[Stu from NYC]

Originally Posted by retiredguy123

The only drain in the HVAC system is the condensate drain in the fan unit inside your garage. That is a white plastic pipe that you can easily verify a clog by pouring water into it. The outside HVAC unit has no water supply or drain.

Poured a quart of water down the drain and it went down quickly so not an hvac problem.

Now to figure out how to put sprinkler on now

Thanks all for help