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What kind of valve? Exhaust valve? EGR valve? PCV valve?
in the valve body in transmission pan
its the PCV valve
You lift the hood and look at the pressure gauge.
The PCV,Positive Crankcase Ventilation Valve is to keep down crankcase pressure by way of venting the engine. Freon is the refrigerant that allows an air conditioner to cool properly. There is not any connection between the two.
Low fuel pressure, bad IAC valve, vacuum leak, bad injector(s). You also need to check the EGR valve.
Your Prizm may not have one. Check the valve cover or the intake valve cover on twin cam For a vacuum hose leading to the intake. The PCV should be installed in the cover with hose connected. If cover only has tubing permanently mounted then you vehicle has no PCV valve.
The low pressure valve on a 93 Chevy Corsica is under the hood. It is on the larger hose coming off the AC air compressor.
Low pressure valve.
since check valve holds water in the line can a hand pump be installed between the check valve and water tank?
Check the valve cover gasket, if not that you may have a warped head.
Check valve