Coolant leak under distributor

The first items to check when your having heater problems is the antifreeze levels in both your radiator and your over flow tank. If the antifreeze is low then fill both your radiator and your overflow tank to the full line. A low cooling system will affect your cars heater when it is being used.

Check the engine coolant when the car is cold. It is under pressure when engine is hot.
If the levels are very low you need to have it checked for leaks.

When your engine coolant level gets low the heater core is omitted form the loop to ensure the engine has the needed coolant as long as possible. But it would appear you figured out the issue, fix the coolant leak, and resolve the issue.

I'm not sure what your "ac drain tube" is, but it is possible that the coolant is what drained out the night before. This means that the coolant is hot. Hot coolant expands and will overflow if the radiator is full to begin with. Most cars provide a coolant reservoir to capture this overflow - and to which to add coolant. If your car has this reservoir, you should maintain the level for HOT or COLD (do not fill to the top)depending on whether the engine is cold or hot. If the coolant level in the reservoir is between the HOT and COLD marks, (not up to the top) and you're seeing coolant on the ground, you have a leak somehwere. A heater core that is leaking usually shows up INSIDE the car - on the floor for the front passenger - directly below the dashboard; as this is where it is located.

A puddle under the car should give an idea as to where the leak originates. Arrange to park on top of a sheet of cardboard so that any leak will drip onto it. Check it later in the day or the next morning prior to starting and driving off. If dry, reposition the cardboard under the car again, and start the engine and drive off the cardboard. Park and retrieve the cardboard and inspect for wat spots. In either case, if water is found, you can use the cardboard to approximate the location of the leak. Bear in mind that the leak could drip onto a part - and floow the part to a low point before dripping on the cardboard.

Some of the underhood A/C components will drip condensate if they are running in hot, humid conditions. This is normal. Condensate is simply water and is odorless and colorless. Coolant, on the other hand - is slightly thicker than water and is usually yellow-green or pink in color and has a slightly sweet smell. Coolant has lubricating qualities too, so it will be slippery. You will probably not be able to tell the difference between the two by looking at it is on asphalt; but touching it with fingers and looking for color & smell will.

A little coolant on the ground is nothing to worry about. Make sure that the coolant level is not dropping consistantly, and you should be ok. If it is always requiring that you add coolant, it is the sign of a leak somewhere.

Good luck!

COOLANT-ADDING ADDITIONAL
Do not remove radiator cap to add coolant to system. When adding coolant to maintain correct level, do so at coolant reserve/overflow tank. Use a 50/50 mixture of ethylene glycol antifreeze containing Alugard 340-2 y and low mineral content water.
Remove radiator cap only for testing or when refilling system after service. Removing cap unnecessarily can cause loss of coolant and allow air to enter system, which produces corrosion.

COOLANT LEVEL CHECK
The cooling system is closed and designed to maintain coolant level to top of radiator.
WARNING: DO NOT OPEN RADIATOR DRAINCOCK WITH ENGINE RUNNING OR WHILE ENGINE IS HOT AND COOLING SYSTEM IS UNDER PRESSURE.
Remove radiator cap. The coolant level should be to top of radiator. If not, and if coolant level in coolant recovery bottle is at ADD mark, check for:

• An air leak in coolant reserve/overflow tank or its hose
• An air leak in radiator filler neck
• Leak in pressure cap seal to radiator filler neck

TRANSMISSION and OIL LEVEL CHECK TUBES


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Check the coolant reservoir and the radiator for proper coolant level. If low you probably have a leaking intake gasket or possibly a head gasket leak. The intake leak will be visible on either end of the intake manifold, located at the very top portion of the engine. The head gasket usually shows up at the rear head, nearest the belt. You could have a water pump leaking and this would show coolant on the ground under the right front of the engine, more so when the engine is running. They are very common for all 3 problems.

There may be a thermostat problem, but your symtoms indicate low coolant level. When coolant is too low, it will not circulate, so you get no heat in car, and the coolant remaining in engine block overheats because no cool fluid coming in.
You need to fill the system up properly then look for leaks.
With cold engine, open radiator cap. Fill with antifreeze directly in radiator. Start engine, top up rad if level drops. Put heat control on Hot. Fan on low, heat on high. Gently rev engine and top up rad as needed. IF as engine heats up, it starts kicking fuild violently out of radiator, then the thermostat is bad. if not, then recap radiator, top up overflow bottle and you're done. Look under car for any sign of leaks. Steady dripping indicates a leak, then address that.

If you dont have an external coolant leak anywhere under your hood that has shown up on your driveway it could be the intake manifold or the headgasket leaking. Also check the thermostate to solve the heat issue.

It means your radiator is low on coolant. Not a good thing to leave go. There should be a reservoir under the hood that you put the coolant into. Chances are it has a hot and cold fill level. Check your manual to see if you should use 50/50 coolant or full strength. Fill it to the cold fill level. Drive the car as usual and check it again after a day. It may need to be topped off as some of the coolant will have made it's way into the radiator and coolant stream. It is usual for some of the coolant to evaporate over time so it isn't anything to worry about unless it starts happening regularly. Good luck.

No heat is often a symptom of low coolant, usually followed by overheat. There are other controls that regulate heater, but right now, re-fill the cooling system with engine running and heater on high, then check for leaks (coolant you lost went somewhere...you need to determine where) Low coolant will damage your engine. Take care of that first, then if heater still does not work, then do diagnosis on that. (if you loose the engine heat won't matter, will it!)

From what you have posted, it sounds like your coolant level is low. With engine cold, re-fill the system, then check carefully for leaks. One leak has been located you can take necessary steps to correct it.
Generally the reason for your problem symptoms is that the coolant level has dropped below the level of the cylinder head. This can cause the head to overheat and warp, bloww a head gasket, or both! (both substantial $ to repair) DO NOT drive vehicle with this condition, till you have found and corrected the problem!!!
Good Luck!!