Carseat Inspections
Many hospitals and police/fire stations have personnel certified (and insured) to do inspections. A call to the nearest one is probably the first step.
There are some lists of certified technicians and fitting stations if you click the "Links" or "FAQ" links at the top of the page. Or, please post your zipcode, and I can do the search for you.
Please let us know the results of your checkup! If you like, please post the model of your carseat and vehicle, and the age and weight of your child. Feel free to post your concerns about your installation, and someone may have some tips you can try before you take the carseat for an inspection. The FAQ is also a good resource and answers many common questions.