Overheating replaced all but the water pump-what else can it be for an overheating problem

Also get your friend to flush the system if it hasn't been done in awhile . I regularly get older rigs in that have issues with their breaks and cooling systems. Both need to be flushed every ten years min. Or you'll end up with failing systems.

Connie, Were the radiator,water pump and thermostat replaced to try and fix the over heat issue or as maintenance. Engine overheating can be caused by a lot of things, Leak in cooling system, air in system, bad rad. cap, slipping belt, faulty thermostat or installed upside down, faulty water pump, plugged radiator (inside/outside), collapsing rad hose, faulty cooling fan, leaking head gasket, sludge plugging engine water passages, poorly tuned engine, etc..
Take into a good shop for diagnoses and estimate for repair. Check the attached links,instruction and guides, Good luck
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How to Troubleshoot an Overheating Engine
Steve Litt Overheating Guide
Diagnose Engine Overheating Auto Repair Help
How to Troubleshoot an Overheating Engine DoItYourself com

overheating sound like faulty thermostat.thermostat either sticking close or could have blown headgasket if you see a lot of white smoke coming out of exhaust.if headgasket is leaking check engine oil should look milky.also check water pump look around weep hole or see coolant leaking around water pump replace water pump.also check water pump drive belt.make sure drive belt not loose slipping.

the power steering pump would have nothing to do with the engine overheating but the water pump certainly would, but before you go to the trouble of replacing the water pump you need to be certain that is the problem as there are other issues that can cause overheating, like the thermostat or a blocked radiator, the mechanic who said it was the power steering pump quiet obviously don't know too much about engines............hope this helps......cheers.

You say "Water pump thermostat" do you mean Thermostat or water pump? If you replaced the thermostat and still have an overheating problem then look at the water pump itself as the problem if that is replaced and you still have the problem then you have another problem in the engine or a clogged radiator core. You may have a lubrication problem in the motor, if the oil pump went out or your low on oil then the engine may be overheating from lack of lubrication. Another thing that will cause overheating is if the Fan is Electric and not activating or if the radiator fan is mechanical the clutch is not allowing the fan to rotate free when you are driving.

If your car is leaking coolant from the water pump. Replace the water pump. If not replace thermostat first. It is the cheapest out of the 2.

water pump is the problem,you will find the the water pump impellor has broken or come loose from the shaft,you going to have to replace the water pump

your heat is not working becuase the coolant level is too low meaning your heater core is full of air. the reason your car overheated is because the water pump impeller splines are gone and you need to replace the water pump. it is driven by the timing belt so replace that too. and the tensioner. this is the number one cause of vw overheating, especially on a diesel. i have replaced about 50 water pumps on this engine because of this.

i would change the water pump and check for plugs in the heater core

The year of the vehicle, rusty liquid, and overheating, says your radiator could use a replacement. If it was your water pump, you would have liquid coming out of the water pump itself.