Nissan Repair: windshield washer, windshield washer pump, oil application


Question
I have a maxima 96 SE ,90 000 miles.

I just treated my car for rust  (an oil application under the car) and now the windshield washer doesn't work , it makes no noise as it does usually , I check many fuse and find nothing abnormal, in find when I look in my user's book I didn't find a fuse specially used for the windshield washer pump, si I check most of them.
I try to find the pump but see nothing , can you tell me where it is , so I can check if the wire around are ok, it's the first time I have this problem......

Air conditionning stop working 2 weeks ago , fan is ok but the air is at the same temperature as if I have no air conditionning , is it just a problem to fill the system with new liquid ? , it's the first time it stop his good job, something I can check ?..

Sometimes the check engine light appear , at this time when the car is on idle the RPM run at 1100 , very often when it rains the light go off and the rpm back at 600 , the problem is regular for the last 2 years.... Something I can do ?, curiously it's ok for 3 weeks now

Thank's for your help who is very very helpful

Answer
Michael,

The washer pump is under the car at the front.  It could be that the coating covered the terminals.  Get under the car and check it out.  

Yes, the airconditioner needs to be charged.

Check the codes on the computer and see what keeps coming up.  Go to Autozone or the like and see what is throwing the codes.  The codes will remain in memory for something like fifty ignition cycles even after the light is off so if has not been too long you will know what was going on.