Engine coolant is reaching 195 degrees and if heater is put to inside air it blows at about 130 degrees. However, as soon as I put it to outside air it starts to drop and ends at about 90 degrees. When in defrost position it automatically uses outside air, therefore the defroster blows at 90 degrees at best and is not hot enough to defrost windshield or heat the van. I believe it is in the mix door, but cannot find how to get to it. Please help

You can also check the heater hoses. The inlet hose should be almost too hot to touch, like almost as hot as the radiator hose, and the return hose will be much cooler but not too cool. You may have a partially congested heater core. The most efficiant repair for that would be to replace it but you may have some success by flushing the entire system.
What do you believe is wrong with the mix door?

When the control is on inside air, it blows about 130 degrees but when it is on outside air it blows at 90 degrees or less. Also the left outlet is much cooler than the right when outside is on. All tempertures were taken from the center outlet.

I don't know exactly how efficient the heater should be but those temps seem low. But with the difference side to side, you may have a couple problems, especially since you haven't mentioned having Dual Zone HVAC.
Recalibrating blend doors requires an appropriate scan tool capable of limited reprogramming.
You should check for DTCs before proceeding in that direction.