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pressure is lifted from the lower sealing seat of the filler neck allowing for the pressure to subside).
With the cloth, proceed to remove the cap by pressing the cap down to allow the cams to pass over the
safety stops. Check for traces of liquid or steam around the rim of the cap and overflow tube when removing
the cap. Also, make sure the overflow bottle vents and overflow tube is open.
ROUTINE CHECKS IN THE CLOSED SYSTEM
There is no need to remove the pressure cap, coolant level can be checked in the reservoir and be added to
the reservoir. Although routine removal of the cap is not recommended, it should be replaced just as often
as open cooling systems caps or when coolant is replaced. Since the filler neck safety stops on the closed
system are steeper and higher, to remove the cap, it will be necessary to press down very hard. Do not force
off with a tool because this may damage the filler neck and/or solder joint.
During routine checks also check the gasket, making sure it has not deteriorated, become brittle or cracked.
Note: Pressure caps should always be tested for proper pressure release levels. Specifications require that the
cap must open below the high limit of the pressure range and must not leak below the low limit of the pressure
range.
Important: When replacing a pressure cap make sure it is of the same pressure range as the original equipment
cap.
Important: Make sure both filler neck cams are not bent or distorted in any way. This will affect the seal of the
cap, causing it to leak or hold no pressure. A bent cam will affect the seal.
If both cams are bent down to the same extent, the cap will seal but because the pressure valve spring is
compressed more - it will seal at a higher pressure. The cap will seal at a low pressure if both cams are bent
upward to the same extent. Bent cams can also cause problems during removal of the cap.
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