleed Hole Inspection; System Pressure Test; Radiator Cap Pressure Test - Polaris Trail Blazer Service Manual

WARNING: Never remove radiator cap when engine is warm or hot. The cooling system is under pressure and
serious burns may result. Allow the engine and cooling system to cool before servicing.
FLOW
Radiator
Thermostat
(4 Cycle Only)
Cylinder
Head

Bleed Hole Inspection

When coolant is added, air is purged through a bleed hole at the top between the two halves (see illustration
above). If there is difficulty bleeding the cooling system or if overheating problems are encountered, remove
the radiator cap and inspect to see if the bleed hole is clear.
Polaris Sales Inc.
Locate hole (about 1.5mm diameter)
on inside of radiator below filler neck.
Hole must be clear to allow ease of
bleeding the system.
Water
Pump
Fan Switch Location
Cylinder

System Pressure Test

1. Remove radiator cap access panel from front
2. Remove recovery bottle hose from radiator.
3. Connect a Mity Vac™ (PN 2870975) to
Pressure test
here with cap
in place

Radiator Cap Pressure Test

1. Remove radiator cap and test using a cap
2. The radiator cap relief pressure is 13 lbs. for all
3.9
Cooling System
Forward
Vent hole inside cap
liner must be clear.
of headlamp housing.
radiator and pressurize system to 10 PSI. The
system must retain 10 lbs of pressure for five
minutes or longer. If pressure loss is evident
within five minutes, check radiator, all cooling
system hoses and clamps, or water pump
seal.
tester (commercially available).
models.
ENGINE
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