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There is a heater control valve on the 1999 Ford Ranger. There is no thermal vacuum valve on this year of the vehicle.
on the side of the valve cover on the drives side.
This part is located behind the driver's rear wheel, just above and to the right of the evaporator canister if you email me at lupro1@aol.com and I will send you drawings and photo of the part.
There is no heater control valve on this generation of dodges like there used to be... the water flows constantly through the heater valve.. the only control is a trap door that allows cab air to be run through the heater core and is controlled by a vacuum solenoid in the heater box.. the temp control is also vacuum operated but be sure to check the vacuum supply line coming in from the engine.... it has a check valve in it that can be keeping the controls from getting enough vacuum to operate properly.. if you don't have a mighty vac just get one of those packs of barbed vacuum fittings from your local shucks and bypass the valve temporarily and see if you get heat... hope this helps
in between the intake manifold, bottom half.
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 holes is called the bypass holes I had the same thing happened to my alero
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.
The coolant air bleed valve is located on the top of the thermostat bypass pipe/heater pipe assembly. Close the valve once a continuous stream of coolant is expelled from the valve.
on top of the manifold. you access it by removing the dog house