It is not nearly as cut and dry as if it were in your name and it may not be worth his time and effort to deal with it.

Evaporative coolers function by sucking the hot dry air through filter pads of aspen or plastic mesh that are saturated with water that circulates via a pump in the cooler sump.They need twice yearly maintenance to even achieve their 5-10 year lifespan. 

Get the water out, dry it out and see if it'll run.

After a while, seeing the number of good deals dry up over the years left me disheartened but eventually I got the swing of things and took off.

HI - I'm considering buying a small condo in Manhattan but the window is facing multiple unidentified vents, seller told me it's all AC vents from 1 restaurant and 1 dry cleaner business on the ground floor. 

Hard time finding contractors to do the work, so that has caused us to have lots of vacancies in houses awaiting a plumber/electrician/dry wall contractor, etc.

I have a lot of family members who work in the construction field from Tile ( a lot of those ) , framing , foundation , roofing ,painting, and dry walls.

We are in talks to take on a 25% partner for a decent sum that would handle most of our bridge needs but it's only early stages and these things dry up and go away often, so I need to keep pushing on all fronts. 

I'll notice weeds and dry spots and address them.   

Rainfall is minimal, averaging less than a third of an inch, making it a relatively dry month.