Is it permissible to pray Isha by tayammum, while sitting, and without knowing the qibla, due to the inability to use water and exit the car?

Your prayer is invalid for several reasons: you prayed with tayammum (definition) without seeking water, you prayed sitting while standing is a pillar that is only waived due to inability, and you did not ascertain the direction of the Qibla (definition), which is a condition for the validity of prayer. You could have asked about the Qibla in the city. You must repeat the 'Isha prayer.