Hydraulic Cooling Fan Pump

WARNING: This page is about a different car, the 2002 Lincoln LS and 2002 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.

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

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.

CAUTION: A noisy fan system must be bled and refilled before proceeding with any of the test procedures. See HYDRAULIC COOLING FAN SYSTEM FILLING & BLEEDING under REMOVAL & INSTALLATION.

Check the cooling fan hydraulic fluid level. If necessary, add fluid. Use MERCON® Multi-Purpose Automatic Transmission Fluid XT-2-QDX.
Remove the reservoir screen and place the dial thermometer in the hydraulic cooling fan reservoir.
Start the engine and allow the engine to warm up until the fan turns on.
Allow fluid temperature to reach 165-175°F (74-80°C).
Record the flow rate and pressure readings.

NOTE: The pressure relief valve will open at 950-1150 psi (6550-7930 kPa). If the pressure is above 1,200 psi (8,275 kPa), a new pump pressure relief valve must be installed.

Turn the A/C on MAX, and record the flow and pressure readings. The flow and pressure readings should increase. If the flow and pressure readings do not increase, install a new hydraulic cooling fan pump.
Partially close the gate valve to achieve 300 psi (2,068.5 kPa). The flow rate should be 1.9-1.4 gpm. If the flow rate is less than specified, install a new hydraulic cooling fan pump.