Ground locations

[Yenzlo]

I can't seem to make out where the main body grounds are in the pictures I've seen. Could anyone help me find the grounds that could be causing my ac and heater pod to mess up?

[DCaff300ZX]

They should be somewhere at the chassis and honestly, only matters if tests performed indicate the loss of ground and which further tests indicate is the most likely possibility as there are a myriad of things involved in the dash of the Z32. Generally things are not so simple and cut and dried as to where we can give a simple answer to such issues as you describe, unless there's been something obvious to consider such as butchered wiring, installs, etc.
The fsm is your friend- I took a quick look and in the HA73 section are some of the tests to determine issues with the A/C system and controls, and more detective work will get you into the areas necessary for your other issues.