Black Pepper is not good for your engine or radiator, so you should just get it fixed instead of taking the chance to mess up your engine.
What You Should do is get it fixed right away. Fix it the right way by getting it fixed by a professional because putting black pepper in it could make more of a disaster.
How you repair a radiator depends on what is wrong with it. A small leak may be able to be fixed by adding a stop-leak product, available at most discount stores and auto repair retailers. Depending on the problem, the radiator may have to be pulled from the vehicle for inspection. Minor damaged can perhaps be fixed with a stop-leak product or a small spot weld if the radiator is copper or brass. Aluminum radiators (newer models) can sometimes be repaired with epoxy.
Most Likely you have a leak from the transmission cooling tank on your radiator to the antifreeze portion of the radiator. Jeff
Standing vacuum test
Standing vacuum test
Standing vacuum test
In many cases, yes. One of the many radiator "stop-leak" products, put into the radiator will normally do the job.Follow the manufacturer's instructions and add the stop-leak product, turn the heater on and set it to it's hottest of settings. Doing so will open the heater control valve, allow the maximum amount of radiator water to reach the heater coreand let the stop-leak product to do its work.The way most of these products work is, they cool and solidify when they reach the leak and are suddenly exposed to cooler air. Just don't forget to turn the heater on- if the control valve won't allow the heated radiator contents to get to the heater core, it won't do any good.Stop leak products sometimes do more harm than good. They can clog thermostats or reduce efficiency of radiator by reducing heat transfer ability. A quick fix is bypassing. Simply connect the two hoses together.
Most common is a faulty return hose at the radiator. This in most cases is cover by warranty
Radiator or hoses. Possible water pump
Most transmissions are cooled using separate tubs in your radiator, if this tube develops a leak it could mix with your antifreeze, you need a new radiator...
On most cars if they don't have a radiator cap, then you can put it in the cooling system by pouring it in through the upper radiator hose. Even if you are suppose to do this while engine is hot DO NOT because it will have the same affect as pulling the radiator cap while hot.
Most of the "stop leak" products turn your antifreeze black. It's very likely someone used stop leak in your car.
It is very doubtful that it is smoke. It is most likely steam. Either there is a pinhole leak in the radiator allowing hot coolant to escape that then vaporizes into steam when it hits the atmosphere... or there is something spilled on the radiator that steams when the radiator gets hot. Have the radiator pressure tested for leaks.