There is a heater control valve on the 1999 Ford Ranger. There is no thermal vacuum valve on this year of the vehicle.
A vacuum operated daiphram valve located on top of the fuel rail
A vacuum leak on a 1999 Ford Ranger can be located using an automotive stethoscope. It can then be move around the engine to detect the sucking noise of a leak.
The 1999 Ford Ranger low pressure air conditioning valve can be found on the air conditioning compressor. The low pressure valve will be labeled as the low pressure port.
its right on the fuel rail.
On your 1999 Ford Ranger , 4.0 liter EFI , V6 engine : I believe the EGR valve is just to the left of your engine oil dipstick ( when you look into the engine compartment from the drivers side ) The EGR valve is lower down and has a round shaped top
in between the intake manifold, bottom half.
No , the 3.0 liter " Vulcan " V6 engine in a 1999 Ford Ranger is an ( Over Head Valve / pushrod design engine )
it goes to the purge valve in the back of your motor.
Perhaps a vacuum leak or bad vacuum check valve in power brake booster
The VSV is located on the intake manifold side of the emission control valve set.
A vacuum diagram can be obtained from the automaker dealership. Vacuum diagrams can also be obtained from most auto-parts stores.
It sounds like you have a vacuum leak from either a vacuum hose or a leak or crack in your intake. Check for hissing sounds.