It is unlikely that a court would allow complete loss of contact with your children. The court's first preference is to assure a continued relationship of both parents with the children. The fact he is refusing to allow you access may be a negative in any custody proceeding for your spouse.
In order to preserver your financial and custody rights you will need to file for divorce. Part of the process is the establishment of spousal support, custody, and child support. The divorce process will include interim orders (orders during the pendency of the divorce) where you will be entitled to custody or visitation with the children. The court will do a preliminary allocation of property which can include a vehicle.
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