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This work is targeted at assessing the influence of closing all ventilation sources of an immobile vehicle exposed to direct sunlight in the Niger-Delta region. It involves experimental methodology in which two vehicles of different capacities and tinting levels were assayed simultaneously. Temperature measurement gadgets were the instruments utilized to record temperature at various positions of the vehicles. Records were also taken for convective heat purposes near the dashboard, front windscreen, rear windscreen and back windscreens. The windows were also cracked to various lengths and the effects recorded. Results revealed different levels of temperature build-up with time, with the dashboard having the highest temperature in both cabins and the tinted rear unit showing the lowest level of temperature rise. The pin-line effect was found to apparently reduce temperature at an infinitesimal extent. However, cracking the screen to a length of 15 to 25 cm proved reasonable with respect to cabin temperature reduction in a Niger- Delta zone. This result of achieving a reasonable cracking length compares favourably with the results of other works.