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Have charging system checked. Especially the alternator.
If it is a blend door issue, you will probably have to change the faulty actuator. This is the heater blend door actuator for your Savana http://www.autozone.com/1/products/68452-a-c-heater-blend-door-actuator-dorman-604-106.html
Agree with pushrod. Sounds as the thermostat is failing in one direction but not the other. The thermo will go full open but can't retract as much as it should to maintain operating temp. That's why it isn't overheating. It is not failing in the mostly closed position. Another possibility is a faulty engine coolant temp. sensor.
Check for a vacuum leak on one of the air intake lines.
Listen to answer #1
Sounds like the same issue. Get charging system tested, especially the alternator.
Hope this helps you : http://www.ehow.com/how_7739650_replace-shift-cable-chevy.html
The lock mechanism may be rust freezing due to lack of use. Probably just needs lubed completely from the inside. (You would have to remove the interior panel to do this.)
Here you go : https://search.yahoo.com/search;_ylt=AsKRPOvQD7XYBNvERhuk092bvZx4?p=how+to+replace+1999+mercedes-benz+e430+blower+motor+resistor&toggle=1&cop=mss&ei=UTF-8&ilc=14&fr=yfp-t-103&fp=1 just copy and paste and bring up the first video. :)
Try this : http://www.justanswer.com/subaru/4left-subaru-impreza-1993-subaru-impreza-1-8l-replaced.html