Сooling Circuit; Сhecking For Leaks; Cooling Circuit Checking For Leaks - Winnebago 1987-1989 LeSharo Service Manual

COOLING CIRCUIT
CHECKING FOR LEAKS
Install the cap from pressure tester Ms. 554-03 in
place of the coolant bottle cap.
• Connect pressure tester Ms. 554-03 to this cap.
• Open the heater valve.
• Run the engine to warm it up then switch off.
• Pump tester to pressurize the circuit. Stop
pumping when the gauge indicates 1.6 bar (23 psi)
(red zone limit) which is 0.4 bar (6 psi) over the
calibration of the valve.
• The pressure should remain steady; if it does not,
locate and repair the leak.
• Decompress the cooling circuit by gradually
unscrewing the union on the pressure tester. Then
remove the cap adapter and replace the expansion
bottle cap after checking its pressure release value
as described on the following page.
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