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Are you asking or telling us it is the AIC? If that is what the code said was the problem remove it. Then check the ports for blockabe and test the motor, repair as needed or replace the AIC. If not scan the codes and post the code numbers so we can help.
Have you checked the carpet inside passenger side for wetness? Could be leaking at heater core but, Sounds like the thermostat housing was part of the issue. Don't tighten the bolts to tight on the housing it is made of plastic and could break or warp causing it to leak again. I agree with you at this point about the water pump not being the issue because it is mounted internally and would leak water into the oil pan. You need to do a cooling system pressure check and look for external leaks with that. You can also add dye to the cooling system so that the leak will show up easier. If you don't find anything this way do a compression test and look for leak at head gaskets or intake.
Gas or Diesel engine sounds like you might have a injector acting up. Maybe just dirty try a good injector cleaner and a tank of premium fuel first. Also get it scanned for codes there may be one that is pending and hasn't set yet.
Well first thing is getting the oil leak fixed, if you already know that is a problem. but shifting to 4wd isn't probably caused by the leak. Sounds more like control motor or a switch that is bad without being there to see the problem it would be had to say what your problem really is. But if you get the truck scanned for codes and then post the code numbers, we will probably be able to direct you better.
You will start getting signs of wear by noises from the timing chain. loose chain, tensioners making noise and water pump problems. Mileage is not always the factor as much as listening to the story the engine is telling. The key is don't wait when the signs start, this is a interference engine. It is much cheaper to fix before the chain jumps then after.
Try looking in the track the sunroof rides in first, for dirt and debris. Clean and remove as needed, There is a drain that the water is supposed to follow and exit the car at the bottom of the quarter panels. if these are plugged water will back up and enter your car in a way your describing. You may also be ablt to blow a little compressed air in the channels to open the drains. If your sunroof isn't closing well or the weather strips are in poor condition this my help but won't fix your problem.
Labor guide calls for 2.9hrs labor to r&r transfer case assembly. This would not include any work other just swapping old one for new one. You would need to take the labor rate charged by your local shop and times that by the 2.9 hours.
the answer given by number 1 is correct, I would just like to add to it. Not knowing why you replaced the steering column in the first place, but if it was do to worn parts. And not do to a lock and key problem you can simply change your lock cylinder from the old column to the new one.
You will need to have it scanned by someone with a scanner that will do chassis codes, body codes, transmission codes. A typical code reader won't give you these codes just general pcm codes. If you do get it scanned and can get the code numbers we will beable to help you further if needed.
Sounds like the fan speed relay is giving you the problem. This is the part that contols the speeds of the blower motor by changing the resistance or the power going to the motor. It could also be the speed control switch on the control head but the resistor is the most common problem.