I have a 92 with a 3.1 L, manual trans. I started to smell a little antifreeze once in a while a couple weeks back. Checked for visible leaks but none found. Two days ago it overheated and when I checked it was nearly out of coolant. Refilled it with coolant and now get the anti freeze smell more frequently.. Drove it 15 miles to work and it was getting close to overheating by the end of the 15 miles (gage did not get to the red but close). It died once at a stop sign and was hard to turn over (almost like a compression lock). No visible water in the oil, no water or steam out the tailpipe. Maybe some squeaking from the water pump but no leaks that I can see. Not sure if this is related but the AC quit (stopped cooling) a few weeks ago (doesn't look like it is engaging the compressor though so suspect that is a AC clutch problem or AC pressure sensor problem). Engine is a rebuilt (GM crate engine) with 60K on it.

Any ideas??? Thanks...

I started to smell a little antifreeze once in a while a couple weeks back.

the AC quit (stopped cooling) a few weeks ago (doesn't look like it is engaging the compressor though so suspect that is a AC clutch problem or AC pressure sensor problem). Engine is a rebuilt (GM crate engine) with 60K on it.

Any ideas??? Thanks...
Location of the smell of antifreeze? If inside the car, could be the heater core leaking. Pull back the front passenger carpet from the toeboard and check for moisture/antifreeze. Another heater core check would be to turn on HOT DEFrost and check for steaming of windshield. If outside from the interior, could be a steam leak, meaning coolant leaks out, but evaporates. But leaves evidence, discoloration, of a leak.

AC may have stopped working because of low freon. There is a low pressure switch and if not enough system pressure, switch is open and compressor will not kick in. You may have a small leak in this system as well, but not related to cooling system.

Welcome to the Club! Newbies buy first round.

Grab a pressure tester, fill up the radiator (only with water) and pressurize the system. You will see water as well as the pressure gauge slowly dropping as the air and water leak out of the system. This is a quick and easy way to find a leak. Also as Everett stated, check the passenger floorboard for water which indicates a leaking heater core.

Look real close at the corners of the intake manifold for signs of coolant trails. They will look like stains.