The Frick Car and Carriage Museum is interesting and fun. They play very informative short films in a screening room and the docents there are very friendly, helpful people. The Car and Carriage Museum is very well worth going to. And the amazing part is that is free.
The Frick Art Museum is not really that interesting or great. There is hardly anything of note. As far as I can see, Helen Frick had way more money than taste and money can't buy you taste. When J.P. Morgan died, he donated his entire art collection to the Met in New York. However the Met did not want everything. Helen Frick bought many pieces that the Met had already passed on, with good reason. Of course not all of the Frick Art collection consists of the Met's castoffs. There many portraits of insignificant nobility done by French court painters who had little talent. Just bec. art is old or expensive, doesn't mean it's really any good. It's a good thing this museum is free.