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Loose coolant reservoir cap.
Start pumping air into the system until the tester gauge reads the system pressure as indicated on the radiator cap.
The radiator cap and expansion tank cap make sure the filling hole of the radiator and expansion tank are sealed off gastight.
Caps are designed to ensure that the prescribed pressure on the cooling system is maintained at all times during operation by allowing air to escape in case of overpressure.
Depending on the vehicle it may or may not have the ability to give codes.
When the engine is cold the pressure of the cooling system is low and more coolant is required and.
The coolant reservoir is the plastic reservoir mounted in the engine bay that stores the coolant for the engine.
With the engine cool remove the radiator cap and attach the tester hose to the radiator neck or the coolant recovery tank depending on your particular vehicle model.
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Autokay coolant overflow reservoir tank cap radiator reservoir cap for nissan infiniti 21712 79900 yellow.
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While you re in there check to make sure your coolant overflow tank is working properly.
4 8 out of 5 stars 44.
System pressure is usually 14 or 15 psi.
Coolant goes into the reservoir tank as it expands.
The radiator cap releases the extra pressure by sending some coolant into the overflow tank.
A loose radiator cap will cause the system not to pressurize resulting in overheating.
But they do a lot more than just that.