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Cooling systems on vehicles are pressurized to allow the engine to operate at more efficient (higher) temperatures. This is accomplished by fitting a radiator cap that allows the pressure to build as coolant heats up. You can check the pressure imprinted on your radiator cap to determine what the boiling point will be. At 10 psi of pressure, the boiling point of water is 240 degrees F. At 15 psi, the boiling point is 250 degrees F, and at 20 psi, the boiling point is 260 degrees F. So your engine running at 210-220 is probably within the design specifications of your engine.
DESCRIPTION
The dual radiator fans are mounted to the back side of the radiator . The radiator fan consist of the fan blade, electric motor and a support shroud which are all serviced as an assembly.
OPERATION
COOLANT TEMPERATURE A/C PRESSURETRANSAXLE OIL TEMPERATURE
Fan Operation Speeds:
Initial
Max
Initial
Max
Initial
Max
Fan On:
104°C (220°F)
110°C (230°F) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99%
1,724 Kpa (250 psi)
2,068 Kpa (300 psi) Fan Speed Duty-Cycles (Ramps-up) from 30% to 99%
96°C (204°F)
111°C (232°F) Fan Speed Duty Cycles (Ramps-up) from 30% to 99%
Fan Off:
101°C (214°F)
Fan Speed Duty-Cycles (Ramps-down) from 99% to 30%
1,710 Kpa (248 psi)
Fan Speed Duty-Cycles (Ramps-down) from 99% to 30%
89°C (192°F)
Fan Speed Duty Cycles (Ramps-down) from 99% to 30%
1988 ford ranger -years 1983-2011 ( sub catagory not stated so custom was selected )---12-16 psi
research shows that most fords run a cap operating at 16 psi with a minimum of 14 psi to a max of 18psi
go google and type in radiator pressure for ford ranger 1988 model and there are pages and catalogues for caps relating to ford
There is a slightly higher cap requirement for a diesel engine
go to your local radiator shop and they will have the correct cap for your radiator --prices $10.00 -$20.00 us depending on manufacturer
you need to rent a coolant system pressure test tool from autozone, o'reily's, or any parts store. cost is $20, you get your money back when you return tool. very easy to use, fill radiator and resorvoir with water because coolant will only be wasted til you repair leak. attach tool to radiator and pressure up to somewhere around 12-15 psi. dont exceed 15 psi. pressure coolant system and look at water pump, radiator and hoses, heater hoses, scan engine.any and all leaks will be revealed.
This hose connects the engine to the radiator. Coolant flows thru the thermostat located where the hose attaches to the engine into the radiator to cool it.
Possibly fan clutch or clogged radiator/condensor.
To check for fan clutch, hook up A/C gauges, turn a/c on watch high side gauge. 300 psi. and above run water on condensor, if psi. goes down to about 250 psi and holds. replace fan clutch.
If not, check radiator/condensor for dibris outside, and or corrosion inside the radiator.
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