Coolant leak close to firewall from 90 degree rubber elbow. 93 pontiac 2.3 liter. It looks like there is a hose missing. Is this an overflow or am I missing a hose? If I am where does it lead?

Thats very strange it could be meant to flush heater core keep it pluged and continue monitering. Good luck

heater core leaking coolant

Trace the 2 water hoses going into the firewall from the engine. Remove 1 and measure the inside diameter, most but not all GM heater hose is 1/2 inch. Go to the hardware store and get a plastic 90 degree plumbing elbow the same size and a couple screw hose clamps. Remove the heater hose from the firewall and connect them to the elbow with the hose clamps. Make sure they can't rub on the exhaust manifold and top up the rad and you are good. Hope this helps.

I would start by replacing that section of hose. Depending on how much it's leaking it could be the source of the engine overheating as well. After it replaced make sure coolant level is where it's supposed to be. Hope this helps

If the leak looks like it's coming out the 90 degree black rubber elbow then, this is a common problem.

check out

http://www.hotrodders.com/forum/coolant-leak-y2k-impala-169816.html

The evaporator drain is plugged with debris and filling up the heater case. Remove the 90 degree elbow and clear the drain hole at the case.(pencil or piece of wire) You will know that's it when it dumps out a half gallon on the floor. Be sure to reinstall the elbow to keep out rain/ road spray.

That drain line is for the box that holds the air conditioner evaporator and the heater coil. It seems that your heater coil has sprung a leak and the leaked fluid is coming out the drain. You have to replace the heater coil, which on most cars involves removing a lot of the interior equipment, including the dash board on many cars. A job best left for the repair shop unless you're very adventurous and patient. Even then you will have to take it to a shop to have the air conditioning system recharged.

The hose you are referring to is the drain from the heater box...gets rid of condensation from the a.c. don't connect it to anything. But, If any antifreeze (not plain water) is coming out of there, then you likely have a heater core leak. That said, if the engine is not running hot and you aren't loosing antifreeze, the level sensor in the tank is bad.

A rubber elbow coming out of the firewall is probably the a/c evaporator drain. However, the heater core could be leaking and entering the evaporator case and coming out of that drain. Are you sure coolant is coming out of that elbow and not plain water?

That hose is the drain hose for the air conditioner evaporator. If it is leaking coolant, there's a good chance that your heater core is leaking, as it is in the same 'box' that the air conditioner evaporator is in. You'll need to replace the heater core.