Q: Several weeks ago I had a sealer put down on my blacktop driveway. Even though we waited for 36 hours to avoid walking on it, we now have a problem with black tar marks being tracked onto my white linoleum kitchen floor. What can I use to remove these ugly black marks, and what, if anything, can be done to prevent future tracking?

A: You should be able to remove the black marks with a dry-cleaning solvent (sold in hardware and houseware stores). If this doesn't work, then you will have to use gasoline. A good quality sealer, properly applied, should not cause the problem you describe. I would advise contacting the contractor who put it on, or the company that makes the product (if you put it on yourself). Otherwise, you may have to recoat with latex-base sealer.

Q: I have a hot water heating system with fin-type baseboard convectors. I would like to bleed the pipes to increase the heat, but I cannot find any vents on the radiators. I have tried draining the system from the pipes in the basement, but there seems to be an endless supply of water to carry upstairs. Do you have any suggestions?

A: Some hot water heating systems are of a type known as a series loop system where one pipe forms a continuous loop throughout the house with each finned convector serving merely as one part of the loop. In this system there may not be individual vents on each radiator. There may, however, be an expansion tank near the furnace that needs periodic bleeding if it gets full of water (it is supposed to be partly full of air to allow for expansion of water within the system). I suggest that you have a serviceman check this out and familiarize you with what regular maintenance is needed for your system.

Questions about home repair problems should be addressed to Bernard Gladstone in care of The New York Times Syndication Sales Corp., 200 Park Avenue, New York, N.Y. 10017. Questions of general interest will be answered in this column. Unpublished letters cannot be answered individually.