I have a 2004 Benz Vaneo 1.7 Ambiente. Power Steering goes stiff when full lock either side or reversing around the corner - have to switch off. Can't find power steering fluid resevoir - help!

SOURCE: power steering rack 1998 toyota camry

I have a power steering leak on my 1998 Toyota Camry.  I have been using over the counter stop leaking fluids, but it has not helped.  It leaks more during the cold weather as oppose to hot weather. Deme 

SOURCE: stiff power steering

The power steering reservoir is between the engine and air filter intake. It looks as the image below.

SOURCE: power steering

Sounds like a bad steering rack & pinion assembly... is it only bad in one direction or both...?
If both then it's the rack assembly... Hope this helps...;-)

SOURCE: 2004 Saturn Ion - Power Steering Problem

The motor on the power steering is overheating which causes the thermal overloads to trip.

go tho the junk yard and buy a motor for a 2004 thru 206 ion or a 2004 thru 2008 chevy colbalt.

they are all the same. You may have to buy the wholle steering colum but you can remove the motor with 2 - 12mm bolts and a quick dissconnect pulg. Replace just the motor as the whole steering colum is a bit more complicated. the dealerships want you to replace the whoe steering colum, in fact that is the only way they sell the parts. It is a scam. Just the motor needs to be replaced.
I have done it on 4 different ions. try to get a motor with few as possible miles and as new as possible. I have paid between $50 and $125 for these. The dealer wants $900 fnad about $500 to install. It is very simple to do. Only 2 bolts.

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SOURCE: stiff steering

do you live in high salted areas? If so, My freestyle had the same problem. It's the joint in the steering column (you can see it from underneath the vehicle) Just keep it lubed. I had to replace mine because it had worn out. Expensive. Also, it could be the bearings on top of your front struts. Dirt gets into it and binds it up. Poor engineering designs.