Hydraulic Cooling Fan Pump

WARNING: Do not touch the flowmeter during the test procedure or severe burns and serious injury may occur.

1. CAUTION: Make sure that the connection point will not interfere with any of the engine accessory drive components or drive belts.

Note: On some vehicles the port may not be easily accessible. The power steering analyzer should then be hooked up at the hydraulic cooling fan motor or at a point in the high pressure line between the motor and the hydraulic cooling fan pump.

Install the power steering analyzer at the high pressure port of the hydraulic cooling fan pump. Make sure the power steering analyzer gate is fully open.

2. CAUTION: A noisy fan system must be bled and refilled before proceeding with any of the test procedures.

Check the cooling fan hydraulic fluid level. If necessary, add fluid.
^ Use MERCON Multipurpose(ATF) Transmission Fluid XT-2-QDX meeting Ford specification MERCON or equivalent.
3. Remove the reservoir screen and place the dial thermometer in the hydraulic cooling fan reservoir.
4. Install the digital tachometer.
5. Connect the NGS Tester.
6. Start the engine and command MAX fan (2,300 ± 100 rpm).
7. Allow fluid temperature to reach 74 - 80°C (165 - 175°F).
8. Record the flow rate and pressure readings. Readings should be 900 ± 100 psi (6,205.5 ± 689.5 kPa) and 4.0 ± 0.4 gpm.
^ If the flow rate is below specification, the hydraulic cooling fan pump may need repair. Continue with the test procedure.

^ Note: The relief valve will open at 1,050 ± 100 psi.

If the pressure is above 1,200 psi (8,275 kPa), a new pump pressure relief valve must be installed.
9. Partially close the gate valve to achieve 300 psi (2,068.5 kPa). The flow rate should be 1.65 ±.25 gpm.
^ If the flow rate is less than specified, install a new hydraulic cooling fan pump.