How are Power Steering System Fluid Cooler issues diagnosed?
When the power steering pump makes noises to the effect of those stated under syptoms, the first thing a technician will do is check the fluid level, and check for leaks. If the cooler and lines are leaking, they will be replaced. Secondly, a check engine light, power steering fluid temperature warning lamp, or power steering system warning lamp is displayed, reading the codes may help the technician narrow the issue to the power steering cooler, especially if the power steering pump is making noise. The power steering fluid cooler will be examined, and the fins may be cleaned and straightened as a diagnostic measure. Next, if low flow is detected, the technician may remove and backflush the cooler, pressure test the cooler, or check system pressures before and after the power steering fluid cooler. This will show where pressure is lost, and where restriction exists in the system.
How are Power Steering System Fluid Coolers replaced?
Replacing the power steering fluid cooler involves removing the mounting hardware or fasteners, disconnecting the two lines from the cooler, and installing the new cooler assembly in its place. Afterwards, the power steering system will be flushed, drained and refilled with clean power steering fluid. If the power steering fluid cooler is part of the vehicle's radiator, the engine cooling system would be drained, radiator removed, and the cooling system would be refilled and bled after the repair is complete. Lastly, the technician would bleed the power steering system, drive the vehicle, monitor power steering system pressure and temperature, and possibly manually clear the OBD trouble codes before confirming the repair.
RepairPal Recommendations for Power Steering System Fluid Cooler issues
Bypassing or removing the power steering fluid cooling system is not recommended, as this is more of a hindrance to proper operation than a repair. In an emergency, looping past the oil cooler, and back to the power steering reservoir is ok, but no strenuous driving should take place as this may cause additional damage.