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Open the engine hood by pulling the hood release latch located on the lower kick panel on the driver's side of the Volvo S40. Lift the hood up and prop it on the hood prop.
Locate the steering shaft that extends from the firewall to lower suspension located inside the engine compartment, by the front right wheel. Halfway down the shaft, you will locate the power steering pump. The pump is a black container that bolts to the driver's side of the engine block. On the top, you will find a cap that says "Power Steering Fluid."
Look to the left of the cap. Bolted to the power steering pump is the thermostat temperature sensor. The sensor has a black round cap and a black wire extending out of the top.
1. Power steering fluid DOES need changing because it deteriorates with time and use.
2. You use exactly the fluid type and spec which is specified in the owner's manual . The type of PS fluid to be used depends on the type of PS system fitted to your particular car. These systems can be and are changed during a model run .
3. The fluid you have in the car is red because it is Automatic Transmission Fluid (ATF). Only use the type of ATF specified in the manual. For example if it states use ATF Dexron III or if it states Mobil ATF 3309 or another type only use that spec ATF. (I believe you will have Dexron III product in the car now and it will be the non-synthetic type).
4. You can refresh the PS fluid over time yourself by sucking out some fluid from the reservoir and adding fresh fluid. It is easy to pump out fluid using the pump fitting removed from a plastic trigger spray bottle. Just unscrew the spray nozzle from the tip of the trigger unit before you use it to pump out fluid. Remove and add fluid to the reservoir 5 or 6 times or more over a couple of weeks and you will eventually renew most of the PS fluid. Do not remove fluid once it drops to the level of the top of the top hose connected to the reservoir and then just top up each time to the correct level in the reservoir. It's really that easy.
PLACE PLASTIC BAG OVER ALTERNATOR TO KEEP FROM GETTING POWER STEERING FLUID IN IT.WILL DAMAGE IT.USE A SIPHON REMOVE ALL POWER STEERING FLUID IN PUMP RESERVOIR.THEN REMOVE REMOVE BOTH POWER STEERING HOSES CATCH WHAT FLUID LEFT IN THE POWER STEERING PUMP IN A DRAIN PAN UNDERNEATH THE VECHICLE TRY NOT TO GET POWER STEERING FLUID ON CAR PAINT IT WILL REMOVE CAR PAINT.AND POWER STEERING FLUID IS DANGEROUS.ITS A NEW KIND TRY NOT TO GET ANY ON SKIN OR CLOTHES WEAR LATEX GLOVES WHEN HANDLING IT.
Yes, You can but do not use Power steering fluid as transmission fluid. It is recommended that you use powersteering fluid in the p/s system but in a small "dose" the transmission fluid is an acceptable alternative.
If the hose clamps onto the rack & pinion,get a new clamp (replace the hose too,its probably worn)Reinstall it.fill the p/s resovoir,start the car (when the fluid gets low,add more fluid)It will make moaning noises.Just make sure the new hose isnt leaking.Turn the steering wheel back & forth a few times,top off the fluid,turn the wheel again,you should be ok.If the hose bolts on to the pump,you will need to change the hose with a wrench.(fluid replacement is the same way.