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The Vacuum switching valve controls the EGR Valve.
If there is no drain valve at the radiator you can drain the system at the drain valve on the boiler
Hmmm, do you possibly mean the back wash valve on the filter? This valve has many positions to choose from especially for sand filters. Filter, back wash, drain, drain to waste, filter bypass, closed. They are pretty much self explanatory. Normal position would be the "filter" position while the pump is running and the filter is working. Ken
If the tank, shut the water off and drain with a hose on the drain faucet on the bottom of the tank. The pressure relief valve can be replaced (however a PRV is meant to drip, it has to expand.), so can vacuum breakers and the TP valve.
There should be a drain valve where you can hook up a hose and then open the valve to drain.
The heater control valve is used to shut off hot coolant from entering the core when the heater is in the off position. A heater control valve can be actuated by either a vacuum line or a cable from the vacuum heater control valve to the heater core. This hose should be warm; if not the heater control valve is stuck and needs to be replaced
If your EGR valve is vacuum operated, simply remove the vacuum hose from the valve.
The fuel filter is on the very top center of the motor, under a plastic cover. It has a drain valve that is used in filter replacement. The valve might have been bumped slightly to the drain position or the valve seal might be bad.
The easiest way is to remove the fuel line from the fuel shut off valve and then use another piece of fuel line to route it into a gas can. Turn the valve to the reserve position and drain the tank.
evap vacuum cut valve bypass valve
how does the 83 tercel thermostatic vacuum switching valve work
There is a 1 way vacuum check valve in the eng compartment it is either disconnected or the valve is bad. comes of of the brake booster,thin vacuum line that goes into the vehical