Coolant Filler Pressure Cap

With this type of system if the radiator has a cap it will be a non vented cap.

Coolant filler pressure cap.

If there is no pressure in the cooling system the coolant will boil off. The expansion tank will have the vented cap in case the pressure exceeds the expansion tank s capacity. On the other hand if the pressure was allowed to increase above 16 psi the cooling system including the hoses and. Coolant level just above minimum so i filled up a cup of water worth to get it back to max after a 30 mile trip checked coolant next morning and the level dropped back to just above minimum.

Radiator caps are critical to catch coolant overflow keeping your engine cooling system operating at optimal pressure and temperature and your vehicle operating at optimal performance. But they do a lot more than just that. Most radiator pressure caps keep the system pressure at 16 psi so the engine coolant can get considerably hotter without the fear that it will boil off. The purpose of this document is to provide dimensions for the different pressure ratings of boyonet type radiator pressure caps and filler necks.

When the pressure reaches 15 psi the pressure pushes the valve open allowing coolant to escape from the cooling system. 1 08 3 11 plastic cap threaded. Plastic cap threaded. They are simply conditions of the cooling systems capability the ambient air temperature and air flow.

Car mk4 golf 2002 tdi i experienced water loss over a short period e g. Gates manufactures our oe quality radiator caps and cool control caps for your heavy duty vehicle applications with a selection of durable wear resistant radiator caps for automotive applications without. Remember none of the above running temperatures have anything to do with the cap rating. In this case a catch can or overflow can be used with the expansion tank to recapture expelled coolant.

2 36 surge tank cap. 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. Click product link for more information. If the pressure is not constant your vehicle could run the risk of overheating.

The radiator pressure cap is a two valve part that holds coolant and keeps the radiator system pressurized. Click product link for more information. Hi all just after bit of advise after replacing coolant cap. The loss of coolant would eventually fill the radiator with air and the temperature would rise even higher.

The cap is the only place where this pressure can escape so the setting of the spring on the cap determines the maximum pressure in the cooling system. The radiator cap and expansion tank cap make sure the filling hole of the radiator and expansion tank are sealed off gastight. Typically the pressure found inside the radiator is 16 pounds per square inch and the radiator cap is the piece that controls that pressure.